eval.c revision 231085
11556Srgrimes/*- 21556Srgrimes * Copyright (c) 1993 31556Srgrimes * The Regents of the University of California. All rights reserved. 41556Srgrimes * 51556Srgrimes * This code is derived from software contributed to Berkeley by 61556Srgrimes * Kenneth Almquist. 71556Srgrimes * 81556Srgrimes * Redistribution and use in source and binary forms, with or without 91556Srgrimes * modification, are permitted provided that the following conditions 101556Srgrimes * are met: 111556Srgrimes * 1. Redistributions of source code must retain the above copyright 121556Srgrimes * notice, this list of conditions and the following disclaimer. 131556Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 141556Srgrimes * notice, this list of conditions and the following disclaimer in the 151556Srgrimes * documentation and/or other materials provided with the distribution. 161556Srgrimes * 4. Neither the name of the University nor the names of its contributors 171556Srgrimes * may be used to endorse or promote products derived from this software 181556Srgrimes * without specific prior written permission. 191556Srgrimes * 201556Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 211556Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 221556Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 231556Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 241556Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 251556Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 261556Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 271556Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 281556Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 291556Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 301556Srgrimes * SUCH DAMAGE. 311556Srgrimes */ 321556Srgrimes 331556Srgrimes#ifndef lint 3436150Scharnier#if 0 3536150Scharnierstatic char sccsid[] = "@(#)eval.c 8.9 (Berkeley) 6/8/95"; 3636150Scharnier#endif 371556Srgrimes#endif /* not lint */ 3899110Sobrien#include <sys/cdefs.h> 3999110Sobrien__FBSDID("$FreeBSD: stable/9/bin/sh/eval.c 231085 2012-02-06 13:29:50Z dumbbell $"); 401556Srgrimes 41100437Stjr#include <paths.h> 4217987Speter#include <signal.h> 43102576Skeramida#include <stdlib.h> 4417987Speter#include <unistd.h> 45153091Sstefanf#include <sys/resource.h> 4645266Scracauer#include <sys/wait.h> /* For WIFSIGNALED(status) */ 4753891Scracauer#include <errno.h> 4817987Speter 491556Srgrimes/* 501556Srgrimes * Evaluate a command. 511556Srgrimes */ 521556Srgrimes 531556Srgrimes#include "shell.h" 541556Srgrimes#include "nodes.h" 551556Srgrimes#include "syntax.h" 561556Srgrimes#include "expand.h" 571556Srgrimes#include "parser.h" 581556Srgrimes#include "jobs.h" 591556Srgrimes#include "eval.h" 601556Srgrimes#include "builtins.h" 611556Srgrimes#include "options.h" 621556Srgrimes#include "exec.h" 631556Srgrimes#include "redir.h" 641556Srgrimes#include "input.h" 651556Srgrimes#include "output.h" 661556Srgrimes#include "trap.h" 671556Srgrimes#include "var.h" 681556Srgrimes#include "memalloc.h" 691556Srgrimes#include "error.h" 7017987Speter#include "show.h" 711556Srgrimes#include "mystring.h" 7217987Speter#ifndef NO_HISTORY 731556Srgrimes#include "myhistedit.h" 7417987Speter#endif 751556Srgrimes 761556Srgrimes 77201053Sjillesint evalskip; /* set if we are skipping commands */ 78231085Sdumbbellint skipcount; /* number of levels to skip */ 791556SrgrimesMKINIT int loopnest; /* current loop nesting level */ 801556Srgrimesint funcnest; /* depth of function calls */ 81213760Sobrienstatic int builtin_flags; /* evalcommand flags for builtins */ 821556Srgrimes 831556Srgrimes 841556Srgrimeschar *commandname; 851556Srgrimesstruct strlist *cmdenviron; 861556Srgrimesint exitstatus; /* exit status of last command */ 8717987Speterint oexitstatus; /* saved exit status */ 881556Srgrimes 891556Srgrimes 90213811Sobrienstatic void evalloop(union node *, int); 91213811Sobrienstatic void evalfor(union node *, int); 92213811Sobrienstatic void evalcase(union node *, int); 93213811Sobrienstatic void evalsubshell(union node *, int); 94213811Sobrienstatic void evalredir(union node *, int); 95213811Sobrienstatic void expredir(union node *); 96213811Sobrienstatic void evalpipe(union node *); 97216778Sjillesstatic int is_valid_fast_cmdsubst(union node *n); 98213811Sobrienstatic void evalcommand(union node *, int, struct backcmd *); 99213811Sobrienstatic void prehash(union node *); 1001556Srgrimes 1011556Srgrimes 1021556Srgrimes/* 1031556Srgrimes * Called to reset things after an exception. 1041556Srgrimes */ 1051556Srgrimes 1061556Srgrimes#ifdef mkinit 1071556SrgrimesINCLUDE "eval.h" 1081556Srgrimes 1091556SrgrimesRESET { 1101556Srgrimes evalskip = 0; 1111556Srgrimes loopnest = 0; 1121556Srgrimes funcnest = 0; 1131556Srgrimes} 1141556Srgrimes#endif 1151556Srgrimes 1161556Srgrimes 1171556Srgrimes 1181556Srgrimes/* 11946684Skris * The eval command. 1201556Srgrimes */ 1211556Srgrimes 12217987Speterint 12390111Simpevalcmd(int argc, char **argv) 1241556Srgrimes{ 1251556Srgrimes char *p; 1261556Srgrimes char *concat; 1271556Srgrimes char **ap; 1281556Srgrimes 1291556Srgrimes if (argc > 1) { 1301556Srgrimes p = argv[1]; 1311556Srgrimes if (argc > 2) { 1321556Srgrimes STARTSTACKSTR(concat); 1331556Srgrimes ap = argv + 2; 1341556Srgrimes for (;;) { 135215783Sjilles STPUTS(p, concat); 1361556Srgrimes if ((p = *ap++) == NULL) 1371556Srgrimes break; 1381556Srgrimes STPUTC(' ', concat); 1391556Srgrimes } 1401556Srgrimes STPUTC('\0', concat); 1411556Srgrimes p = grabstackstr(concat); 1421556Srgrimes } 143223163Sjilles evalstring(p, builtin_flags); 144210829Sjilles } else 145210829Sjilles exitstatus = 0; 1461556Srgrimes return exitstatus; 1471556Srgrimes} 1481556Srgrimes 1491556Srgrimes 1501556Srgrimes/* 1511556Srgrimes * Execute a command or commands contained in a string. 