eval.c revision 259065
1145516Sdarrenr/*- 2145516Sdarrenr * Copyright (c) 1993 3145516Sdarrenr * The Regents of the University of California. All rights reserved. 4145516Sdarrenr * 5145516Sdarrenr * This code is derived from software contributed to Berkeley by 6145516Sdarrenr * Kenneth Almquist. 7145516Sdarrenr * 8145516Sdarrenr * Redistribution and use in source and binary forms, with or without 9145516Sdarrenr * modification, are permitted provided that the following conditions 10172776Sdarrenr * are met: 11145516Sdarrenr * 1. Redistributions of source code must retain the above copyright 12145516Sdarrenr * notice, this list of conditions and the following disclaimer. 13145516Sdarrenr * 2. Redistributions in binary form must reproduce the above copyright 14145516Sdarrenr * notice, this list of conditions and the following disclaimer in the 15145516Sdarrenr * documentation and/or other materials provided with the distribution. 16145516Sdarrenr * 4. Neither the name of the University nor the names of its contributors 17145516Sdarrenr * may be used to endorse or promote products derived from this software 18145516Sdarrenr * without specific prior written permission. 19145516Sdarrenr * 20145516Sdarrenr * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21145516Sdarrenr * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22145516Sdarrenr * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23145516Sdarrenr * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24145516Sdarrenr * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25145516Sdarrenr * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26145516Sdarrenr * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27145516Sdarrenr * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28145516Sdarrenr * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29145516Sdarrenr * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30145516Sdarrenr * SUCH DAMAGE. 31145516Sdarrenr */ 32145516Sdarrenr 33145516Sdarrenr#ifndef lint 34145516Sdarrenr#if 0 35145516Sdarrenrstatic char sccsid[] = "@(#)eval.c 8.9 (Berkeley) 6/8/95"; 36145516Sdarrenr#endif 37145516Sdarrenr#endif /* not lint */ 38145516Sdarrenr#include <sys/cdefs.h> 39145516Sdarrenr__FBSDID("$FreeBSD: releng/10.0/bin/sh/eval.c 255215 2013-09-04 22:10:16Z jilles $"); 40145516Sdarrenr 41145516Sdarrenr#include <paths.h> 42145516Sdarrenr#include <signal.h> 43145516Sdarrenr#include <stdlib.h> 44145516Sdarrenr#include <unistd.h> 45145516Sdarrenr#include <sys/resource.h> 46145516Sdarrenr#include <sys/wait.h> /* For WIFSIGNALED(status) */ 47145516Sdarrenr#include <errno.h> 48145516Sdarrenr 49145516Sdarrenr/* 50145516Sdarrenr * Evaluate a command. 51145516Sdarrenr */ 52145516Sdarrenr 53145516Sdarrenr#include "shell.h" 54145516Sdarrenr#include "nodes.h" 55145516Sdarrenr#include "syntax.h" 56145516Sdarrenr#include "expand.h" 57145516Sdarrenr#include "parser.h" 58145516Sdarrenr#include "jobs.h" 59145516Sdarrenr#include "eval.h" 60170268Sdarrenr#include "builtins.h" 61170268Sdarrenr#include "options.h" 62170268Sdarrenr#include "exec.h" 63170268Sdarrenr#include "redir.h" 64170268Sdarrenr#include "input.h" 65181803Sbz#include "output.h" 66181803Sbz#include "trap.h" 67181803Sbz#include "var.h" 68181803Sbz#include "memalloc.h" 69181803Sbz#include "error.h" 70181803Sbz#include "show.h" 71145516Sdarrenr#include "mystring.h" 72145516Sdarrenr#ifndef NO_HISTORY 73145516Sdarrenr#include "myhistedit.h" 74145516Sdarrenr#endif 75170268Sdarrenr 76170268Sdarrenr 77170268Sdarrenrint evalskip; /* set if we are skipping commands */ 78145516Sdarrenrint skipcount; /* number of levels to skip */ 79145516Sdarrenrstatic int loopnest; /* current loop nesting level */ 80145516Sdarrenrint funcnest; /* depth of function calls */ 81145516Sdarrenrstatic int builtin_flags; /* evalcommand flags for builtins */ 82145516Sdarrenr 83145516Sdarrenr 84145516Sdarrenrchar *commandname; 85145516Sdarrenrstruct strlist *cmdenviron; 86145516Sdarrenrint exitstatus; /* exit status of last command */ 87145516Sdarrenrint oexitstatus; /* saved exit status */ 88145516Sdarrenr 89145516Sdarrenr 90145516Sdarrenrstatic void evalloop(union node *, int); 91145516Sdarrenrstatic void evalfor(union node *, int); 92145516Sdarrenrstatic union node *evalcase(union node *); 93145516Sdarrenrstatic void evalsubshell(union node *, int); 94145516Sdarrenrstatic void evalredir(union node *, int); 95145516Sdarrenrstatic void exphere(union node *, struct arglist *); 96145516Sdarrenrstatic void expredir(union node *); 97145516Sdarrenrstatic void evalpipe(union node *); 98145516Sdarrenrstatic int is_valid_fast_cmdsubst(union node *n); 99145516Sdarrenrstatic void evalcommand(union node *, int, struct backcmd *); 100145516Sdarrenrstatic void prehash(union node *); 101145516Sdarrenr 102145516Sdarrenr 103145516Sdarrenr/* 104145516Sdarrenr * Called to reset things after an exception. 105145516Sdarrenr */ 106145516Sdarrenr 107145516Sdarrenrvoid 108145516Sdarrenrreseteval(void) 109145516Sdarrenr{ 110145516Sdarrenr evalskip = 0; 111145516Sdarrenr loopnest = 0; 112145516Sdarrenr} 113145516Sdarrenr 114145516Sdarrenr 115145516Sdarrenr/* 116145516Sdarrenr * The eval command. 117145516Sdarrenr */ 118145516Sdarrenr 119145516Sdarrenrint 120145516Sdarrenrevalcmd(int argc, char **argv) 121145516Sdarrenr{ 122145516Sdarrenr char *p; 123145516Sdarrenr char *concat; 124145516Sdarrenr char **ap; 125145516Sdarrenr 126145516Sdarrenr if (argc > 1) { 127145516Sdarrenr p = argv[1]; 128145516Sdarrenr if (argc > 2) { 129151897Srwatson STARTSTACKSTR(concat); 130145516Sdarrenr ap = argv + 2; 131145516Sdarrenr for (;;) { 132145516Sdarrenr STPUTS(p, concat); 133145516Sdarrenr if ((p = *ap++) == NULL) 134145516Sdarrenr break; 135145516Sdarrenr STPUTC(' ', concat); 136145516Sdarrenr } 137145516Sdarrenr STPUTC('\0', concat); 138145516Sdarrenr p = grabstackstr(concat); 139145516Sdarrenr } 140145516Sdarrenr evalstring(p, builtin_flags); 141145516Sdarrenr } else 142170268Sdarrenr exitstatus = 0; 143145516Sdarrenr return exitstatus; 144145516Sdarrenr} 145145516Sdarrenr 146145516Sdarrenr 147145516Sdarrenr/* 148145516Sdarrenr * Execute a command or commands contained in a string. 