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("$FreeBSD$"); 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 660264423Sjillesstatic int 661264423Sjillesmustexpandto(const char *argtext, const char *mask) 662264423Sjilles{ 663264423Sjilles for (;;) { 664264423Sjilles if (*argtext == CTLQUOTEMARK || *argtext == CTLQUOTEEND) { 665264423Sjilles argtext++; 666264423Sjilles continue; 667264423Sjilles } 668264423Sjilles if (*argtext == CTLESC) 669264423Sjilles argtext++; 670264423Sjilles else if (BASESYNTAX[(int)*argtext] == CCTL) 671264423Sjilles return (0); 672264423Sjilles if (*argtext != *mask) 673264423Sjilles return (0); 674264423Sjilles if (*argtext == '\0') 675264423Sjilles return (1); 676264423Sjilles argtext++; 677264423Sjilles mask++; 678264423Sjilles } 679264423Sjilles} 680264423Sjilles 681264423Sjillesstatic int 682264423Sjillesisdeclarationcmd(struct narg *arg) 683264423Sjilles{ 684264423Sjilles int have_command = 0; 685264423Sjilles 686264423Sjilles if (arg == NULL) 687264423Sjilles return (0); 688264423Sjilles while (mustexpandto(arg->text, "command")) { 689264423Sjilles have_command = 1; 690264423Sjilles arg = &arg->next->narg; 691264423Sjilles if (arg == NULL) 692264423Sjilles return (0); 693264423Sjilles /* 694264423Sjilles * To also allow "command -p" and "command --" as part of 695264423Sjilles * a declaration command, add code here. 696264423Sjilles * We do not do this, as ksh does not do it either and it 697264423Sjilles * is not required by POSIX. 698264423Sjilles */ 699264423Sjilles } 700264423Sjilles return (mustexpandto(arg->text, "export") || 701264423Sjilles mustexpandto(arg->text, "readonly") || 702264423Sjilles (mustexpandto(arg->text, "local") && 703264423Sjilles (have_command || !isfunc("local")))); 704264423Sjilles} 705264423Sjilles 706216826Sjilles/* 707216826Sjilles * Check if a builtin can safely be executed in the same process, 708216826Sjilles * even though it should be in a subshell (command substitution). 709216826Sjilles * Note that jobid, jobs, times and trap can show information not 710216826Sjilles * available in a child process; this is deliberate. 711216826Sjilles * The arguments should already have been expanded. 712216826Sjilles */ 713216826Sjillesstatic int 714216826Sjillessafe_builtin(int idx, int argc, char **argv) 715216826Sjilles{ 716216826Sjilles if (idx == BLTINCMD || idx == COMMANDCMD || idx == ECHOCMD || 717216826Sjilles idx == FALSECMD || idx == JOBIDCMD || idx == JOBSCMD || 718216826Sjilles idx == KILLCMD || idx == PRINTFCMD || idx == PWDCMD || 719216826Sjilles idx == TESTCMD || idx == TIMESCMD || idx == TRUECMD || 720216826Sjilles idx == TYPECMD) 721216826Sjilles return (1); 722216826Sjilles if (idx == EXPORTCMD || idx == TRAPCMD || idx == ULIMITCMD || 723216826Sjilles idx == UMASKCMD) 724216826Sjilles return (argc <= 1 || (argc == 2 && argv[1][0] == '-')); 725216826Sjilles if (idx == SETCMD) 726216826Sjilles return (argc <= 1 || (argc == 2 && (argv[1][0] == '-' || 727216826Sjilles argv[1][0] == '+') && argv[1][1] == 'o' && 728216826Sjilles argv[1][2] == '\0')); 729216826Sjilles return (0); 730216826Sjilles} 7311556Srgrimes 7321556Srgrimes/* 7331556Srgrimes * Execute a simple command. 734217035Sjilles * Note: This may or may not return if (flags & EV_EXIT). 