1521556Srgrimes */ 1531556Srgrimes 1541556Srgrimesvoid 155193169Sstefanfevalstring(char *s, int flags) 15690111Simp{ 1571556Srgrimes union node *n; 1581556Srgrimes struct stackmark smark; 159194128Sjilles int flags_exit; 160210829Sjilles int any; 1611556Srgrimes 162194128Sjilles flags_exit = flags & EV_EXIT; 163194128Sjilles flags &= ~EV_EXIT; 164210829Sjilles any = 0; 1651556Srgrimes setstackmark(&smark); 1661556Srgrimes setinputstring(s, 1); 1671556Srgrimes while ((n = parsecmd(0)) != NEOF) { 168222676Sjilles if (n != NULL && !nflag) { 169194128Sjilles if (flags_exit && preadateof()) 170194128Sjilles evaltree(n, flags | EV_EXIT); 171194128Sjilles else 172194128Sjilles evaltree(n, flags); 173210829Sjilles any = 1; 174194128Sjilles } 1751556Srgrimes popstackmark(&smark); 1761556Srgrimes } 1771556Srgrimes popfile(); 1781556Srgrimes popstackmark(&smark); 179210829Sjilles if (!any) 180210829Sjilles exitstatus = 0; 181194128Sjilles if (flags_exit) 182220978Sjilles exraise(EXEXIT); 1831556Srgrimes} 1841556Srgrimes 1851556Srgrimes 1861556Srgrimes/* 1871556Srgrimes * Evaluate a parse tree. The value is left in the global variable 1881556Srgrimes * exitstatus. 1891556Srgrimes */ 1901556Srgrimes 1911556Srgrimesvoid 19290111Simpevaltree(union node *n, int flags) 19317987Speter{ 194149927Sstefanf int do_etest; 195214599Sjilles union node *next; 196149927Sstefanf 197149927Sstefanf do_etest = 0; 1981556Srgrimes if (n == NULL) { 1991556Srgrimes TRACE(("evaltree(NULL) called\n")); 2001556Srgrimes exitstatus = 0; 2011556Srgrimes goto out; 2021556Srgrimes } 203214599Sjilles do { 204214600Sjilles next = NULL; 20517987Speter#ifndef NO_HISTORY 206214600Sjilles displayhist = 1; /* show history substitutions done with fc */ 20717987Speter#endif 208214600Sjilles TRACE(("evaltree(%p: %d) called\n", (void *)n, n->type)); 209214600Sjilles switch (n->type) { 210214600Sjilles case NSEMI: 211214600Sjilles evaltree(n->nbinary.ch1, flags & ~EV_EXIT); 212214600Sjilles if (evalskip) 213214600Sjilles goto out; 214214600Sjilles next = n->nbinary.ch2; 215214600Sjilles break; 216214600Sjilles case NAND: 217214600Sjilles evaltree(n->nbinary.ch1, EV_TESTED); 218214600Sjilles if (evalskip || exitstatus != 0) { 219214600Sjilles goto out; 220214600Sjilles } 221214600Sjilles next = n->nbinary.ch2; 222214600Sjilles break; 223214600Sjilles case NOR: 224214600Sjilles evaltree(n->nbinary.ch1, EV_TESTED); 225214600Sjilles if (evalskip || exitstatus == 0) 226214600Sjilles goto out; 227214600Sjilles next = n->nbinary.ch2; 228214600Sjilles break; 229214600Sjilles case NREDIR: 230214600Sjilles evalredir(n, flags); 231214600Sjilles break; 232214600Sjilles case NSUBSHELL: 233214600Sjilles evalsubshell(n, flags); 234214600Sjilles do_etest = !(flags & EV_TESTED); 235214600Sjilles break; 236214600Sjilles case NBACKGND: 237214600Sjilles evalsubshell(n, flags); 238214600Sjilles break; 239214600Sjilles case NIF: { 240214600Sjilles evaltree(n->nif.test, EV_TESTED); 241214600Sjilles if (evalskip) 242214600Sjilles goto out; 243214600Sjilles if (exitstatus == 0) 244214600Sjilles next = n->nif.ifpart; 245214600Sjilles else if (n->nif.elsepart) 246214600Sjilles next = n->nif.elsepart; 247214600Sjilles else 248214600Sjilles exitstatus = 0; 249214600Sjilles break; 25018754Ssteve } 251214600Sjilles case NWHILE: 252214600Sjilles case NUNTIL: 253214600Sjilles evalloop(n, flags & ~EV_EXIT); 254214600Sjilles break; 255214600Sjilles case NFOR: 256214600Sjilles evalfor(n, flags & ~EV_EXIT); 257214600Sjilles break; 258214600Sjilles case NCASE: 259214600Sjilles evalcase(n, flags); 260214600Sjilles break; 261214600Sjilles case NDEFUN: 262214600Sjilles defun(n->narg.text, n->narg.next); 26320425Ssteve exitstatus = 0; 264214600Sjilles break; 265214600Sjilles case NNOT: 266214600Sjilles evaltree(n->nnot.com, EV_TESTED); 267214600Sjilles exitstatus = !exitstatus; 268214600Sjilles break; 2691556Srgrimes 270214600Sjilles case NPIPE: 271214600Sjilles evalpipe(n); 272214600Sjilles do_etest = !(flags & EV_TESTED); 273214600Sjilles break; 274214600Sjilles case NCMD: 275214600Sjilles evalcommand(n, flags, (struct backcmd *)NULL); 276214600Sjilles do_etest = !(flags & EV_TESTED); 277214600Sjilles break; 278214600Sjilles default: 279214600Sjilles out1fmt("Node type = %d\n", n->type); 280214600Sjilles flushout(&output); 281214600Sjilles break; 282214600Sjilles } 283214600Sjilles n = next; 284214599Sjilles } while (n != NULL); 2851556Srgrimesout: 2861556Srgrimes if (pendingsigs) 2871556Srgrimes dotrap(); 288220978Sjilles if (eflag && exitstatus != 0 && do_etest) 2891556Srgrimes exitshell(exitstatus); 290220978Sjilles if (flags & EV_EXIT) 291220978Sjilles exraise(EXEXIT); 2921556Srgrimes} 2931556Srgrimes 2941556Srgrimes 295213811Sobrienstatic void 296149933Sstefanfevalloop(union node *n, int flags) 29717987Speter{ 2981556Srgrimes int status; 2991556Srgrimes 3001556Srgrimes loopnest++; 3011556Srgrimes status = 0; 3021556Srgrimes for (;;) { 3031556Srgrimes evaltree(n->nbinary.ch1, EV_TESTED); 3041556Srgrimes if (evalskip) { 3051556Srgrimesskipping: if (evalskip == SKIPCONT && --skipcount <= 0) { 3061556Srgrimes evalskip = 0; 3071556Srgrimes continue; 3081556Srgrimes } 3091556Srgrimes if (evalskip == SKIPBREAK && --skipcount <= 0) 3101556Srgrimes evalskip = 0; 311212475Sjilles if (evalskip == SKIPFUNC || evalskip == SKIPFILE) 312212475Sjilles status = exitstatus; 3131556Srgrimes break; 3141556Srgrimes } 3151556Srgrimes if (n->type == NWHILE) { 3161556Srgrimes if (exitstatus != 0) 3171556Srgrimes break; 3181556Srgrimes } else { 3191556Srgrimes if (exitstatus == 0) 3201556Srgrimes break; 3211556Srgrimes } 322149933Sstefanf evaltree(n->nbinary.ch2, flags); 3231556Srgrimes status = exitstatus; 3241556Srgrimes if (evalskip) 3251556Srgrimes goto skipping; 3261556Srgrimes } 3271556Srgrimes loopnest--; 3281556Srgrimes exitstatus = status; 3291556Srgrimes} 3301556Srgrimes 