149145516Sdarrenr */ 150161356Sguido 151145516Sdarrenrvoid 152145516Sdarrenrevalstring(char *s, int flags) 153145516Sdarrenr{ 154145516Sdarrenr union node *n; 155145516Sdarrenr struct stackmark smark; 156145516Sdarrenr int flags_exit; 157145516Sdarrenr int any; 158145516Sdarrenr 159145516Sdarrenr flags_exit = flags & EV_EXIT; 160145516Sdarrenr flags &= ~EV_EXIT; 161145516Sdarrenr any = 0; 162145516Sdarrenr setstackmark(&smark); 163145516Sdarrenr setinputstring(s, 1); 164145516Sdarrenr while ((n = parsecmd(0)) != NEOF) { 165153876Sguido if (n != NULL && !nflag) { 166153876Sguido if (flags_exit && preadateof()) 167153876Sguido evaltree(n, flags | EV_EXIT); 168153876Sguido else 169153876Sguido evaltree(n, flags); 170153876Sguido any = 1; 171153876Sguido } 172153876Sguido popstackmark(&smark); 173153876Sguido setstackmark(&smark); 174153876Sguido } 175153876Sguido popfile(); 176153876Sguido popstackmark(&smark); 177153876Sguido if (!any) 178145516Sdarrenr exitstatus = 0; 179145516Sdarrenr if (flags_exit) 180145516Sdarrenr exraise(EXEXIT); 181145516Sdarrenr} 182145516Sdarrenr 183145516Sdarrenr 184145516Sdarrenr/* 185145516Sdarrenr * Evaluate a parse tree. The value is left in the global variable 186145516Sdarrenr * exitstatus. 187145516Sdarrenr */ 188145516Sdarrenr 189145516Sdarrenrvoid 190145516Sdarrenrevaltree(union node *n, int flags) 191145516Sdarrenr{ 192145516Sdarrenr int do_etest; 193145516Sdarrenr union node *next; 194145516Sdarrenr struct stackmark smark; 195145516Sdarrenr 196145516Sdarrenr setstackmark(&smark); 197145516Sdarrenr do_etest = 0; 198145516Sdarrenr if (n == NULL) { 199145516Sdarrenr TRACE(("evaltree(NULL) called\n")); 200145516Sdarrenr exitstatus = 0; 201145516Sdarrenr goto out; 202145516Sdarrenr } 203145516Sdarrenr do { 204145516Sdarrenr next = NULL; 205145516Sdarrenr#ifndef NO_HISTORY 206145516Sdarrenr displayhist = 1; /* show history substitutions done with fc */ 207145516Sdarrenr#endif 208145516Sdarrenr TRACE(("evaltree(%p: %d) called\n", (void *)n, n->type)); 209170268Sdarrenr switch (n->type) { 210145516Sdarrenr case NSEMI: 211145516Sdarrenr evaltree(n->nbinary.ch1, flags & ~EV_EXIT); 212145516Sdarrenr if (evalskip) 213145516Sdarrenr goto out; 214145516Sdarrenr next = n->nbinary.ch2; 215145516Sdarrenr break; 216145516Sdarrenr case NAND: 217145516Sdarrenr evaltree(n->nbinary.ch1, EV_TESTED); 218145516Sdarrenr if (evalskip || exitstatus != 0) { 219145516Sdarrenr goto out; 220145516Sdarrenr } 221145516Sdarrenr next = n->nbinary.ch2; 222145516Sdarrenr break; 223145516Sdarrenr case NOR: 224170268Sdarrenr evaltree(n->nbinary.ch1, EV_TESTED); 225145516Sdarrenr if (evalskip || exitstatus == 0) 226145516Sdarrenr goto out; 227145516Sdarrenr next = n->nbinary.ch2; 228145516Sdarrenr break; 229145516Sdarrenr case NREDIR: 230145516Sdarrenr evalredir(n, flags); 231145516Sdarrenr break; 232145516Sdarrenr case NSUBSHELL: 233145516Sdarrenr evalsubshell(n, flags); 234145516Sdarrenr do_etest = !(flags & EV_TESTED); 235145516Sdarrenr break; 236145516Sdarrenr case NBACKGND: 237145516Sdarrenr evalsubshell(n, flags); 238161356Sguido break; 239145516Sdarrenr case NIF: { 240145516Sdarrenr evaltree(n->nif.test, EV_TESTED); 241145516Sdarrenr if (evalskip) 242145516Sdarrenr goto out; 243181803Sbz if (exitstatus == 0) 244145516Sdarrenr next = n->nif.ifpart; 245145516Sdarrenr else if (n->nif.elsepart) 246145516Sdarrenr next = n->nif.elsepart; 247145516Sdarrenr else 248145516Sdarrenr exitstatus = 0; 249145516Sdarrenr break; 250145516Sdarrenr } 251145516Sdarrenr case NWHILE: 252145516Sdarrenr case NUNTIL: 253145516Sdarrenr evalloop(n, flags & ~EV_EXIT); 254145516Sdarrenr break; 255145516Sdarrenr case NFOR: 256145516Sdarrenr evalfor(n, flags & ~EV_EXIT); 257145516Sdarrenr break; 258145516Sdarrenr case NCASE: 259145516Sdarrenr next = evalcase(n); 260170268Sdarrenr break; 261145516Sdarrenr case NCLIST: 262145516Sdarrenr next = n->nclist.body; 263145516Sdarrenr break; 264145516Sdarrenr case NCLISTFALLTHRU: 265145516Sdarrenr if (n->nclist.body) { 266181803Sbz evaltree(n->nclist.body, flags & ~EV_EXIT); 267145516Sdarrenr if (evalskip) 268145516Sdarrenr goto out; 269145516Sdarrenr } 270145516Sdarrenr next = n->nclist.next; 271145516Sdarrenr break; 272145516Sdarrenr case NDEFUN: 273145516Sdarrenr defun(n->narg.text, n->narg.next); 274145516Sdarrenr exitstatus = 0; 275145516Sdarrenr break; 276145516Sdarrenr case NNOT: 277145516Sdarrenr evaltree(n->nnot.com, EV_TESTED); 278145516Sdarrenr if (evalskip) 279145516Sdarrenr goto out; 280145516Sdarrenr exitstatus = !exitstatus; 281145516Sdarrenr break; 282145516Sdarrenr 283145516Sdarrenr case NPIPE: 284145516Sdarrenr evalpipe(n); 285145516Sdarrenr do_etest = !(flags & EV_TESTED); 286145516Sdarrenr break; 287145516Sdarrenr case NCMD: 288145516Sdarrenr evalcommand(n, flags, (struct backcmd *)NULL); 289145516Sdarrenr do_etest = !(flags & EV_TESTED); 290145516Sdarrenr break; 291145516Sdarrenr default: 292145516Sdarrenr out1fmt("Node type = %d\n", n->type); 293145516Sdarrenr flushout(&output); 294145516Sdarrenr break; 295170268Sdarrenr } 296145516Sdarrenr n = next; 297145516Sdarrenr popstackmark(&smark); 298145516Sdarrenr setstackmark(&smark); 299145516Sdarrenr } while (n != NULL); 300145516Sdarrenrout: 301145516Sdarrenr popstackmark(&smark); 302145516Sdarrenr if (pendingsig) 303145516Sdarrenr dotrap(); 304145516Sdarrenr if (eflag && exitstatus != 0 && do_etest) 305145516Sdarrenr exitshell(exitstatus); 306145516Sdarrenr if (flags & EV_EXIT) 307145516Sdarrenr exraise(EXEXIT); 308145516Sdarrenr} 309145516Sdarrenr 310145516Sdarrenr 311145516Sdarrenrstatic void 312145516Sdarrenrevalloop(union node *n, int flags) 313170268Sdarrenr{ 314170268Sdarrenr int status; 315170268Sdarrenr 316170268Sdarrenr loopnest++; 317170268Sdarrenr status = 0; 318145516Sdarrenr for (;;) { 319145516Sdarrenr evaltree(n->nbinary.ch1, EV_TESTED); 320170268Sdarrenr if (evalskip) { 321145516Sdarrenrskipping: if (evalskip == SKIPCONT && --skipcount <= 0) { 322145516Sdarrenr evalskip = 0; 323145516Sdarrenr continue; 324145516Sdarrenr } 325145516Sdarrenr if (evalskip == SKIPBREAK && --skipcount <= 0) 326145516Sdarrenr evalskip = 0; 327145516Sdarrenr if (evalskip == SKIPRETURN) 328145516Sdarrenr status = exitstatus; 329145516Sdarrenr break; 330145516Sdarrenr } 331145516Sdarrenr if (n->type == NWHILE) { 332145516Sdarrenr if (exitstatus != 0) 333145516Sdarrenr break; 334170268Sdarrenr } else { 335170268Sdarrenr if (exitstatus == 0) 336145516Sdarrenr break; 337145516Sdarrenr } 338153876Sguido evaltree(n->nbinary.ch2, flags); 339145516Sdarrenr status = exitstatus; 340145516Sdarrenr if (evalskip) 341145516Sdarrenr goto skipping; 342145516Sdarrenr } 343145516Sdarrenr loopnest--; 344145516Sdarrenr exitstatus = status; 345145516Sdarrenr} 346145516Sdarrenr 347145516Sdarrenr 348145516Sdarrenr 349145516Sdarrenrstatic void 350173181Sdarrenrevalfor(union node *n, int flags) 351145516Sdarrenr{ 352145516Sdarrenr struct arglist arglist; 353145516Sdarrenr union node *argp; 354145516Sdarrenr struct strlist *sp; 355145516Sdarrenr int status; 356145516Sdarrenr 