7351556Srgrimes */ 7361556Srgrimes 737213811Sobrienstatic void 73890111Simpevalcommand(union node *cmd, int flags, struct backcmd *backcmd) 73917987Speter{ 7401556Srgrimes struct stackmark smark; 7411556Srgrimes union node *argp; 7421556Srgrimes struct arglist arglist; 7431556Srgrimes struct arglist varlist; 7441556Srgrimes char **argv; 7451556Srgrimes int argc; 7461556Srgrimes char **envp; 7471556Srgrimes int varflag; 7481556Srgrimes struct strlist *sp; 7491556Srgrimes int mode; 7501556Srgrimes int pip[2]; 7511556Srgrimes struct cmdentry cmdentry; 7521556Srgrimes struct job *jp; 7531556Srgrimes struct jmploc jmploc; 754194765Sjilles struct jmploc *savehandler; 755194765Sjilles char *savecmdname; 756194765Sjilles struct shparam saveparam; 757194765Sjilles struct localvar *savelocalvars; 758199647Sjilles struct parsefile *savetopfile; 7591556Srgrimes volatile int e; 7601556Srgrimes char *lastarg; 76145916Scracauer int realstatus; 76254884Scracauer int do_clearcmdentry; 763211287Sjilles const char *path = pathval(); 7641556Srgrimes 7651556Srgrimes /* First expand the arguments. */ 766149802Sstefanf TRACE(("evalcommand(%p, %d) called\n", (void *)cmd, flags)); 7671556Srgrimes setstackmark(&smark); 7681556Srgrimes arglist.lastp = &arglist.list; 7691556Srgrimes varlist.lastp = &varlist.list; 7701556Srgrimes varflag = 1; 771217035Sjilles jp = NULL; 77254884Scracauer do_clearcmdentry = 0; 77317987Speter oexitstatus = exitstatus; 77417987Speter exitstatus = 0; 7751556Srgrimes for (argp = cmd->ncmd.args ; argp ; argp = argp->narg.next) { 776222165Sjilles if (varflag && isassignment(argp->narg.text)) { 777264423Sjilles expandarg(argp, varflag == 1 ? &varlist : &arglist, 778264423Sjilles EXP_VARTILDE); 779222165Sjilles continue; 780264423Sjilles } else if (varflag == 1) 781264423Sjilles varflag = isdeclarationcmd(&argp->narg) ? 2 : 0; 7821556Srgrimes expandarg(argp, &arglist, EXP_FULL | EXP_TILDE); 7831556Srgrimes } 7841556Srgrimes *arglist.lastp = NULL; 7851556Srgrimes *varlist.lastp = NULL; 7861556Srgrimes expredir(cmd->ncmd.redirect); 7871556Srgrimes argc = 0; 7881556Srgrimes for (sp = arglist.list ; sp ; sp = sp->next) 7891556Srgrimes argc++; 790218306Sjilles /* Add one slot at the beginning for tryexec(). */ 791218306Sjilles argv = stalloc(sizeof (char *) * (argc + 2)); 792218306Sjilles argv++; 7931556Srgrimes 7941556Srgrimes for (sp = arglist.list ; sp ; sp = sp->next) { 7951556Srgrimes TRACE(("evalcommand arg: %s\n", sp->text)); 7961556Srgrimes *argv++ = sp->text; 7971556Srgrimes } 7981556Srgrimes *argv = NULL; 7991556Srgrimes lastarg = NULL; 8001556Srgrimes if (iflag && funcnest == 0 && argc > 0) 8011556Srgrimes lastarg = argv[-1]; 8021556Srgrimes argv -= argc; 8031556Srgrimes 8041556Srgrimes /* Print the command if xflag is set. */ 8051556Srgrimes if (xflag) { 806159632Sstefanf char sep = 0; 807222907Sjilles const char *p, *ps4; 808222907Sjilles ps4 = expandstr(ps4val()); 809222907Sjilles out2str(ps4 != NULL ? ps4 : ps4val()); 8101556Srgrimes for (sp = varlist.list ; sp ; sp = sp->next) { 811159632Sstefanf if (sep != 0) 812201366Sjilles out2c(' '); 813215567Sjilles p = strchr(sp->text, '='); 814215567Sjilles if (p != NULL) { 815215567Sjilles p++; 816215567Sjilles outbin(sp->text, p - sp->text, out2); 817194786Sjilles out2qstr(p); 818215567Sjilles } else 819215567Sjilles out2qstr(sp->text); 820159632Sstefanf sep = ' '; 8211556Srgrimes } 8221556Srgrimes for (sp = arglist.list ; sp ; sp = sp->next) { 823159632Sstefanf if (sep != 0) 824201366Sjilles out2c(' '); 825194786Sjilles /* Disambiguate command looking like assignment. */ 826194786Sjilles if (sp == arglist.list && 827194786Sjilles strchr(sp->text, '=') != NULL && 828194786Sjilles strchr(sp->text, '\'') == NULL) { 829194786Sjilles out2c('\''); 830194786Sjilles out2str(sp->text); 831194786Sjilles out2c('\''); 832194786Sjilles } else 833194786Sjilles out2qstr(sp->text); 834159632Sstefanf sep = ' '; 8351556Srgrimes } 836201366Sjilles out2c('\n'); 8371556Srgrimes flushout(&errout); 8381556Srgrimes } 8391556Srgrimes 