3311556Srgrimes 3321556Srgrimes 333213811Sobrienstatic void 334149933Sstefanfevalfor(union node *n, int flags) 33517987Speter{ 3361556Srgrimes struct arglist arglist; 3371556Srgrimes union node *argp; 3381556Srgrimes struct strlist *sp; 3391556Srgrimes struct stackmark smark; 3401556Srgrimes 3411556Srgrimes setstackmark(&smark); 3421556Srgrimes arglist.lastp = &arglist.list; 3431556Srgrimes for (argp = n->nfor.args ; argp ; argp = argp->narg.next) { 34417987Speter oexitstatus = exitstatus; 3451556Srgrimes expandarg(argp, &arglist, EXP_FULL | EXP_TILDE); 3461556Srgrimes if (evalskip) 3471556Srgrimes goto out; 3481556Srgrimes } 3491556Srgrimes *arglist.lastp = NULL; 3501556Srgrimes 3511556Srgrimes exitstatus = 0; 3521556Srgrimes loopnest++; 3531556Srgrimes for (sp = arglist.list ; sp ; sp = sp->next) { 3541556Srgrimes setvar(n->nfor.var, sp->text, 0); 355149933Sstefanf evaltree(n->nfor.body, flags); 3561556Srgrimes if (evalskip) { 3571556Srgrimes if (evalskip == SKIPCONT && --skipcount <= 0) { 3581556Srgrimes evalskip = 0; 3591556Srgrimes continue; 3601556Srgrimes } 3611556Srgrimes if (evalskip == SKIPBREAK && --skipcount <= 0) 3621556Srgrimes evalskip = 0; 3631556Srgrimes break; 3641556Srgrimes } 3651556Srgrimes } 3661556Srgrimes loopnest--; 3671556Srgrimesout: 3681556Srgrimes popstackmark(&smark); 3691556Srgrimes} 3701556Srgrimes 3711556Srgrimes 3721556Srgrimes 373213811Sobrienstatic void 37490111Simpevalcase(union node *n, int flags) 37517987Speter{ 3761556Srgrimes union node *cp; 3771556Srgrimes union node *patp; 3781556Srgrimes struct arglist arglist; 3791556Srgrimes struct stackmark smark; 3801556Srgrimes 3811556Srgrimes setstackmark(&smark); 3821556Srgrimes arglist.lastp = &arglist.list; 38317987Speter oexitstatus = exitstatus; 384172440Sstefanf exitstatus = 0; 3851556Srgrimes expandarg(n->ncase.expr, &arglist, EXP_TILDE); 3861556Srgrimes for (cp = n->ncase.cases ; cp && evalskip == 0 ; cp = cp->nclist.next) { 3871556Srgrimes for (patp = cp->nclist.pattern ; patp ; patp = patp->narg.next) { 3881556Srgrimes if (casematch(patp, arglist.list->text)) { 389223186Sjilles while (cp->nclist.next && 390223186Sjilles cp->type == NCLISTFALLTHRU) { 391223186Sjilles if (evalskip != 0) 392223186Sjilles break; 393223186Sjilles evaltree(cp->nclist.body, 394223186Sjilles flags & ~EV_EXIT); 395223186Sjilles cp = cp->nclist.next; 396223186Sjilles } 3971556Srgrimes if (evalskip == 0) { 3981556Srgrimes evaltree(cp->nclist.body, flags); 3991556Srgrimes } 4001556Srgrimes goto out; 4011556Srgrimes } 4021556Srgrimes } 4031556Srgrimes } 4041556Srgrimesout: 4051556Srgrimes popstackmark(&smark); 4061556Srgrimes} 4071556Srgrimes 4081556Srgrimes 4091556Srgrimes 4101556Srgrimes/* 4111556Srgrimes * Kick off a subshell to evaluate a tree. 4121556Srgrimes */ 4131556Srgrimes 414213811Sobrienstatic void 41590111Simpevalsubshell(union node *n, int flags) 41617987Speter{ 4171556Srgrimes struct job *jp; 4181556Srgrimes int backgnd = (n->type == NBACKGND); 4191556Srgrimes 420222716Sjilles oexitstatus = exitstatus; 4211556Srgrimes expredir(n->nredir.redirect); 422194774Sjilles if ((!backgnd && flags & EV_EXIT && !have_traps()) || 423194774Sjilles forkshell(jp = makejob(n, 1), n, backgnd) == 0) { 4241556Srgrimes if (backgnd) 4251556Srgrimes flags &=~ EV_TESTED; 4261556Srgrimes redirect(n->nredir.redirect, 0); 4271556Srgrimes evaltree(n->nredir.n, flags | EV_EXIT); /* never returns */ 428201053Sjilles } else if (! backgnd) { 4291556Srgrimes INTOFF; 43045916Scracauer exitstatus = waitforjob(jp, (int *)NULL); 4311556Srgrimes INTON; 432221027Sjilles } else 433221027Sjilles exitstatus = 0; 4341556Srgrimes} 4351556Srgrimes 4361556Srgrimes 437205154Sjilles/* 438205154Sjilles * Evaluate a redirected compound command. 439205154Sjilles */ 4401556Srgrimes 441213811Sobrienstatic void 442205154Sjillesevalredir(union node *n, int flags) 443205154Sjilles{ 444205154Sjilles struct jmploc jmploc; 445205154Sjilles struct jmploc *savehandler; 446205154Sjilles volatile int in_redirect = 1; 447205154Sjilles 448222716Sjilles oexitstatus = exitstatus; 449205154Sjilles expredir(n->nredir.redirect); 450205154Sjilles savehandler = handler; 451205154Sjilles if (setjmp(jmploc.loc)) { 452205154Sjilles int e; 453205154Sjilles 454205154Sjilles handler = savehandler; 455205154Sjilles e = exception; 456220978Sjilles popredir(); 457205154Sjilles if (e == EXERROR || e == EXEXEC) { 458205154Sjilles if (in_redirect) { 459205154Sjilles exitstatus = 2; 460205154Sjilles return; 461205154Sjilles } 462205154Sjilles } 463205154Sjilles longjmp(handler->loc, 1); 464205154Sjilles } else { 465205154Sjilles INTOFF; 466205154Sjilles handler = &jmploc; 467205154Sjilles redirect(n->nredir.redirect, REDIR_PUSH); 468205154Sjilles in_redirect = 0; 469205154Sjilles INTON; 470205154Sjilles evaltree(n->nredir.n, flags); 471205154Sjilles } 472205154Sjilles INTOFF; 473205154Sjilles handler = savehandler; 474205154Sjilles popredir(); 475205154Sjilles INTON; 476205154Sjilles} 477205154Sjilles 478205154Sjilles 4791556Srgrimes/* 4801556Srgrimes * Compute the names of the files in a redirection list. 4811556Srgrimes */ 4821556Srgrimes 483213811Sobrienstatic void 48490111Simpexpredir(union node *n) 48517987Speter{ 48625222Ssteve union node *redir; 4871556Srgrimes 4881556Srgrimes for (redir = n ; redir ; redir = redir->nfile.next) { 48917987Speter struct arglist fn; 49017987Speter fn.lastp = &fn.list; 49117987Speter switch (redir->type) { 49217987Speter case NFROM: 49317987Speter case NTO: 49466612Sbrian case NFROMTO: 49517987Speter case NAPPEND: 49696922Stjr case NCLOBBER: 4971556Srgrimes expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR); 4981556Srgrimes redir->nfile.expfname = fn.list->text; 49917987Speter break; 50017987Speter case NFROMFD: 50117987Speter case NTOFD: 50217987Speter if (redir->ndup.vname) { 503181017Sstefanf expandarg(redir->ndup.vname, &fn, EXP_TILDE | EXP_REDIR); 50417987Speter fixredir(redir, fn.list->text, 1); 50517987Speter } 50617987Speter break; 5071556Srgrimes } 5081556Srgrimes } 5091556Srgrimes} 5101556Srgrimes 5111556Srgrimes 5121556Srgrimes 5131556Srgrimes/* 5141556Srgrimes * Evaluate a pipeline. All the processes in the pipeline are children 5151556Srgrimes * of the process creating the pipeline. (This differs from some versions 5161556Srgrimes * of the shell, which make the last process in a pipeline the parent 5171556Srgrimes * of all the rest.) 5181556Srgrimes */ 5191556Srgrimes 520213811Sobrienstatic void 52190111Simpevalpipe(union node *n) 52217987Speter{ 5231556Srgrimes struct job *jp; 5241556Srgrimes struct nodelist *lp; 5251556Srgrimes int pipelen; 5261556Srgrimes int prevfd; 5271556Srgrimes int pip[2]; 5281556Srgrimes 529149802Sstefanf TRACE(("evalpipe(%p) called\n", (void *)n)); 5301556Srgrimes pipelen = 0; 5311556Srgrimes for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) 5321556Srgrimes pipelen++; 5331556Srgrimes INTOFF; 5341556Srgrimes jp = makejob(n, pipelen); 5351556Srgrimes prevfd = -1; 5361556Srgrimes for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { 5371556Srgrimes prehash(lp->n); 5381556Srgrimes pip[1] = -1; 5391556Srgrimes if (lp->next) { 5401556Srgrimes if (pipe(pip) < 0) { 5411556Srgrimes close(prevfd); 54253891Scracauer error("Pipe call failed: %s", strerror(errno)); 5431556Srgrimes } 5441556Srgrimes } 5451556Srgrimes if (forkshell(jp, lp->n, n->npipe.backgnd) == 0) { 5461556Srgrimes INTON; 5471556Srgrimes if (prevfd > 0) { 548124780Sdes dup2(prevfd, 0); 5491556Srgrimes close(prevfd); 5501556Srgrimes } 5511556Srgrimes if (pip[1] >= 0) { 55253282Scracauer if (!(prevfd >= 0 && pip[0] == 0)) 55352900Scracauer close(pip[0]); 5541556Srgrimes if (pip[1] != 1) { 555124780Sdes dup2(pip[1], 1); 5561556Srgrimes close(pip[1]); 5571556Srgrimes } 5581556Srgrimes } 5591556Srgrimes evaltree(lp->n, EV_EXIT); 5601556Srgrimes } 5611556Srgrimes if (prevfd >= 0) 5621556Srgrimes close(prevfd); 5631556Srgrimes prevfd = pip[0]; 564221970Sjilles if (pip[1] != -1) 565221970Sjilles close(pip[1]); 5661556Srgrimes } 5671556Srgrimes INTON; 5681556Srgrimes if (n->npipe.backgnd == 0) { 5691556Srgrimes INTOFF; 57045916Scracauer exitstatus = waitforjob(jp, (int *)NULL); 5711556Srgrimes TRACE(("evalpipe: job done exit status %d\n", exitstatus)); 5721556Srgrimes INTON; 573221027Sjilles } else 574221027Sjilles exitstatus = 0; 5751556Srgrimes} 5761556Srgrimes 5771556Srgrimes 5781556Srgrimes 579216778Sjillesstatic int 580216778Sjillesis_valid_fast_cmdsubst(union node *n) 581216778Sjilles{ 582216778Sjilles 583223024Sjilles return (n->type == NCMD); 584216778Sjilles} 585216778Sjilles 5861556Srgrimes/* 5871556Srgrimes * Execute a command inside back quotes. If it's a builtin command, we 5881556Srgrimes * want to save its output in a block obtained from malloc. Otherwise 5891556Srgrimes * we fork off a subprocess and get the output of the command via a pipe. 5901556Srgrimes * Should be called with interrupts off. 5911556Srgrimes */ 5921556Srgrimes 5931556Srgrimesvoid 59490111Simpevalbackcmd(union node *n, struct backcmd *result) 59517987Speter{ 5961556Srgrimes int pip[2]; 5971556Srgrimes struct job *jp; 5981556Srgrimes struct stackmark smark; /* unnecessary */ 599216761Sjilles struct jmploc jmploc; 600216761Sjilles struct jmploc *savehandler; 601223024Sjilles struct localvar *savelocalvars; 6021556Srgrimes 6031556Srgrimes setstackmark(&smark); 6041556Srgrimes result->fd = -1; 6051556Srgrimes result->buf = NULL; 6061556Srgrimes result->nleft = 0; 6071556Srgrimes result->jp = NULL; 60817987Speter if (n == NULL) { 60917987Speter exitstatus = 0; 6101556Srgrimes goto out; 61117987Speter } 612216778Sjilles if (is_valid_fast_cmdsubst(n)) { 61317987Speter exitstatus = oexitstatus; 614223024Sjilles savelocalvars = localvars; 615223024Sjilles localvars = NULL; 616223024Sjilles forcelocal++; 617216761Sjilles savehandler = handler; 618216761Sjilles if (setjmp(jmploc.loc)) { 619216761Sjilles if (exception == EXERROR || exception == EXEXEC) 620216761Sjilles exitstatus = 2; 621216761Sjilles else if (exception != 0) { 622216761Sjilles handler = savehandler; 623223024Sjilles forcelocal--; 624223024Sjilles poplocalvars(); 625223024Sjilles localvars = savelocalvars; 626216761Sjilles longjmp(handler->loc, 1); 627216761Sjilles } 628216761Sjilles } else { 629216761Sjilles handler = &jmploc; 630216761Sjilles evalcommand(n, EV_BACKCMD, result); 631216761Sjilles } 632216761Sjilles handler = savehandler; 633223024Sjilles forcelocal--; 634223024Sjilles poplocalvars(); 635223024Sjilles localvars = savelocalvars; 6361556Srgrimes } else { 63717987Speter exitstatus = 0; 6381556Srgrimes if (pipe(pip) < 0) 63953891Scracauer error("Pipe call failed: %s", strerror(errno)); 6401556Srgrimes jp = makejob(n, 1); 6411556Srgrimes if (forkshell(jp, n, FORK_NOJOB) == 0) { 6421556Srgrimes FORCEINTON; 6431556Srgrimes close(pip[0]); 6441556Srgrimes if (pip[1] != 1) { 645124780Sdes dup2(pip[1], 1); 6461556Srgrimes close(pip[1]); 6471556Srgrimes } 6481556Srgrimes evaltree(n, EV_EXIT); 6491556Srgrimes } 6501556Srgrimes close(pip[1]); 6511556Srgrimes result->fd = pip[0]; 6521556Srgrimes result->jp = jp; 6531556Srgrimes } 6541556Srgrimesout: 6551556Srgrimes popstackmark(&smark); 656109627Stjr TRACE(("evalbackcmd done: fd=%d buf=%p nleft=%d jp=%p\n", 6571556Srgrimes result->fd, result->buf, result->nleft, result->jp)); 6581556Srgrimes} 6591556Srgrimes 660216826Sjilles/* 661216826Sjilles * Check if a builtin can safely be executed in the same process, 662216826Sjilles * even though it should be in a subshell (command substitution). 663216826Sjilles * Note that jobid, jobs, times and trap can show information not 664216826Sjilles * available in a child process; this is deliberate. 665216826Sjilles * The arguments should already have been expanded. 