357170268Sdarrenr arglist.lastp = &arglist.list; 358145516Sdarrenr for (argp = n->nfor.args ; argp ; argp = argp->narg.next) { 359145516Sdarrenr oexitstatus = exitstatus; 360145516Sdarrenr expandarg(argp, &arglist, EXP_FULL | EXP_TILDE); 361145516Sdarrenr } 362145516Sdarrenr *arglist.lastp = NULL; 363145516Sdarrenr 364161356Sguido loopnest++; 365145516Sdarrenr status = 0; 366145516Sdarrenr for (sp = arglist.list ; sp ; sp = sp->next) { 367145516Sdarrenr setvar(n->nfor.var, sp->text, 0); 368145516Sdarrenr evaltree(n->nfor.body, flags); 369145516Sdarrenr status = exitstatus; 370145516Sdarrenr if (evalskip) { 371145516Sdarrenr if (evalskip == SKIPCONT && --skipcount <= 0) { 372145516Sdarrenr evalskip = 0; 373145516Sdarrenr continue; 374145516Sdarrenr } 375145516Sdarrenr if (evalskip == SKIPBREAK && --skipcount <= 0) 376145516Sdarrenr evalskip = 0; 377145516Sdarrenr break; 378145516Sdarrenr } 379145516Sdarrenr } 380145516Sdarrenr loopnest--; 381145516Sdarrenr exitstatus = status; 382145516Sdarrenr} 383145516Sdarrenr 384145516Sdarrenr 385145516Sdarrenr/* 386145516Sdarrenr * Evaluate a case statement, returning the selected tree. 387145516Sdarrenr * 388145516Sdarrenr * The exit status needs care to get right. 389145516Sdarrenr */ 390145516Sdarrenr 391145516Sdarrenrstatic union node * 392145516Sdarrenrevalcase(union node *n) 393145516Sdarrenr{ 394145516Sdarrenr union node *cp; 395145516Sdarrenr union node *patp; 396145516Sdarrenr struct arglist arglist; 397145516Sdarrenr 398145516Sdarrenr arglist.lastp = &arglist.list; 399145516Sdarrenr oexitstatus = exitstatus; 400145516Sdarrenr expandarg(n->ncase.expr, &arglist, EXP_TILDE); 401145516Sdarrenr for (cp = n->ncase.cases ; cp ; cp = cp->nclist.next) { 402145516Sdarrenr for (patp = cp->nclist.pattern ; patp ; patp = patp->narg.next) { 403145516Sdarrenr if (casematch(patp, arglist.list->text)) { 404145516Sdarrenr while (cp->nclist.next && 405145516Sdarrenr cp->type == NCLISTFALLTHRU && 406145516Sdarrenr cp->nclist.body == NULL) 407145516Sdarrenr cp = cp->nclist.next; 408145516Sdarrenr if (cp->nclist.next && 409145516Sdarrenr cp->type == NCLISTFALLTHRU) 410145516Sdarrenr return (cp); 411145516Sdarrenr if (cp->nclist.body == NULL) 412145516Sdarrenr exitstatus = 0; 413145516Sdarrenr return (cp->nclist.body); 414145516Sdarrenr } 415145516Sdarrenr } 416145516Sdarrenr } 417145516Sdarrenr exitstatus = 0; 418145516Sdarrenr return (NULL); 419145516Sdarrenr} 420145516Sdarrenr 421145516Sdarrenr 422145516Sdarrenr 423145516Sdarrenr/* 424145516Sdarrenr * Kick off a subshell to evaluate a tree. 425145516Sdarrenr */ 426145516Sdarrenr 427145516Sdarrenrstatic void 428145516Sdarrenrevalsubshell(union node *n, int flags) 429145516Sdarrenr{ 430145516Sdarrenr struct job *jp; 431145516Sdarrenr int backgnd = (n->type == NBACKGND); 432145516Sdarrenr 433145516Sdarrenr oexitstatus = exitstatus; 434145516Sdarrenr expredir(n->nredir.redirect); 435145516Sdarrenr if ((!backgnd && flags & EV_EXIT && !have_traps()) || 436145516Sdarrenr forkshell(jp = makejob(n, 1), n, backgnd) == 0) { 437145516Sdarrenr if (backgnd) 438145516Sdarrenr flags &=~ EV_TESTED; 439145516Sdarrenr redirect(n->nredir.redirect, 0); 440145516Sdarrenr evaltree(n->nredir.n, flags | EV_EXIT); /* never returns */ 441145516Sdarrenr } else if (! backgnd) { 442145516Sdarrenr INTOFF; 443145516Sdarrenr exitstatus = waitforjob(jp, (int *)NULL); 444145516Sdarrenr INTON; 445145516Sdarrenr } else 446145516Sdarrenr exitstatus = 0; 447145516Sdarrenr} 448145516Sdarrenr 449145516Sdarrenr 450145516Sdarrenr/* 451145516Sdarrenr * Evaluate a redirected compound command. 452145516Sdarrenr */ 453145516Sdarrenr 454145516Sdarrenrstatic void 455145516Sdarrenrevalredir(union node *n, int flags) 456145516Sdarrenr{ 457145516Sdarrenr struct jmploc jmploc; 458145516Sdarrenr struct jmploc *savehandler; 459145516Sdarrenr volatile int in_redirect = 1; 460145516Sdarrenr 461145516Sdarrenr oexitstatus = exitstatus; 462145516Sdarrenr expredir(n->nredir.redirect); 463145516Sdarrenr savehandler = handler; 464145516Sdarrenr if (setjmp(jmploc.loc)) { 465145516Sdarrenr int e; 466145516Sdarrenr 467145516Sdarrenr handler = savehandler; 468145516Sdarrenr e = exception; 469145516Sdarrenr popredir(); 470145516Sdarrenr if (e == EXERROR || e == EXEXEC) { 471145516Sdarrenr if (in_redirect) { 472145516Sdarrenr exitstatus = 2; 473145516Sdarrenr return; 474145516Sdarrenr } 475145516Sdarrenr } 476145516Sdarrenr longjmp(handler->loc, 1); 477145516Sdarrenr } else { 478145516Sdarrenr INTOFF; 479145516Sdarrenr handler = &jmploc; 480145516Sdarrenr redirect(n->nredir.redirect, REDIR_PUSH); 481145516Sdarrenr in_redirect = 0; 482145516Sdarrenr INTON; 483145516Sdarrenr evaltree(n->nredir.n, flags); 484145516Sdarrenr } 485145516Sdarrenr INTOFF; 486145516Sdarrenr handler = savehandler; 487161356Sguido popredir(); 488145516Sdarrenr INTON; 489170268Sdarrenr} 490170268Sdarrenr 491170268Sdarrenr 492161356Sguidostatic void 493161356Sguidoexphere(union node *redir, struct arglist *fn) 494161356Sguido{ 495145516Sdarrenr struct jmploc jmploc; 496161356Sguido struct jmploc *savehandler; 497145516Sdarrenr struct localvar *savelocalvars; 498145516Sdarrenr int need_longjmp = 0; 499145516Sdarrenr 500145516Sdarrenr redir->nhere.expdoc = nullstr; 501161356Sguido savelocalvars = localvars; 502145516Sdarrenr localvars = NULL; 503145516Sdarrenr forcelocal++; 504145516Sdarrenr savehandler = handler; 505145516Sdarrenr if (setjmp(jmploc.loc)) 506145516Sdarrenr need_longjmp = exception != EXERROR && exception != EXEXEC; 507145516Sdarrenr else { 508145516Sdarrenr handler = &jmploc; 509145516Sdarrenr expandarg(redir->nhere.doc, fn, 0); 510145516Sdarrenr redir->nhere.expdoc = fn->list->text; 511145516Sdarrenr INTOFF; 512145516Sdarrenr } 513145516Sdarrenr handler = savehandler; 514145516Sdarrenr forcelocal--; 515145516Sdarrenr poplocalvars(); 516145516Sdarrenr localvars = savelocalvars; 517145516Sdarrenr if (need_longjmp) 518145516Sdarrenr longjmp(handler->loc, 1); 519145516Sdarrenr INTON; 520145516Sdarrenr} 521145516Sdarrenr 522145516Sdarrenr 523145516Sdarrenr/* 524145516Sdarrenr * Compute the names of the files in a redirection list. 525145516Sdarrenr */ 526145516Sdarrenr 527145516Sdarrenrstatic void 528170268Sdarrenrexpredir(union node *n) 529170268Sdarrenr{ 530170268Sdarrenr union node *redir; 531145516Sdarrenr 532145516Sdarrenr for (redir = n ; redir ; redir = redir->nfile.next) { 533145516Sdarrenr struct arglist fn; 534145516Sdarrenr fn.lastp = &fn.list; 535145516Sdarrenr switch (redir->type) { 536145516Sdarrenr case NFROM: 537145516Sdarrenr case NTO: 538145516Sdarrenr case NFROMTO: 539145516Sdarrenr case NAPPEND: 