8401556Srgrimes /* Now locate the command. */ 8411556Srgrimes if (argc == 0) { 842157601Sstefanf /* Variable assignment(s) without command */ 8431556Srgrimes cmdentry.cmdtype = CMDBUILTIN; 8441556Srgrimes cmdentry.u.index = BLTINCMD; 845205138Sjilles cmdentry.special = 0; 8461556Srgrimes } else { 84717987Speter static const char PATH[] = "PATH="; 848204800Sjilles int cmd_flags = 0, bltinonly = 0; 84917987Speter 85017987Speter /* 85117987Speter * Modify the command lookup path, if a PATH= assignment 85217987Speter * is present 85317987Speter */ 85417987Speter for (sp = varlist.list ; sp ; sp = sp->next) 85554884Scracauer if (strncmp(sp->text, PATH, sizeof(PATH) - 1) == 0) { 85617987Speter path = sp->text + sizeof(PATH) - 1; 857155301Sschweikh /* 85854884Scracauer * On `PATH=... command`, we need to make 85954884Scracauer * sure that the command isn't using the 86054884Scracauer * non-updated hash table of the outer PATH 861155301Sschweikh * setting and we need to make sure that 86254884Scracauer * the hash table isn't filled with items 86354884Scracauer * from the temporary setting. 86454884Scracauer * 865155301Sschweikh * It would be better to forbit using and 86654884Scracauer * updating the table while this command 86754884Scracauer * runs, by the command finding mechanism 86854884Scracauer * is heavily integrated with hash handling, 86954884Scracauer * so we just delete the hash before and after 87054884Scracauer * the command runs. Partly deleting like 87154884Scracauer * changepatch() does doesn't seem worth the 87254884Scracauer * bookinging effort, since most such runs add 873123996Smaxim * directories in front of the new PATH. 87454884Scracauer */ 875218324Sjilles clearcmdentry(); 87654884Scracauer do_clearcmdentry = 1; 87754884Scracauer } 87817987Speter 879204800Sjilles for (;;) { 880204800Sjilles if (bltinonly) { 881204800Sjilles cmdentry.u.index = find_builtin(*argv, &cmdentry.special); 882204800Sjilles if (cmdentry.u.index < 0) { 883201431Sjilles cmdentry.u.index = BLTINCMD; 884201431Sjilles argv--; 885201431Sjilles argc++; 886201431Sjilles break; 8871556Srgrimes } 888204800Sjilles } else 889204800Sjilles find_command(argv[0], &cmdentry, cmd_flags, path); 890204800Sjilles /* implement the bltin and command builtins here */ 891204800Sjilles if (cmdentry.cmdtype != CMDBUILTIN) 892204800Sjilles break; 893204800Sjilles if (cmdentry.u.index == BLTINCMD) { 894204800Sjilles if (argc == 1) 8951556Srgrimes break; 896204800Sjilles argv++; 897204800Sjilles argc--; 898204800Sjilles bltinonly = 1; 899204800Sjilles } else if (cmdentry.u.index == COMMANDCMD) { 900204800Sjilles if (argc == 1) 901204800Sjilles break; 902204800Sjilles if (!strcmp(argv[1], "-p")) { 903204800Sjilles if (argc == 2) 904204800Sjilles break; 905204800Sjilles if (argv[2][0] == '-') { 906204800Sjilles if (strcmp(argv[2], "--")) 907204800Sjilles break; 908204800Sjilles if (argc == 3) 909204800Sjilles break; 910204800Sjilles argv += 3; 911204800Sjilles argc -= 3; 912204800Sjilles } else { 913204800Sjilles argv += 2; 914204800Sjilles argc -= 2; 915204800Sjilles } 916204800Sjilles path = _PATH_STDPATH; 917218324Sjilles clearcmdentry(); 918204800Sjilles do_clearcmdentry = 1; 919204800Sjilles } else if (!strcmp(argv[1], "--")) { 920204800Sjilles if (argc == 2) 921204800Sjilles break; 922204800Sjilles argv += 2; 923204800Sjilles argc -= 2; 924204800Sjilles } else if (argv[1][0] == '-') 925204800Sjilles break; 926204800Sjilles else { 927204800Sjilles argv++; 928204800Sjilles argc--; 929204800Sjilles } 930204800Sjilles cmd_flags |= DO_NOFUNC; 931204800Sjilles bltinonly = 0; 932204800Sjilles } else 933204800Sjilles break; 9341556Srgrimes } 935204800Sjilles /* 936204800Sjilles * Special builtins lose their special properties when 937204800Sjilles * called via 'command'. 