666216826Sjilles */ 667216826Sjillesstatic int 668216826Sjillessafe_builtin(int idx, int argc, char **argv) 669216826Sjilles{ 670216826Sjilles if (idx == BLTINCMD || idx == COMMANDCMD || idx == ECHOCMD || 671216826Sjilles idx == FALSECMD || idx == JOBIDCMD || idx == JOBSCMD || 672216826Sjilles idx == KILLCMD || idx == PRINTFCMD || idx == PWDCMD || 673216826Sjilles idx == TESTCMD || idx == TIMESCMD || idx == TRUECMD || 674216826Sjilles idx == TYPECMD) 675216826Sjilles return (1); 676216826Sjilles if (idx == EXPORTCMD || idx == TRAPCMD || idx == ULIMITCMD || 677216826Sjilles idx == UMASKCMD) 678216826Sjilles return (argc <= 1 || (argc == 2 && argv[1][0] == '-')); 679216826Sjilles if (idx == SETCMD) 680216826Sjilles return (argc <= 1 || (argc == 2 && (argv[1][0] == '-' || 681216826Sjilles argv[1][0] == '+') && argv[1][1] == 'o' && 682216826Sjilles argv[1][2] == '\0')); 683216826Sjilles return (0); 684216826Sjilles} 6851556Srgrimes 6861556Srgrimes/* 6871556Srgrimes * Execute a simple command. 688217035Sjilles * Note: This may or may not return if (flags & EV_EXIT). 6891556Srgrimes */ 6901556Srgrimes 691213811Sobrienstatic void 69290111Simpevalcommand(union node *cmd, int flags, struct backcmd *backcmd) 69317987Speter{ 6941556Srgrimes struct stackmark smark; 6951556Srgrimes union node *argp; 6961556Srgrimes struct arglist arglist; 6971556Srgrimes struct arglist varlist; 6981556Srgrimes char **argv; 6991556Srgrimes int argc; 7001556Srgrimes char **envp; 7011556Srgrimes int varflag; 7021556Srgrimes struct strlist *sp; 7031556Srgrimes int mode; 7041556Srgrimes int pip[2]; 7051556Srgrimes struct cmdentry cmdentry; 7061556Srgrimes struct job *jp; 7071556Srgrimes struct jmploc jmploc; 708194765Sjilles struct jmploc *savehandler; 709194765Sjilles char *savecmdname; 710194765Sjilles struct shparam saveparam; 711194765Sjilles struct localvar *savelocalvars; 712199647Sjilles struct parsefile *savetopfile; 7131556Srgrimes volatile int e; 7141556Srgrimes char *lastarg; 71545916Scracauer int realstatus; 71654884Scracauer int do_clearcmdentry; 717211287Sjilles const char *path = pathval(); 7181556Srgrimes 7191556Srgrimes /* First expand the arguments. */ 720149802Sstefanf TRACE(("evalcommand(%p, %d) called\n", (void *)cmd, flags)); 7211556Srgrimes setstackmark(&smark); 7221556Srgrimes arglist.lastp = &arglist.list; 7231556Srgrimes varlist.lastp = &varlist.list; 7241556Srgrimes varflag = 1; 725217035Sjilles jp = NULL; 72654884Scracauer do_clearcmdentry = 0; 72717987Speter oexitstatus = exitstatus; 72817987Speter exitstatus = 0; 7291556Srgrimes for (argp = cmd->ncmd.args ; argp ; argp = argp->narg.next) { 730222165Sjilles if (varflag && isassignment(argp->narg.text)) { 731222165Sjilles expandarg(argp, &varlist, EXP_VARTILDE); 732222165Sjilles continue; 7331556Srgrimes } 7341556Srgrimes expandarg(argp, &arglist, EXP_FULL | EXP_TILDE); 7351556Srgrimes varflag = 0; 7361556Srgrimes } 7371556Srgrimes *arglist.lastp = NULL; 7381556Srgrimes *varlist.lastp = NULL; 7391556Srgrimes expredir(cmd->ncmd.redirect); 7401556Srgrimes argc = 0; 7411556Srgrimes for (sp = arglist.list ; sp ; sp = sp->next) 7421556Srgrimes argc++; 743218306Sjilles /* Add one slot at the beginning for tryexec(). */ 744218306Sjilles argv = stalloc(sizeof (char *) * (argc + 2)); 745218306Sjilles argv++; 7461556Srgrimes 7471556Srgrimes for (sp = arglist.list ; sp ; sp = sp->next) { 7481556Srgrimes TRACE(("evalcommand arg: %s\n", sp->text)); 7491556Srgrimes *argv++ = sp->text; 7501556Srgrimes } 7511556Srgrimes *argv = NULL; 7521556Srgrimes lastarg = NULL; 7531556Srgrimes if (iflag && funcnest == 0 && argc > 0) 7541556Srgrimes lastarg = argv[-1]; 7551556Srgrimes argv -= argc; 7561556Srgrimes 7571556Srgrimes /* Print the command if xflag is set. */ 7581556Srgrimes if (xflag) { 759159632Sstefanf char sep = 0; 760222907Sjilles const char *p, *ps4; 761222907Sjilles ps4 = expandstr(ps4val()); 762222907Sjilles out2str(ps4 != NULL ? ps4 : ps4val()); 7631556Srgrimes for (sp = varlist.list ; sp ; sp = sp->next) { 764159632Sstefanf if (sep != 0) 765201366Sjilles out2c(' '); 766215567Sjilles p = strchr(sp->text, '='); 767215567Sjilles if (p != NULL) { 768215567Sjilles p++; 769215567Sjilles outbin(sp->text, p - sp->text, out2); 770194786Sjilles out2qstr(p); 771215567Sjilles } else 772215567Sjilles out2qstr(sp->text); 773159632Sstefanf sep = ' '; 7741556Srgrimes } 7751556Srgrimes for (sp = arglist.list ; sp ; sp = sp->next) { 776159632Sstefanf if (sep != 0) 777201366Sjilles out2c(' '); 778194786Sjilles /* Disambiguate command looking like assignment. */ 779194786Sjilles if (sp == arglist.list && 780194786Sjilles strchr(sp->text, '=') != NULL && 781194786Sjilles strchr(sp->text, '\'') == NULL) { 782194786Sjilles out2c('\''); 783194786Sjilles out2str(sp->text); 784194786Sjilles out2c('\''); 785194786Sjilles } else 786194786Sjilles out2qstr(sp->text); 787159632Sstefanf sep = ' '; 7881556Srgrimes } 789201366Sjilles out2c('\n'); 7901556Srgrimes flushout(&errout); 7911556Srgrimes } 7921556Srgrimes 7931556Srgrimes /* Now locate the command. */ 7941556Srgrimes if (argc == 0) { 795157601Sstefanf /* Variable assignment(s) without command */ 7961556Srgrimes cmdentry.cmdtype = CMDBUILTIN; 7971556Srgrimes cmdentry.u.index = BLTINCMD; 798205138Sjilles cmdentry.special = 0; 7991556Srgrimes } else { 80017987Speter static const char PATH[] = "PATH="; 801204800Sjilles int cmd_flags = 0, bltinonly = 0; 80217987Speter 80317987Speter /* 80417987Speter * Modify the command lookup path, if a PATH= assignment 80517987Speter * is present 80617987Speter */ 80717987Speter for (sp = varlist.list ; sp ; sp = sp->next) 80854884Scracauer if (strncmp(sp->text, PATH, sizeof(PATH) - 1) == 0) { 80917987Speter path = sp->text + sizeof(PATH) - 1; 810155301Sschweikh /* 81154884Scracauer * On `PATH=... command`, we need to make 81254884Scracauer * sure that the command isn't using the 81354884Scracauer * non-updated hash table of the outer PATH 814155301Sschweikh * setting and we need to make sure that 81554884Scracauer * the hash table isn't filled with items 81654884Scracauer * from the temporary setting. 