540145516Sdarrenr case NCLOBBER: 541145516Sdarrenr expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR); 542145516Sdarrenr redir->nfile.expfname = fn.list->text; 543145516Sdarrenr break; 544145516Sdarrenr case NFROMFD: 545145516Sdarrenr case NTOFD: 546145516Sdarrenr if (redir->ndup.vname) { 547145516Sdarrenr expandarg(redir->ndup.vname, &fn, EXP_TILDE | EXP_REDIR); 548145516Sdarrenr fixredir(redir, fn.list->text, 1); 549145516Sdarrenr } 550145516Sdarrenr break; 551145516Sdarrenr case NXHERE: 552145516Sdarrenr exphere(redir, &fn); 553145516Sdarrenr break; 554145516Sdarrenr } 555145516Sdarrenr } 556145516Sdarrenr} 557145516Sdarrenr 558145516Sdarrenr 559145516Sdarrenr 560145516Sdarrenr/* 561145516Sdarrenr * Evaluate a pipeline. All the processes in the pipeline are children 562145516Sdarrenr * of the process creating the pipeline. (This differs from some versions 563145516Sdarrenr * of the shell, which make the last process in a pipeline the parent 564145516Sdarrenr * of all the rest.) 565145516Sdarrenr */ 566145516Sdarrenr 567145516Sdarrenrstatic void 568145516Sdarrenrevalpipe(union node *n) 569145516Sdarrenr{ 570145516Sdarrenr struct job *jp; 571145516Sdarrenr struct nodelist *lp; 572145516Sdarrenr int pipelen; 573145516Sdarrenr int prevfd; 574145516Sdarrenr int pip[2]; 575145516Sdarrenr 576145516Sdarrenr TRACE(("evalpipe(%p) called\n", (void *)n)); 577145516Sdarrenr pipelen = 0; 578145516Sdarrenr for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) 579145516Sdarrenr pipelen++; 580145516Sdarrenr INTOFF; 581145516Sdarrenr jp = makejob(n, pipelen); 582145516Sdarrenr prevfd = -1; 583145516Sdarrenr for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { 584145516Sdarrenr prehash(lp->n); 585145516Sdarrenr pip[1] = -1; 586145516Sdarrenr if (lp->next) { 587145516Sdarrenr if (pipe(pip) < 0) { 588145516Sdarrenr if (prevfd >= 0) 589145516Sdarrenr close(prevfd); 590145516Sdarrenr error("Pipe call failed: %s", strerror(errno)); 591145516Sdarrenr } 592145516Sdarrenr } 593145516Sdarrenr if (forkshell(jp, lp->n, n->npipe.backgnd) == 0) { 594145516Sdarrenr INTON; 595145516Sdarrenr if (prevfd > 0) { 596145516Sdarrenr dup2(prevfd, 0); 597145516Sdarrenr close(prevfd); 598145516Sdarrenr } 599145516Sdarrenr if (pip[1] >= 0) { 600145516Sdarrenr if (!(prevfd >= 0 && pip[0] == 0)) 601145516Sdarrenr close(pip[0]); 602145516Sdarrenr if (pip[1] != 1) { 603145516Sdarrenr dup2(pip[1], 1); 604145516Sdarrenr close(pip[1]); 605145516Sdarrenr } 606145516Sdarrenr } 607145516Sdarrenr evaltree(lp->n, EV_EXIT); 608145516Sdarrenr } 609145516Sdarrenr if (prevfd >= 0) 610145516Sdarrenr close(prevfd); 611145516Sdarrenr prevfd = pip[0]; 612145516Sdarrenr if (pip[1] != -1) 613145516Sdarrenr close(pip[1]); 614145516Sdarrenr } 615145516Sdarrenr INTON; 616145516Sdarrenr if (n->npipe.backgnd == 0) { 617145516Sdarrenr INTOFF; 618145516Sdarrenr exitstatus = waitforjob(jp, (int *)NULL); 619145516Sdarrenr TRACE(("evalpipe: job done exit status %d\n", exitstatus)); 620145516Sdarrenr INTON; 621145516Sdarrenr } else 622145516Sdarrenr exitstatus = 0; 623145516Sdarrenr} 624145516Sdarrenr 625145516Sdarrenr 626145516Sdarrenr 627145516Sdarrenrstatic int 628145516Sdarrenris_valid_fast_cmdsubst(union node *n) 629145516Sdarrenr{ 630145516Sdarrenr 631145516Sdarrenr return (n->type == NCMD); 632145516Sdarrenr} 633145516Sdarrenr 634145516Sdarrenr/* 635145516Sdarrenr * Execute a command inside back quotes. If it's a builtin command, we 636145516Sdarrenr * want to save its output in a block obtained from malloc. Otherwise 637145516Sdarrenr * we fork off a subprocess and get the output of the command via a pipe. 638145516Sdarrenr * Should be called with interrupts off. 639145516Sdarrenr */ 640145516Sdarrenr 641145516Sdarrenrvoid 642145516Sdarrenrevalbackcmd(union node *n, struct backcmd *result) 643145516Sdarrenr{ 644145516Sdarrenr int pip[2]; 645145516Sdarrenr struct job *jp; 646145516Sdarrenr struct stackmark smark; 647145516Sdarrenr struct jmploc jmploc; 648145516Sdarrenr struct jmploc *savehandler; 649145516Sdarrenr struct localvar *savelocalvars; 650145516Sdarrenr 651145516Sdarrenr setstackmark(&smark); 652145516Sdarrenr result->fd = -1; 653145516Sdarrenr result->buf = NULL; 654145516Sdarrenr result->nleft = 0; 655145516Sdarrenr result->jp = NULL; 656145516Sdarrenr if (n == NULL) { 657145516Sdarrenr exitstatus = 0; 658145516Sdarrenr goto out; 659145516Sdarrenr } 660145516Sdarrenr exitstatus = oexitstatus; 661181803Sbz if (is_valid_fast_cmdsubst(n)) { 662145516Sdarrenr savelocalvars = localvars; 663145516Sdarrenr localvars = NULL; 664145516Sdarrenr forcelocal++; 665181803Sbz savehandler = handler; 666145516Sdarrenr if (setjmp(jmploc.loc)) { 667145516Sdarrenr if (exception == EXERROR || exception == EXEXEC) 668145516Sdarrenr exitstatus = 2; 669145516Sdarrenr else if (exception != 0) { 670145516Sdarrenr handler = savehandler; 671145516Sdarrenr forcelocal--; 672145516Sdarrenr poplocalvars(); 673145516Sdarrenr localvars = savelocalvars; 674145516Sdarrenr longjmp(handler->loc, 1); 675145516Sdarrenr } 676145516Sdarrenr } else { 677145516Sdarrenr handler = &jmploc; 678145516Sdarrenr evalcommand(n, EV_BACKCMD, result); 679145516Sdarrenr } 680145516Sdarrenr handler = savehandler; 681145516Sdarrenr forcelocal--; 682145516Sdarrenr poplocalvars(); 683145516Sdarrenr localvars = savelocalvars; 684145516Sdarrenr } else { 685145516Sdarrenr if (pipe(pip) < 0) 686145516Sdarrenr error("Pipe call failed: %s", strerror(errno)); 687145516Sdarrenr jp = makejob(n, 1); 688145516Sdarrenr if (forkshell(jp, n, FORK_NOJOB) == 0) { 689145516Sdarrenr FORCEINTON; 690145516Sdarrenr close(pip[0]); 691145516Sdarrenr if (pip[1] != 1) { 692145516Sdarrenr dup2(pip[1], 1); 693145516Sdarrenr close(pip[1]); 694145516Sdarrenr } 695145516Sdarrenr evaltree(n, EV_EXIT); 696145516Sdarrenr } 697145516Sdarrenr close(pip[1]); 698145516Sdarrenr result->fd = pip[0]; 699145516Sdarrenr result->jp = jp; 700145516Sdarrenr } 701145516Sdarrenrout: 702145516Sdarrenr popstackmark(&smark); 703145516Sdarrenr TRACE(("evalbackcmd done: fd=%d buf=%p nleft=%d jp=%p\n", 704145516Sdarrenr result->fd, result->buf, result->nleft, result->jp)); 705145516Sdarrenr} 706145516Sdarrenr 707145516Sdarrenrstatic int 708145516Sdarrenrmustexpandto(const char *argtext, const char *mask) 709145516Sdarrenr{ 710145516Sdarrenr for (;;) { 711145516Sdarrenr if (*argtext == CTLQUOTEMARK || *argtext == CTLQUOTEEND) { 712145516Sdarrenr argtext++; 713145516Sdarrenr continue; 714145516Sdarrenr } 715145516Sdarrenr if (*argtext == CTLESC) 716145516Sdarrenr argtext++; 717145516Sdarrenr else if (BASESYNTAX[(int)*argtext] == CCTL) 718172776Sdarrenr return (0); 719145516Sdarrenr if (*argtext != *mask) 720145516Sdarrenr return (0); 721145516Sdarrenr if (*argtext == '\0') 722145516Sdarrenr return (1); 723145516Sdarrenr argtext++; 724145516Sdarrenr mask++; 725145516Sdarrenr } 726145516Sdarrenr} 727145516Sdarrenr 728145516Sdarrenrstatic int 729145516Sdarrenrisdeclarationcmd(struct narg *arg) 730145516Sdarrenr{ 731145516Sdarrenr int have_command = 0; 732145516Sdarrenr 733145516Sdarrenr if (arg == NULL) 734145516Sdarrenr return (0); 735145516Sdarrenr while (mustexpandto(arg->text, "command")) { 736145516Sdarrenr have_command = 1; 737145516Sdarrenr arg = &arg->next->narg; 738145516Sdarrenr if (arg == NULL) 739145516Sdarrenr return (0); 740145516Sdarrenr /* 741145516Sdarrenr * To also allow "command -p" and "command --" as part of 742145516Sdarrenr * a declaration command, add code here. 743145516Sdarrenr * We do not do this, as ksh does not do it either and it 744145516Sdarrenr * is not required by POSIX. 745145516Sdarrenr */ 746145516Sdarrenr } 747145516Sdarrenr return (mustexpandto(arg->text, "export") || 748145516Sdarrenr mustexpandto(arg->text, "readonly") || 749145516Sdarrenr (mustexpandto(arg->text, "local") && 750145516Sdarrenr (have_command || !isfunc("local")))); 751145516Sdarrenr} 752145516Sdarrenr 753145516Sdarrenr/* 754145516Sdarrenr * Check if a builtin can safely be executed in the same process, 755145516Sdarrenr * even though it should be in a subshell (command substitution). 756145516Sdarrenr * Note that jobid, jobs, times and trap can show information not 757145516Sdarrenr * available in a child process; this is deliberate. 758145516Sdarrenr * The arguments should already have been expanded. 759145516Sdarrenr */ 760145516Sdarrenrstatic int 761145516Sdarrenrsafe_builtin(int idx, int argc, char **argv) 762145516Sdarrenr{ 763145516Sdarrenr if (idx == BLTINCMD || idx == COMMANDCMD || idx == ECHOCMD || 764145516Sdarrenr idx == FALSECMD || idx == JOBIDCMD || idx == JOBSCMD || 765145516Sdarrenr idx == KILLCMD || idx == PRINTFCMD || idx == PWDCMD || 766145516Sdarrenr idx == TESTCMD || idx == TIMESCMD || idx == TRUECMD || 767145516Sdarrenr idx == TYPECMD) 768145516Sdarrenr return (1); 769145516Sdarrenr if (idx == EXPORTCMD || idx == TRAPCMD || idx == ULIMITCMD || 770145516Sdarrenr idx == UMASKCMD) 771145516Sdarrenr return (argc <= 1 || (argc == 2 && argv[1][0] == '-')); 772145516Sdarrenr if (idx == SETCMD) 773145516Sdarrenr return (argc <= 1 || (argc == 2 && (argv[1][0] == '-' || 774145516Sdarrenr argv[1][0] == '+') && argv[1][1] == 'o' && 775145516Sdarrenr argv[1][2] == '\0')); 776145516Sdarrenr return (0); 777145516Sdarrenr} 778145516Sdarrenr 779145516Sdarrenr/* 780145516Sdarrenr * Execute a simple command. 781145516Sdarrenr * Note: This may or may not return if (flags & EV_EXIT). 782145516Sdarrenr */ 783145516Sdarrenr 784145516Sdarrenrstatic void 785145516Sdarrenrevalcommand(union node *cmd, int flags, struct backcmd *backcmd) 786145516Sdarrenr{ 787145516Sdarrenr union node *argp; 788145516Sdarrenr struct arglist arglist; 789145516Sdarrenr struct arglist varlist; 790145516Sdarrenr char **argv; 791145516Sdarrenr int argc; 792145516Sdarrenr char **envp; 793145516Sdarrenr int varflag; 794145516Sdarrenr struct strlist *sp; 795145516Sdarrenr int mode; 796145516Sdarrenr int pip[2]; 797145516Sdarrenr struct cmdentry cmdentry; 798145516Sdarrenr struct job *jp; 799145516Sdarrenr struct jmploc jmploc; 800145516Sdarrenr struct jmploc *savehandler; 801145516Sdarrenr char *savecmdname; 802145516Sdarrenr struct shparam saveparam; 803145516Sdarrenr struct localvar *savelocalvars; 804145516Sdarrenr struct parsefile *savetopfile; 805145516Sdarrenr volatile int e; 806145516Sdarrenr char *lastarg; 807145516Sdarrenr int realstatus; 808145516Sdarrenr int do_clearcmdentry; 809145516Sdarrenr const char *path = pathval(); 810145516Sdarrenr 811145516Sdarrenr /* First expand the arguments. */ 812145516Sdarrenr TRACE(("evalcommand(%p, %d) called\n", (void *)cmd, flags)); 813145516Sdarrenr arglist.lastp = &arglist.list; 814145516Sdarrenr varlist.lastp = &varlist.list; 815145516Sdarrenr varflag = 1; 816145516Sdarrenr jp = NULL; 817145516Sdarrenr do_clearcmdentry = 0; 818145516Sdarrenr oexitstatus = exitstatus; 819145516Sdarrenr exitstatus = 0; 820145516Sdarrenr for (argp = cmd->ncmd.args ; argp ; argp = argp->narg.next) { 821145516Sdarrenr if (varflag && isassignment(argp->narg.text)) { 822145516Sdarrenr expandarg(argp, varflag == 1 ? &varlist : &arglist, 823145516Sdarrenr EXP_VARTILDE); 824145516Sdarrenr continue; 825145516Sdarrenr } else if (varflag == 1) 826145516Sdarrenr varflag = isdeclarationcmd(&argp->narg) ? 2 : 0; 827145516Sdarrenr expandarg(argp, &arglist, EXP_FULL | EXP_TILDE); 828145516Sdarrenr } 829145516Sdarrenr *arglist.lastp = NULL; 830145516Sdarrenr *varlist.lastp = NULL; 831145516Sdarrenr expredir(cmd->ncmd.redirect); 832145516Sdarrenr argc = 0; 833145516Sdarrenr for (sp = arglist.list ; sp ; sp = sp->next) 834145516Sdarrenr argc++; 835145516Sdarrenr /* Add one slot at the beginning for tryexec(). */ 836145516Sdarrenr argv = stalloc(sizeof (char *) * (argc + 2)); 837145516Sdarrenr argv++; 838145516Sdarrenr 839145516Sdarrenr for (sp = arglist.list ; sp ; sp = sp->next) { 840145516Sdarrenr TRACE(("evalcommand arg: %s\n", sp->text)); 841145516Sdarrenr *argv++ = sp->text; 842145516Sdarrenr } 843145516Sdarrenr *argv = NULL; 844145516Sdarrenr lastarg = NULL; 845145516Sdarrenr if (iflag && funcnest == 0 && argc > 0) 846145516Sdarrenr lastarg = argv[-1]; 847145516Sdarrenr argv -= argc; 848145516Sdarrenr 849145516Sdarrenr /* Print the command if xflag is set. */ 850145516Sdarrenr if (xflag) { 851145516Sdarrenr char sep = 0; 852145516Sdarrenr const char *p, *ps4; 853145516Sdarrenr ps4 = expandstr(ps4val()); 854145516Sdarrenr out2str(ps4 != NULL ? ps4 : ps4val()); 855145516Sdarrenr for (sp = varlist.list ; sp ; sp = sp->next) { 856145516Sdarrenr if (sep != 0) 857145516Sdarrenr out2c(' '); 858145516Sdarrenr p = strchr(sp->text, '='); 859145516Sdarrenr if (p != NULL) { 860145516Sdarrenr p++; 861145516Sdarrenr outbin(sp->text, p - sp->text, out2); 862145516Sdarrenr out2qstr(p); 863145516Sdarrenr } else 864145516Sdarrenr out2qstr(sp->text); 865145516Sdarrenr sep = ' '; 866145516Sdarrenr } 867145516Sdarrenr for (sp = arglist.list ; sp ; sp = sp->next) { 868145516Sdarrenr if (sep != 0) 869145516Sdarrenr out2c(' '); 870145516Sdarrenr /* Disambiguate command looking like assignment. */ 871145516Sdarrenr if (sp == arglist.list && 872145516Sdarrenr strchr(sp->text, '=') != NULL && 873145516Sdarrenr strchr(sp->text, '\'') == NULL) { 874145516Sdarrenr out2c('\''); 