81754884Scracauer * 818155301Sschweikh * It would be better to forbit using and 81954884Scracauer * updating the table while this command 82054884Scracauer * runs, by the command finding mechanism 82154884Scracauer * is heavily integrated with hash handling, 82254884Scracauer * so we just delete the hash before and after 82354884Scracauer * the command runs. Partly deleting like 82454884Scracauer * changepatch() does doesn't seem worth the 82554884Scracauer * bookinging effort, since most such runs add 826123996Smaxim * directories in front of the new PATH. 82754884Scracauer */ 828218324Sjilles clearcmdentry(); 82954884Scracauer do_clearcmdentry = 1; 83054884Scracauer } 83117987Speter 832204800Sjilles for (;;) { 833204800Sjilles if (bltinonly) { 834204800Sjilles cmdentry.u.index = find_builtin(*argv, &cmdentry.special); 835204800Sjilles if (cmdentry.u.index < 0) { 836201431Sjilles cmdentry.u.index = BLTINCMD; 837201431Sjilles argv--; 838201431Sjilles argc++; 839201431Sjilles break; 8401556Srgrimes } 841204800Sjilles } else 842204800Sjilles find_command(argv[0], &cmdentry, cmd_flags, path); 843204800Sjilles /* implement the bltin and command builtins here */ 844204800Sjilles if (cmdentry.cmdtype != CMDBUILTIN) 845204800Sjilles break; 846204800Sjilles if (cmdentry.u.index == BLTINCMD) { 847204800Sjilles if (argc == 1) 8481556Srgrimes break; 849204800Sjilles argv++; 850204800Sjilles argc--; 851204800Sjilles bltinonly = 1; 852204800Sjilles } else if (cmdentry.u.index == COMMANDCMD) { 853204800Sjilles if (argc == 1) 854204800Sjilles break; 855204800Sjilles if (!strcmp(argv[1], "-p")) { 856204800Sjilles if (argc == 2) 857204800Sjilles break; 858204800Sjilles if (argv[2][0] == '-') { 859204800Sjilles if (strcmp(argv[2], "--")) 860204800Sjilles break; 861204800Sjilles if (argc == 3) 862204800Sjilles break; 863204800Sjilles argv += 3; 864204800Sjilles argc -= 3; 865204800Sjilles } else { 866204800Sjilles argv += 2; 867204800Sjilles argc -= 2; 868204800Sjilles } 869204800Sjilles path = _PATH_STDPATH; 870218324Sjilles clearcmdentry(); 871204800Sjilles do_clearcmdentry = 1; 872204800Sjilles } else if (!strcmp(argv[1], "--")) { 873204800Sjilles if (argc == 2) 874204800Sjilles break; 875204800Sjilles argv += 2; 876204800Sjilles argc -= 2; 877204800Sjilles } else if (argv[1][0] == '-') 878204800Sjilles break; 879204800Sjilles else { 880204800Sjilles argv++; 881204800Sjilles argc--; 882204800Sjilles } 883204800Sjilles cmd_flags |= DO_NOFUNC; 884204800Sjilles bltinonly = 0; 885204800Sjilles } else 886204800Sjilles break; 8871556Srgrimes } 888204800Sjilles /* 889204800Sjilles * Special builtins lose their special properties when 890204800Sjilles * called via 'command'. 891204800Sjilles */ 892204800Sjilles if (cmd_flags & DO_NOFUNC) 893204800Sjilles cmdentry.special = 0; 8941556Srgrimes } 8951556Srgrimes 8961556Srgrimes /* Fork off a child process if necessary. */ 897223282Sjilles if (((cmdentry.cmdtype == CMDNORMAL || cmdentry.cmdtype == CMDUNKNOWN) 898194127Sjilles && ((flags & EV_EXIT) == 0 || have_traps())) 89917987Speter || ((flags & EV_BACKCMD) != 0 900216826Sjilles && (cmdentry.cmdtype != CMDBUILTIN || 901216826Sjilles !safe_builtin(cmdentry.u.index, argc, argv)))) { 9021556Srgrimes jp = makejob(cmd, 1); 903223282Sjilles mode = FORK_FG; 9041556Srgrimes if (flags & EV_BACKCMD) { 9051556Srgrimes mode = FORK_NOJOB; 9061556Srgrimes if (pipe(pip) < 0) 90753891Scracauer error("Pipe call failed: %s", strerror(errno)); 9081556Srgrimes } 9091556Srgrimes if (forkshell(jp, cmd, mode) != 0) 9101556Srgrimes goto parent; /* at end of routine */ 9111556Srgrimes if (flags & EV_BACKCMD) { 9121556Srgrimes FORCEINTON; 9131556Srgrimes close(pip[0]); 9141556Srgrimes if (pip[1] != 1) { 915124780Sdes dup2(pip[1], 1); 9161556Srgrimes close(pip[1]); 9171556Srgrimes } 918223163Sjilles flags &= ~EV_BACKCMD; 9191556Srgrimes } 9201556Srgrimes flags |= EV_EXIT; 9211556Srgrimes } 9221556Srgrimes 9231556Srgrimes /* This is the child process if a fork occurred. */ 9241556Srgrimes /* Execute the command. */ 9251556Srgrimes if (cmdentry.cmdtype == CMDFUNCTION) { 92620425Ssteve#ifdef DEBUG 9271556Srgrimes trputs("Shell function: "); trargs(argv); 92820425Ssteve#endif 9291556Srgrimes saveparam = shellparam; 9301556Srgrimes shellparam.malloc = 0; 93120425Ssteve shellparam.reset = 1; 9321556Srgrimes shellparam.nparam = argc - 1; 9331556Srgrimes shellparam.p = argv + 1; 9341556Srgrimes shellparam.optnext = NULL; 9351556Srgrimes INTOFF; 9361556Srgrimes savelocalvars = localvars; 9371556Srgrimes localvars = NULL; 938196483Sjilles reffunc(cmdentry.u.func); 939194765Sjilles savehandler = handler; 9401556Srgrimes if (setjmp(jmploc.loc)) { 941218306Sjilles freeparam(&shellparam); 942218306Sjilles shellparam = saveparam; 943220978Sjilles popredir(); 944196483Sjilles unreffunc(cmdentry.u.func); 9451556Srgrimes poplocalvars(); 9461556Srgrimes localvars = savelocalvars; 947201283Sjilles funcnest--; 9481556Srgrimes handler = savehandler; 9491556Srgrimes longjmp(handler->loc, 1); 9501556Srgrimes } 9511556Srgrimes handler = &jmploc; 952201283Sjilles funcnest++; 953204802Sjilles redirect(cmd->ncmd.redirect, REDIR_PUSH); 954199660Sjilles INTON; 9551556Srgrimes for (sp = varlist.list ; sp ; sp = sp->next) 9561556Srgrimes mklocal(sp->text); 957185231Sstefanf exitstatus = oexitstatus; 958220978Sjilles evaltree(getfuncnode(cmdentry.u.func), 959220978Sjilles flags & (EV_TESTED | EV_EXIT)); 9601556Srgrimes INTOFF; 961196483Sjilles unreffunc(cmdentry.u.func); 9621556Srgrimes poplocalvars(); 9631556Srgrimes localvars = savelocalvars; 9641556Srgrimes freeparam(&shellparam); 9651556Srgrimes shellparam = saveparam; 9661556Srgrimes handler = savehandler; 967201283Sjilles funcnest--; 9681556Srgrimes popredir(); 9691556Srgrimes INTON; 9701556Srgrimes if (evalskip == SKIPFUNC) { 9711556Srgrimes evalskip = 0; 9721556Srgrimes skipcount = 0; 9731556Srgrimes } 974217035Sjilles if (jp) 9751556Srgrimes exitshell(exitstatus); 9761556Srgrimes } else if (cmdentry.cmdtype == CMDBUILTIN) { 97720425Ssteve#ifdef DEBUG 9781556Srgrimes trputs("builtin command: "); trargs(argv); 97920425Ssteve#endif 9801556Srgrimes mode = (cmdentry.u.index == EXECCMD)? 