875145516Sdarrenr out2str(sp->text); 876145516Sdarrenr out2c('\''); 877145516Sdarrenr } else 878145516Sdarrenr out2qstr(sp->text); 879145516Sdarrenr sep = ' '; 880145516Sdarrenr } 881145516Sdarrenr out2c('\n'); 882145516Sdarrenr flushout(&errout); 883145516Sdarrenr } 884170268Sdarrenr 885145516Sdarrenr /* Now locate the command. */ 886145516Sdarrenr if (argc == 0) { 887145516Sdarrenr /* Variable assignment(s) without command */ 888145516Sdarrenr cmdentry.cmdtype = CMDBUILTIN; 889145516Sdarrenr cmdentry.u.index = BLTINCMD; 890145516Sdarrenr cmdentry.special = 0; 891173181Sdarrenr } else { 892173181Sdarrenr static const char PATH[] = "PATH="; 893173181Sdarrenr int cmd_flags = 0, bltinonly = 0; 894173181Sdarrenr 895145516Sdarrenr /* 896145516Sdarrenr * Modify the command lookup path, if a PATH= assignment 897145516Sdarrenr * is present 898145516Sdarrenr */ 899145516Sdarrenr for (sp = varlist.list ; sp ; sp = sp->next) 900145516Sdarrenr if (strncmp(sp->text, PATH, sizeof(PATH) - 1) == 0) { 901173181Sdarrenr path = sp->text + sizeof(PATH) - 1; 902145516Sdarrenr /* 903145516Sdarrenr * On `PATH=... command`, we need to make 904145516Sdarrenr * sure that the command isn't using the 905145516Sdarrenr * non-updated hash table of the outer PATH 906145516Sdarrenr * setting and we need to make sure that 907145516Sdarrenr * the hash table isn't filled with items 908145516Sdarrenr * from the temporary setting. 909145516Sdarrenr * 910161356Sguido * It would be better to forbit using and 911161356Sguido * updating the table while this command 912145516Sdarrenr * runs, by the command finding mechanism 913145516Sdarrenr * is heavily integrated with hash handling, 914145516Sdarrenr * so we just delete the hash before and after 915145516Sdarrenr * the command runs. Partly deleting like 916145516Sdarrenr * changepatch() does doesn't seem worth the 917145516Sdarrenr * bookinging effort, since most such runs add 918145516Sdarrenr * directories in front of the new PATH. 919145516Sdarrenr */ 920145516Sdarrenr clearcmdentry(); 921145516Sdarrenr do_clearcmdentry = 1; 922145516Sdarrenr } 923145516Sdarrenr 924145516Sdarrenr for (;;) { 925161356Sguido if (bltinonly) { 926161356Sguido cmdentry.u.index = find_builtin(*argv, &cmdentry.special); 927145516Sdarrenr if (cmdentry.u.index < 0) { 928145516Sdarrenr cmdentry.u.index = BLTINCMD; 929145516Sdarrenr argv--; 930145516Sdarrenr argc++; 931145516Sdarrenr break; 932145516Sdarrenr } 933161356Sguido } else 934145516Sdarrenr find_command(argv[0], &cmdentry, cmd_flags, path); 935145516Sdarrenr /* implement the bltin and command builtins here */ 936145516Sdarrenr if (cmdentry.cmdtype != CMDBUILTIN) 937145516Sdarrenr break; 938145516Sdarrenr if (cmdentry.u.index == BLTINCMD) { 939145516Sdarrenr if (argc == 1) 940145516Sdarrenr break; 941145516Sdarrenr argv++; 942145516Sdarrenr argc--; 943145516Sdarrenr bltinonly = 1; 944145516Sdarrenr } else if (cmdentry.u.index == COMMANDCMD) { 945145516Sdarrenr if (argc == 1) 946145516Sdarrenr break; 947145516Sdarrenr if (!strcmp(argv[1], "-p")) { 948145516Sdarrenr if (argc == 2) 949145516Sdarrenr break; 950145516Sdarrenr if (argv[2][0] == '-') { 951145516Sdarrenr if (strcmp(argv[2], "--")) 952145516Sdarrenr break; 953145516Sdarrenr if (argc == 3) 954145516Sdarrenr break; 955145516Sdarrenr argv += 3; 956145516Sdarrenr argc -= 3; 957145516Sdarrenr } else { 958145516Sdarrenr argv += 2; 959145516Sdarrenr argc -= 2; 960145516Sdarrenr } 961145516Sdarrenr path = _PATH_STDPATH; 962145516Sdarrenr clearcmdentry(); 963145516Sdarrenr do_clearcmdentry = 1; 964145516Sdarrenr } else if (!strcmp(argv[1], "--")) { 965145516Sdarrenr if (argc == 2) 966145516Sdarrenr break; 967145516Sdarrenr argv += 2; 968145516Sdarrenr argc -= 2; 969145516Sdarrenr } else if (argv[1][0] == '-') 970145516Sdarrenr break; 971145516Sdarrenr else { 972145516Sdarrenr argv++; 973145516Sdarrenr argc--; 974145516Sdarrenr } 975161356Sguido cmd_flags |= DO_NOFUNC; 976161356Sguido bltinonly = 0; 977145516Sdarrenr } else 978145516Sdarrenr break; 979178888Sjulian } 980145516Sdarrenr /* 981145516Sdarrenr * Special builtins lose their special properties when 982145516Sdarrenr * called via 'command'. 983145516Sdarrenr */ 984145516Sdarrenr if (cmd_flags & DO_NOFUNC) 985145516Sdarrenr cmdentry.special = 0; 986145516Sdarrenr } 987145516Sdarrenr 988145516Sdarrenr /* Fork off a child process if necessary. */ 989145516Sdarrenr if (((cmdentry.cmdtype == CMDNORMAL || cmdentry.cmdtype == CMDUNKNOWN) 990145516Sdarrenr && ((flags & EV_EXIT) == 0 || have_traps())) 991145516Sdarrenr || ((flags & EV_BACKCMD) != 0 992145516Sdarrenr && (cmdentry.cmdtype != CMDBUILTIN || 993145516Sdarrenr !safe_builtin(cmdentry.u.index, argc, argv)))) { 994145516Sdarrenr jp = makejob(cmd, 1); 995145516Sdarrenr mode = FORK_FG; 996145516Sdarrenr if (flags & EV_BACKCMD) { 997145516Sdarrenr mode = FORK_NOJOB; 998145516Sdarrenr if (pipe(pip) < 0) 999170268Sdarrenr error("Pipe call failed: %s", strerror(errno)); 1000170268Sdarrenr } 1001170268Sdarrenr if (cmdentry.cmdtype == CMDNORMAL && 1002145516Sdarrenr cmd->ncmd.redirect == NULL && 1003170268Sdarrenr varlist.list == NULL && 1004145516Sdarrenr (mode == FORK_FG || mode == FORK_NOJOB) && 1005145516Sdarrenr !disvforkset() && !iflag && !mflag) { 1006145516Sdarrenr vforkexecshell(jp, argv, environment(), path, 1007145516Sdarrenr cmdentry.u.index, flags & EV_BACKCMD ? pip : NULL); 1008145516Sdarrenr goto parent; 1009145516Sdarrenr } 1010145516Sdarrenr if (forkshell(jp, cmd, mode) != 0) 1011145516Sdarrenr goto parent; /* at end of routine */ 1012170268Sdarrenr if (flags & EV_BACKCMD) { 1013170268Sdarrenr FORCEINTON; 1014145516Sdarrenr close(pip[0]); 1015145516Sdarrenr if (pip[1] != 1) { 1016145516Sdarrenr dup2(pip[1], 1); 1017145516Sdarrenr close(pip[1]); 1018145516Sdarrenr } 1019145516Sdarrenr flags &= ~EV_BACKCMD; 1020145516Sdarrenr } 1021170268Sdarrenr flags |= EV_EXIT; 1022145516Sdarrenr } 1023145516Sdarrenr 1024145516Sdarrenr /* This is the child process if a fork occurred. */ 1025145516Sdarrenr /* Execute the command. */ 1026173181Sdarrenr if (cmdentry.cmdtype == CMDFUNCTION) { 1027145516Sdarrenr#ifdef DEBUG 1028145516Sdarrenr trputs("Shell function: "); trargs(argv); 1029145516Sdarrenr#endif 1030145516Sdarrenr saveparam = shellparam; 1031145516Sdarrenr shellparam.malloc = 0; 1032145516Sdarrenr shellparam.reset = 1; 1033145516Sdarrenr shellparam.nparam = argc - 1; 1034145516Sdarrenr shellparam.p = argv + 1; 1035145516Sdarrenr shellparam.optnext = NULL; 1036145516Sdarrenr INTOFF; 1037145516Sdarrenr savelocalvars = localvars; 1038145516Sdarrenr localvars = NULL; 1039145516Sdarrenr reffunc(cmdentry.u.func); 1040145516Sdarrenr savehandler = handler; 1041145516Sdarrenr if (setjmp(jmploc.loc)) { 1042145516Sdarrenr freeparam(&shellparam); 1043145516Sdarrenr shellparam = saveparam; 1044145516Sdarrenr popredir(); 1045145516Sdarrenr unreffunc(cmdentry.u.func); 1046145516Sdarrenr poplocalvars(); 1047145516Sdarrenr localvars = savelocalvars; 1048145516Sdarrenr funcnest--; 1049145516Sdarrenr handler = savehandler; 1050145516Sdarrenr longjmp(handler->loc, 1); 1051145516Sdarrenr } 1052145516Sdarrenr handler = &jmploc; 1053145516Sdarrenr funcnest++; 1054145516Sdarrenr redirect(cmd->ncmd.redirect, REDIR_PUSH); 1055145516Sdarrenr INTON; 1056145516Sdarrenr for (sp = varlist.list ; sp ; sp = sp->next) 1057145516Sdarrenr mklocal(sp->text); 1058145516Sdarrenr exitstatus = oexitstatus; 1059145516Sdarrenr evaltree(getfuncnode(cmdentry.u.func), 1060145516Sdarrenr flags & (EV_TESTED | EV_EXIT)); 1061145516Sdarrenr INTOFF; 1062145516Sdarrenr unreffunc(cmdentry.u.func); 1063145516Sdarrenr poplocalvars(); 1064145516Sdarrenr localvars = savelocalvars; 1065145516Sdarrenr freeparam(&shellparam); 1066145516Sdarrenr shellparam = saveparam; 1067145516Sdarrenr handler = savehandler; 1068145516Sdarrenr funcnest--; 1069145516Sdarrenr popredir(); 1070145516Sdarrenr INTON; 1071145516Sdarrenr if (evalskip == SKIPRETURN) { 1072145516Sdarrenr evalskip = 0; 1073145516Sdarrenr skipcount = 0; 1074145516Sdarrenr } 1075145516Sdarrenr if (jp) 1076145516Sdarrenr exitshell(exitstatus); 1077145516Sdarrenr } else if (cmdentry.cmdtype == CMDBUILTIN) { 1078145516Sdarrenr#ifdef DEBUG 1079145516Sdarrenr trputs("builtin command: "); trargs(argv); 1080145516Sdarrenr#endif 1081145516Sdarrenr mode = (cmdentry.u.index == EXECCMD)? 0 : REDIR_PUSH; 1082145516Sdarrenr if (flags == EV_BACKCMD) { 1083145516Sdarrenr memout.nleft = 0; 1084145516Sdarrenr memout.nextc = memout.buf; 1085145516Sdarrenr memout.bufsize = 64; 1086145516Sdarrenr mode |= REDIR_BACKQ; 1087145516Sdarrenr } 1088145516Sdarrenr savecmdname = commandname; 1089145516Sdarrenr savetopfile = getcurrentfile(); 1090145516Sdarrenr cmdenviron = varlist.list; 1091145516Sdarrenr e = -1; 1092145516Sdarrenr savehandler = handler; 1093145516Sdarrenr if (setjmp(jmploc.loc)) { 1094145516Sdarrenr e = exception; 1095145516Sdarrenr if (e == EXINT) 1096145516Sdarrenr exitstatus = SIGINT+128; 1097161356Sguido else if (e != EXEXIT) 1098145516Sdarrenr exitstatus = 2; 1099145516Sdarrenr goto cmddone; 1100145516Sdarrenr } 1101145516Sdarrenr handler = &jmploc; 1102145516Sdarrenr redirect(cmd->ncmd.redirect, mode); 1103145516Sdarrenr outclearerror(out1); 1104145516Sdarrenr /* 1105145516Sdarrenr * If there is no command word, redirection errors should 1106145516Sdarrenr * not be fatal but assignment errors should. 1107145516Sdarrenr */ 1108145516Sdarrenr if (argc == 0) 1109145516Sdarrenr cmdentry.special = 1; 1110145516Sdarrenr listsetvar(cmdenviron, cmdentry.special ? 0 : VNOSET); 1111145516Sdarrenr if (argc > 0) 1112145516Sdarrenr bltinsetlocale(); 1113145516Sdarrenr commandname = argv[0]; 1114145516Sdarrenr argptr = argv + 1; 1115145516Sdarrenr nextopt_optptr = NULL; /* initialize nextopt */ 1116145516Sdarrenr builtin_flags = flags; 1117145516Sdarrenr exitstatus = (*builtinfunc[cmdentry.u.index])(argc, argv); 1118145516Sdarrenr flushall(); 1119145516Sdarrenr if (outiserror(out1)) { 1120145516Sdarrenr warning("write error on stdout"); 1121145516Sdarrenr if (exitstatus == 0 || exitstatus == 1) 1122145516Sdarrenr exitstatus = 2; 1123145516Sdarrenr } 1124145516Sdarrenrcmddone: 1125145516Sdarrenr if (argc > 0) 1126145516Sdarrenr bltinunsetlocale(); 1127145516Sdarrenr cmdenviron = NULL; 1128145516Sdarrenr out1 = &output; 1129145516Sdarrenr out2 = &errout; 1130145516Sdarrenr freestdout(); 1131145516Sdarrenr handler = savehandler; 1132145516Sdarrenr commandname = savecmdname; 1133145516Sdarrenr if (jp) 1134145516Sdarrenr exitshell(exitstatus); 1135145516Sdarrenr if (flags == EV_BACKCMD) { 1136161356Sguido backcmd->buf = memout.buf; 1137145516Sdarrenr backcmd->nleft = memout.nextc - memout.buf; 1138145516Sdarrenr memout.buf = NULL; 1139145516Sdarrenr } 1140145516Sdarrenr if (cmdentry.u.index != EXECCMD) 1141145516Sdarrenr popredir(); 1142145516Sdarrenr if (e != -1) { 1143145516Sdarrenr if ((e != EXERROR && e != EXEXEC) 1144145516Sdarrenr || cmdentry.special) 1145145516Sdarrenr exraise(e); 1146145516Sdarrenr popfilesupto(savetopfile); 1147145516Sdarrenr if (flags != EV_BACKCMD) 1148145516Sdarrenr FORCEINTON; 1149145516Sdarrenr } 1150145516Sdarrenr } else { 1151145516Sdarrenr#ifdef DEBUG 1152145516Sdarrenr trputs("normal command: "); trargs(argv); 1153145516Sdarrenr#endif 1154145516Sdarrenr redirect(cmd->ncmd.redirect, 0); 1155145516Sdarrenr for (sp = varlist.list ; sp ; sp = sp->next) 1156145516Sdarrenr setvareq(sp->text, VEXPORT|VSTACK); 1157145516Sdarrenr envp = environment(); 1158145516Sdarrenr shellexec(argv, envp, path, cmdentry.u.index); 1159145516Sdarrenr /*NOTREACHED*/ 1160145516Sdarrenr } 1161145516Sdarrenr goto out; 1162145516Sdarrenr 1163145516Sdarrenrparent: /* parent process gets here (if we forked) */ 1164145516Sdarrenr if (mode == FORK_FG) { /* argument to fork */ 1165145516Sdarrenr INTOFF; 1166145516Sdarrenr exitstatus = waitforjob(jp, &realstatus); 1167178888Sjulian INTON; 1168145516Sdarrenr if (iflag && loopnest > 0 && WIFSIGNALED(realstatus)) { 1169145516Sdarrenr evalskip = SKIPBREAK; 1170145516Sdarrenr skipcount = loopnest; 1171145516Sdarrenr } 1172145516Sdarrenr } else if (mode == FORK_NOJOB) { 1173145516Sdarrenr backcmd->fd = pip[0]; 1174145516Sdarrenr close(pip[1]); 1175145516Sdarrenr backcmd->jp = jp; 1176145516Sdarrenr } 1177145516Sdarrenr 1178145516Sdarrenrout: 1179145516Sdarrenr if (lastarg) 1180145516Sdarrenr setvar("_", lastarg, 0); 1181145516Sdarrenr if (do_clearcmdentry) 1182145516Sdarrenr clearcmdentry(); 1183145516Sdarrenr} 1184145516Sdarrenr 1185145516Sdarrenr 1186145516Sdarrenr 1187145516Sdarrenr/* 1188145516Sdarrenr * Search for a command. This is called before we fork so that the 1189145516Sdarrenr * location of the command will be available in the parent as well as 1190145516Sdarrenr * the child. The check for "goodname" is an overly conservative 1191145516Sdarrenr * check that the name will not be subject to expansion. 