0 : REDIR_PUSH; 9811556Srgrimes if (flags == EV_BACKCMD) { 9821556Srgrimes memout.nleft = 0; 9831556Srgrimes memout.nextc = memout.buf; 9841556Srgrimes memout.bufsize = 64; 9851556Srgrimes mode |= REDIR_BACKQ; 9861556Srgrimes } 9871556Srgrimes savecmdname = commandname; 988199647Sjilles savetopfile = getcurrentfile(); 9891556Srgrimes cmdenviron = varlist.list; 9901556Srgrimes e = -1; 991194765Sjilles savehandler = handler; 9921556Srgrimes if (setjmp(jmploc.loc)) { 9931556Srgrimes e = exception; 994220978Sjilles if (e == EXINT) 995220978Sjilles exitstatus = SIGINT+128; 996220978Sjilles else if (e != EXEXIT) 997220978Sjilles exitstatus = 2; 9981556Srgrimes goto cmddone; 9991556Srgrimes } 10001556Srgrimes handler = &jmploc; 1001157601Sstefanf redirect(cmd->ncmd.redirect, mode); 1002205138Sjilles /* 1003205138Sjilles * If there is no command word, redirection errors should 1004205138Sjilles * not be fatal but assignment errors should. 1005205138Sjilles */ 1006230625Sjilles if (argc == 0) 1007205138Sjilles cmdentry.special = 1; 1008216870Sjilles listsetvar(cmdenviron, cmdentry.special ? 0 : VNOSET); 1009207678Sjilles if (argc > 0) 1010207678Sjilles bltinsetlocale(); 10111556Srgrimes commandname = argv[0]; 10121556Srgrimes argptr = argv + 1; 1013201053Sjilles nextopt_optptr = NULL; /* initialize nextopt */ 1014193169Sstefanf builtin_flags = flags; 10151556Srgrimes exitstatus = (*builtinfunc[cmdentry.u.index])(argc, argv); 10161556Srgrimes flushall(); 10171556Srgrimescmddone: 1018207678Sjilles if (argc > 0) 1019207678Sjilles bltinunsetlocale(); 102060592Scracauer cmdenviron = NULL; 10211556Srgrimes out1 = &output; 10221556Srgrimes out2 = &errout; 10231556Srgrimes freestdout(); 1024217035Sjilles handler = savehandler; 1025218306Sjilles commandname = savecmdname; 1026218306Sjilles if (jp) 1027218306Sjilles exitshell(exitstatus); 1028201366Sjilles if (flags == EV_BACKCMD) { 1029201366Sjilles backcmd->buf = memout.buf; 1030201366Sjilles backcmd->nleft = memout.nextc - memout.buf; 1031201366Sjilles memout.buf = NULL; 1032201366Sjilles } 1033220978Sjilles if (cmdentry.u.index != EXECCMD) 1034204801Sjilles popredir(); 10351556Srgrimes if (e != -1) { 103620425Ssteve if ((e != EXERROR && e != EXEXEC) 1037157601Sstefanf || cmdentry.special) 10381556Srgrimes exraise(e); 1039199647Sjilles popfilesupto(savetopfile); 1040201366Sjilles if (flags != EV_BACKCMD) 1041201366Sjilles FORCEINTON; 10421556Srgrimes } 10431556Srgrimes } else { 104420425Ssteve#ifdef DEBUG 10451556Srgrimes trputs("normal command: "); trargs(argv); 104620425Ssteve#endif 10471556Srgrimes redirect(cmd->ncmd.redirect, 0); 10481556Srgrimes for (sp = varlist.list ; sp ; sp = sp->next) 10491556Srgrimes setvareq(sp->text, VEXPORT|VSTACK); 10501556Srgrimes envp = environment(); 1051204800Sjilles shellexec(argv, envp, path, cmdentry.u.index); 10521556Srgrimes /*NOTREACHED*/ 10531556Srgrimes } 10541556Srgrimes goto out; 10551556Srgrimes 10561556Srgrimesparent: /* parent process gets here (if we forked) */ 1057212214Sjilles if (mode == FORK_FG) { /* argument to fork */ 10581556Srgrimes INTOFF; 105945916Scracauer exitstatus = waitforjob(jp, &realstatus); 10601556Srgrimes INTON; 106145916Scracauer if (iflag && loopnest > 0 && WIFSIGNALED(realstatus)) { 106245266Scracauer evalskip = SKIPBREAK; 106345266Scracauer skipcount = loopnest; 106445266Scracauer } 1065212214Sjilles } else if (mode == FORK_NOJOB) { 10661556Srgrimes backcmd->fd = pip[0]; 10671556Srgrimes close(pip[1]); 10681556Srgrimes backcmd->jp = jp; 1069223282Sjilles } 10701556Srgrimes 10711556Srgrimesout: 10721556Srgrimes if (lastarg) 10731556Srgrimes setvar("_", lastarg, 0); 107454884Scracauer if (do_clearcmdentry) 1075218324Sjilles clearcmdentry(); 10761556Srgrimes popstackmark(&smark); 10771556Srgrimes} 10781556Srgrimes 10791556Srgrimes 10801556Srgrimes 10811556Srgrimes/* 10821556Srgrimes * Search for a command. This is called before we fork so that the 10831556Srgrimes * location of the command will be available in the parent as well as 10841556Srgrimes * the child. The check for "goodname" is an overly conservative 10851556Srgrimes * check that the name will not be subject to expansion. 10861556Srgrimes */ 10871556Srgrimes 1088213811Sobrienstatic void 108990111Simpprehash(union node *n) 109017987Speter{ 10911556Srgrimes struct cmdentry entry; 10921556Srgrimes 1093159633Sstefanf if (n && n->type == NCMD && n->ncmd.args) 109417987Speter if (goodname(n->ncmd.args->narg.text)) 109517987Speter find_command(n->ncmd.args->narg.text, &entry, 0, 109617987Speter pathval()); 10971556Srgrimes} 10981556Srgrimes 10991556Srgrimes 11001556Srgrimes 11011556Srgrimes/* 11021556Srgrimes * Builtin commands. Builtin commands whose functions are closely 11031556Srgrimes * tied to evaluation are implemented here. 11041556Srgrimes */ 11051556Srgrimes 11061556Srgrimes/* 1107201431Sjilles * No command given, a bltin command with no arguments, or a bltin command 1108201431Sjilles * with an invalid name. 11091556Srgrimes */ 11101556Srgrimes 111117987Speterint 1112201431Sjillesbltincmd(int argc, char **argv) 111317987Speter{ 1114201431Sjilles if (argc > 1) { 1115201431Sjilles out2fmt_flush("%s: not found\n", argv[1]); 1116201431Sjilles return 127; 1117201431Sjilles } 111820425Ssteve /* 111917987Speter * Preserve