1192145516Sdarrenr */ 1193145516Sdarrenr 1194145516Sdarrenrstatic void 1195145516Sdarrenrprehash(union node *n) 1196145516Sdarrenr{ 1197145516Sdarrenr struct cmdentry entry; 1198145516Sdarrenr 1199145516Sdarrenr if (n && n->type == NCMD && n->ncmd.args) 1200145516Sdarrenr if (goodname(n->ncmd.args->narg.text)) 1201145516Sdarrenr find_command(n->ncmd.args->narg.text, &entry, 0, 1202145516Sdarrenr pathval()); 1203145516Sdarrenr} 1204145516Sdarrenr 1205145516Sdarrenr 1206145516Sdarrenr 1207145516Sdarrenr/* 1208145516Sdarrenr * Builtin commands. Builtin commands whose functions are closely 1209145516Sdarrenr * tied to evaluation are implemented here. 1210145516Sdarrenr */ 1211145516Sdarrenr 1212145516Sdarrenr/* 1213145516Sdarrenr * No command given, a bltin command with no arguments, or a bltin command 1214145516Sdarrenr * with an invalid name. 1215145516Sdarrenr */ 1216145516Sdarrenr 1217145516Sdarrenrint 1218145516Sdarrenrbltincmd(int argc, char **argv) 1219145516Sdarrenr{ 1220145516Sdarrenr if (argc > 1) { 1221145516Sdarrenr out2fmt_flush("%s: not found\n", argv[1]); 1222145516Sdarrenr return 127; 1223145516Sdarrenr } 1224145516Sdarrenr /* 1225145516Sdarrenr * Preserve exitstatus of a previous possible redirection 1226145516Sdarrenr * as POSIX mandates 1227145516Sdarrenr */ 1228145516Sdarrenr return exitstatus; 1229145516Sdarrenr} 1230145516Sdarrenr 1231145516Sdarrenr 1232145516Sdarrenr/* 1233145516Sdarrenr * Handle break and continue commands. Break, continue, and return are 1234145516Sdarrenr * all handled by setting the evalskip flag. The evaluation routines 1235145516Sdarrenr * above all check this flag, and if it is set they start skipping 1236145516Sdarrenr * commands rather than executing them. The variable skipcount is 1237145516Sdarrenr * the number of loops to break/continue, or the number of function 1238145516Sdarrenr * levels to return. (The latter is always 1.) It should probably 1239161356Sguido * be an error to break out of more loops than exist, but it isn't 1240161356Sguido * in the standard shell so we don't make it one here. 1241161356Sguido */ 1242145516Sdarrenr 1243145516Sdarrenrint 1244145516Sdarrenrbreakcmd(int argc, char **argv) 1245145516Sdarrenr{ 1246145516Sdarrenr int n = argc > 1 ? number(argv[1]) : 1; 1247145516Sdarrenr 1248145516Sdarrenr if (n > loopnest) 1249145516Sdarrenr n = loopnest; 1250145516Sdarrenr if (n > 0) { 1251145516Sdarrenr evalskip = (**argv == 'c')? SKIPCONT : SKIPBREAK; 1252145516Sdarrenr skipcount = n; 1253145516Sdarrenr } 1254145516Sdarrenr return 0; 1255145516Sdarrenr} 1256145516Sdarrenr 1257145516Sdarrenr/* 1258145516Sdarrenr * The `command' command. 1259145516Sdarrenr */ 1260145516Sdarrenrint 1261145516Sdarrenrcommandcmd(int argc __unused, char **argv __unused) 1262145516Sdarrenr{ 1263145516Sdarrenr const char *path; 1264145516Sdarrenr int ch; 1265145516Sdarrenr int cmd = -1; 1266145516Sdarrenr 1267145516Sdarrenr path = bltinlookup("PATH", 1); 1268145516Sdarrenr 1269145516Sdarrenr while ((ch = nextopt("pvV")) != '\0') { 1270145516Sdarrenr switch (ch) { 1271145516Sdarrenr case 'p': 1272145516Sdarrenr path = _PATH_STDPATH; 1273145516Sdarrenr break; 1274145516Sdarrenr case 'v': 1275145516Sdarrenr cmd = TYPECMD_SMALLV; 1276145516Sdarrenr break; 1277145516Sdarrenr case 'V': 1278145516Sdarrenr cmd = TYPECMD_BIGV; 1279145516Sdarrenr break; 1280145516Sdarrenr } 1281145516Sdarrenr } 1282145516Sdarrenr 1283145516Sdarrenr if (cmd != -1) { 1284145516Sdarrenr if (*argptr == NULL || argptr[1] != NULL) 1285145516Sdarrenr error("wrong number of arguments"); 1286145516Sdarrenr return typecmd_impl(2, argptr - 1, cmd, path); 1287145516Sdarrenr } 1288145516Sdarrenr if (*argptr != NULL) 1289145516Sdarrenr error("commandcmd bad call"); 1290145516Sdarrenr 1291145516Sdarrenr /* 1292145516Sdarrenr * Do nothing successfully if no command was specified; 1293145516Sdarrenr * ksh also does this. 1294145516Sdarrenr */ 1295145516Sdarrenr return 0; 1296145516Sdarrenr} 1297145516Sdarrenr 1298145516Sdarrenr 1299145516Sdarrenr/* 1300145516Sdarrenr * The return command. 1301145516Sdarrenr */ 1302145516Sdarrenr 1303145516Sdarrenrint 1304145516Sdarrenrreturncmd(int argc, char **argv) 1305145516Sdarrenr{ 1306145516Sdarrenr int ret = argc > 1 ? number(argv[1]) : oexitstatus; 1307145516Sdarrenr 1308145516Sdarrenr evalskip = SKIPRETURN; 1309145516Sdarrenr skipcount = 1; 1310145516Sdarrenr return ret; 1311145516Sdarrenr} 1312145516Sdarrenr 1313145516Sdarrenr 1314145516Sdarrenrint 1315145516Sdarrenrfalsecmd(int argc __unused, char **argv __unused) 1316145516Sdarrenr{ 1317145516Sdarrenr return 1; 1318145516Sdarrenr} 1319145516Sdarrenr 1320145516Sdarrenr 1321145516Sdarrenrint 1322145516Sdarrenrtruecmd(int argc __unused, char **argv __unused) 1323145516Sdarrenr{ 1324145516Sdarrenr return 0; 1325145516Sdarrenr} 1326145516Sdarrenr 1327145516Sdarrenr 1328145516Sdarrenrint 1329145516Sdarrenrexeccmd(int argc, char **argv) 1330145516Sdarrenr{ 1331145516Sdarrenr /* 1332145516Sdarrenr * Because we have historically not supported any options, 1333145516Sdarrenr * only treat "--" specially. 1334145516Sdarrenr */ 1335145516Sdarrenr if (argc > 1 && strcmp(argv[1], "--") == 0) 1336172776Sdarrenr argc--, argv++; 1337172776Sdarrenr if (argc > 1) { 1338172776Sdarrenr struct strlist *sp; 1339145516Sdarrenr 1340145516Sdarrenr iflag = 0; /* exit on error */ 1341145516Sdarrenr mflag = 0; 1342145516Sdarrenr optschanged(); 1343145516Sdarrenr for (sp = cmdenviron; sp ; sp = sp->next) 1344145516Sdarrenr setvareq(sp->text, VEXPORT|VSTACK); 1345145516Sdarrenr shellexec(argv + 1, environment(), pathval(), 0); 1346145516Sdarrenr 1347145516Sdarrenr } 1348145516Sdarrenr return 0; 1349145516Sdarrenr} 1350145516Sdarrenr 1351145516Sdarrenr 1352145516Sdarrenrint 1353145516Sdarrenrtimescmd(int argc __unused, char **argv __unused) 1354172776Sdarrenr{ 1355145516Sdarrenr struct rusage ru; 1356172776Sdarrenr long shumins, shsmins, chumins, chsmins; 1357172776Sdarrenr double shusecs, shssecs, chusecs, chssecs; 1358172776Sdarrenr 1359172776Sdarrenr if (getrusage(RUSAGE_SELF, &ru) < 0) 1360145516Sdarrenr return 1; 1361145516Sdarrenr shumins = ru.ru_utime.tv_sec / 60; 1362145516Sdarrenr shusecs = ru.ru_utime.tv_sec % 60 + ru.ru_utime.tv_usec / 1000000.; 1363145516Sdarrenr shsmins = ru.ru_stime.tv_sec / 60; 1364145516Sdarrenr shssecs = ru.ru_stime.tv_sec % 60 + ru.ru_stime.tv_usec / 1000000.; 1365145516Sdarrenr if (getrusage(RUSAGE_CHILDREN, &ru) < 0) 1366145516Sdarrenr return 1; 1367145516Sdarrenr chumins = ru.ru_utime.tv_sec / 60; 1368145516Sdarrenr chusecs = ru.ru_utime.tv_sec % 60 + ru.ru_utime.tv_usec / 1000000.; 1369145516Sdarrenr chsmins = ru.ru_stime.tv_sec / 60; 1370145516Sdarrenr chssecs = ru.ru_stime.tv_sec % 60 + ru.ru_stime.tv_usec / 1000000.; 1371145516Sdarrenr out1fmt("%ldm%.3fs %ldm%.3fs\n%ldm%.3fs %ldm%.3fs\n", shumins, 1372145516Sdarrenr shusecs, shsmins, shssecs, chumins, chusecs, chsmins, chssecs); 1373145516Sdarrenr return 0; 1374145516Sdarrenr} 1375145516Sdarrenr