exitstatus of a previous possible redirection 112020425Ssteve * as POSIX mandates 112117987Speter */ 11221556Srgrimes return exitstatus; 11231556Srgrimes} 11241556Srgrimes 11251556Srgrimes 11261556Srgrimes/* 11271556Srgrimes * Handle break and continue commands. Break, continue, and return are 11281556Srgrimes * all handled by setting the evalskip flag. The evaluation routines 11291556Srgrimes * above all check this flag, and if it is set they start skipping 11301556Srgrimes * commands rather than executing them. The variable skipcount is 11311556Srgrimes * the number of loops to break/continue, or the number of function 11321556Srgrimes * levels to return. (The latter is always 1.) It should probably 11331556Srgrimes * be an error to break out of more loops than exist, but it isn't 11341556Srgrimes * in the standard shell so we don't make it one here. 11351556Srgrimes */ 11361556Srgrimes 113717987Speterint 113890111Simpbreakcmd(int argc, char **argv) 113917987Speter{ 114020425Ssteve int n = argc > 1 ? number(argv[1]) : 1; 11411556Srgrimes 11421556Srgrimes if (n > loopnest) 11431556Srgrimes n = loopnest; 11441556Srgrimes if (n > 0) { 11451556Srgrimes evalskip = (**argv == 'c')? SKIPCONT : SKIPBREAK; 11461556Srgrimes skipcount = n; 11471556Srgrimes } 11481556Srgrimes return 0; 11491556Srgrimes} 11501556Srgrimes 1151100437Stjr/* 1152100437Stjr * The `command' command. 1153100437Stjr */ 1154100437Stjrint 1155100437Stjrcommandcmd(int argc, char **argv) 1156100437Stjr{ 1157207783Sjilles const char *path; 1158100437Stjr int ch; 1159151810Sstefanf int cmd = -1; 11601556Srgrimes 1161204800Sjilles path = bltinlookup("PATH", 1); 1162100437Stjr 1163100437Stjr optind = optreset = 1; 1164100663Stjr opterr = 0; 1165151810Sstefanf while ((ch = getopt(argc, argv, "pvV")) != -1) { 1166100437Stjr switch (ch) { 1167100437Stjr case 'p': 1168207783Sjilles path = _PATH_STDPATH; 1169100437Stjr break; 1170151810Sstefanf case 'v': 1171151810Sstefanf cmd = TYPECMD_SMALLV; 1172151810Sstefanf break; 1173151810Sstefanf case 'V': 1174151810Sstefanf cmd = TYPECMD_BIGV; 1175151810Sstefanf break; 1176100437Stjr case '?': 1177100437Stjr default: 1178100437Stjr error("unknown option: -%c", optopt); 1179100437Stjr } 1180100437Stjr } 1181100437Stjr argc -= optind; 1182100437Stjr argv += optind; 1183100437Stjr 1184151810Sstefanf if (cmd != -1) { 1185151810Sstefanf if (argc != 1) 1186151810Sstefanf error("wrong number of arguments"); 1187201343Sjilles return typecmd_impl(2, argv - 1, cmd, path); 1188151810Sstefanf } 1189204800Sjilles if (argc != 0) 1190214538Sjilles error("commandcmd bad call"); 1191100437Stjr 1192100437Stjr /* 1193100437Stjr * Do nothing successfully if no command was specified; 1194100437Stjr * ksh also does this. 1195100437Stjr */ 1196204800Sjilles return 0; 1197100437Stjr} 1198100437Stjr 1199100437Stjr 12001556Srgrimes/* 12011556Srgrimes * The return command. 12021556Srgrimes */ 12031556Srgrimes 120417987Speterint 120590111Simpreturncmd(int argc, char **argv) 120617987Speter{ 120720425Ssteve int ret = argc > 1 ? number(argv[1]) : oexitstatus; 12081556Srgrimes 12091556Srgrimes if (funcnest) { 12101556Srgrimes evalskip = SKIPFUNC; 12111556Srgrimes skipcount = 1; 121220425Ssteve } else { 121320425Ssteve /* skip the rest of the file */ 121420425Ssteve evalskip = SKIPFILE; 121520425Ssteve skipcount = 1; 12161556Srgrimes } 12171556Srgrimes return ret; 12181556Srgrimes} 12191556Srgrimes 12201556Srgrimes 122117987Speterint 122290111Simpfalsecmd(int argc __unused, char **argv __unused) 122317987Speter{ 122417987Speter return 1; 122517987Speter} 122617987Speter 122717987Speter 122817987Speterint 122990111Simptruecmd(int argc __unused, char **argv __unused) 123017987Speter{ 12311556Srgrimes return 0; 12321556Srgrimes} 12331556Srgrimes 12341556Srgrimes 123517987Speterint 123690111Simpexeccmd(int argc, char **argv) 123717987Speter{ 1238208630Sjilles /* 1239208630Sjilles * Because we have historically not supported any options, 1240208630Sjilles * only treat "--" specially. 1241208630Sjilles */ 1242208630Sjilles if (argc > 1 && strcmp(argv[1], "--") == 0) 1243208630Sjilles argc--, argv++; 12441556Srgrimes if (argc > 1) { 124517987Speter struct strlist *sp; 124617987Speter 12471556Srgrimes iflag = 0; /* exit on error */ 12481556Srgrimes mflag = 0; 12491556Srgrimes optschanged(); 125017987Speter for (sp = cmdenviron; sp ; sp = sp->next) 125117987Speter setvareq(sp->text, VEXPORT|VSTACK); 12521556Srgrimes shellexec(argv + 1, environment(), pathval(), 0); 12531556Srgrimes 12541556Srgrimes } 12551556Srgrimes return 0; 12561556Srgrimes} 1257153091Sstefanf 1258153091Sstefanf 1259153091Sstefanfint 1260153091Sstefanftimescmd(int argc __unused, char **argv __unused) 1261153091Sstefanf{ 1262153091Sstefanf struct rusage ru; 1263153091Sstefanf long shumins, shsmins, chumins, chsmins; 1264153091Sstefanf double shusecs, shssecs, chusecs, chssecs; 1265153091Sstefanf 1266153091Sstefanf if (getrusage(RUSAGE_SELF, &ru) < 0) 1267153091Sstefanf return 1; 1268153091Sstefanf shumins = ru.ru_utime.tv_sec / 60; 1269153091Sstefanf shusecs = ru.ru_utime.tv_sec % 60 + ru.ru_utime.tv_usec / 1000000.; 1270153091Sstefanf shsmins = ru.ru_stime.tv_sec / 60; 1271153091Sstefanf shssecs = ru.ru_stime.tv_sec % 60 + ru.ru_stime.tv_usec / 1000000.; 1272153091Sstefanf if (getrusage(RUSAGE_CHILDREN, &ru) < 0) 1273153091Sstefanf return 1; 1274153091Sstefanf chumins = ru.ru_utime.tv_sec / 60; 1275153091Sstefanf chusecs = ru.ru_utime.tv_sec % 60 + ru.ru_utime.tv_usec / 1000000.; 1276153091Sstefanf chsmins = ru.ru_stime.tv_sec / 60; 1277153091Sstefanf chssecs = ru.ru_stime.tv_sec % 60 + ru.ru_stime.tv_usec / 1000000.; 1278153091Sstefanf out1fmt("%ldm%.3fs %ldm%.3fs\n%ldm%.3fs %ldm%.3fs\n", shumins, 1279153091Sstefanf shusecs, shsmins, shssecs, chumins, chusecs, chsmins, chssecs); 1280153091Sstefanf return 0; 1281153091Sstefanf} 1282