938204800Sjilles */ 939204800Sjilles if (cmd_flags & DO_NOFUNC) 940204800Sjilles cmdentry.special = 0; 9411556Srgrimes } 9421556Srgrimes 9431556Srgrimes /* Fork off a child process if necessary. */ 944223282Sjilles if (((cmdentry.cmdtype == CMDNORMAL || cmdentry.cmdtype == CMDUNKNOWN) 945194127Sjilles && ((flags & EV_EXIT) == 0 || have_traps())) 94617987Speter || ((flags & EV_BACKCMD) != 0 947216826Sjilles && (cmdentry.cmdtype != CMDBUILTIN || 948216826Sjilles !safe_builtin(cmdentry.u.index, argc, argv)))) { 9491556Srgrimes jp = makejob(cmd, 1); 950223282Sjilles mode = FORK_FG; 9511556Srgrimes if (flags & EV_BACKCMD) { 9521556Srgrimes mode = FORK_NOJOB; 9531556Srgrimes if (pipe(pip) < 0) 95453891Scracauer error("Pipe call failed: %s", strerror(errno)); 9551556Srgrimes } 956249242Sjilles if (cmdentry.cmdtype == CMDNORMAL && 957249242Sjilles cmd->ncmd.redirect == NULL && 958249242Sjilles varlist.list == NULL && 959249242Sjilles (mode == FORK_FG || mode == FORK_NOJOB) && 960249242Sjilles !disvforkset() && !iflag && !mflag) { 961249242Sjilles vforkexecshell(jp, argv, environment(), path, 962249242Sjilles cmdentry.u.index, flags & EV_BACKCMD ? pip : NULL); 963249242Sjilles goto parent; 964249242Sjilles } 9651556Srgrimes if (forkshell(jp, cmd, mode) != 0) 9661556Srgrimes goto parent; /* at end of routine */ 9671556Srgrimes if (flags & EV_BACKCMD) { 9681556Srgrimes FORCEINTON; 9691556Srgrimes close(pip[0]); 9701556Srgrimes if (pip[1] != 1) { 971124780Sdes dup2(pip[1], 1); 9721556Srgrimes close(pip[1]); 9731556Srgrimes } 974223163Sjilles flags &= ~EV_BACKCMD; 9751556Srgrimes } 9761556Srgrimes flags |= EV_EXIT; 9771556Srgrimes } 9781556Srgrimes 9791556Srgrimes /* This is the child process if a fork occurred. */ 9801556Srgrimes /* Execute the command. */ 9811556Srgrimes if (cmdentry.cmdtype == CMDFUNCTION) { 98220425Ssteve#ifdef DEBUG 9831556Srgrimes trputs("Shell function: "); trargs(argv); 98420425Ssteve#endif 9851556Srgrimes saveparam = shellparam; 9861556Srgrimes shellparam.malloc = 0; 98720425Ssteve shellparam.reset = 1; 9881556Srgrimes shellparam.nparam = argc - 1; 9891556Srgrimes shellparam.p = argv + 1; 9901556Srgrimes shellparam.optnext = NULL; 9911556Srgrimes INTOFF; 9921556Srgrimes savelocalvars = localvars; 9931556Srgrimes localvars = NULL; 994196483Sjilles reffunc(cmdentry.u.func); 995194765Sjilles savehandler = handler; 9961556Srgrimes if (setjmp(jmploc.loc)) { 997218306Sjilles freeparam(&shellparam); 998218306Sjilles shellparam = saveparam; 999220978Sjilles popredir(); 1000196483Sjilles unreffunc(cmdentry.u.func); 10011556Srgrimes poplocalvars(); 10021556Srgrimes localvars = savelocalvars; 1003201283Sjilles funcnest--; 10041556Srgrimes handler = savehandler; 10051556Srgrimes longjmp(handler->loc, 1); 10061556Srgrimes } 10071556Srgrimes handler = &jmploc; 1008201283Sjilles funcnest++; 1009204802Sjilles redirect(cmd->ncmd.redirect, REDIR_PUSH); 1010199660Sjilles INTON; 10111556Srgrimes for (sp = varlist.list ; sp ; sp = sp->next) 10121556Srgrimes mklocal(sp->text); 1013185231Sstefanf exitstatus = oexitstatus; 1014220978Sjilles evaltree(getfuncnode(cmdentry.u.func), 1015220978Sjilles flags & (EV_TESTED | EV_EXIT)); 10161556Srgrimes INTOFF; 1017196483Sjilles unreffunc(cmdentry.u.func); 10181556Srgrimes poplocalvars(); 10191556Srgrimes localvars = savelocalvars; 10201556Srgrimes freeparam(&shellparam); 10211556Srgrimes shellparam = saveparam; 10221556Srgrimes handler = savehandler; 1023201283Sjilles funcnest--; 10241556Srgrimes popredir(); 10251556Srgrimes INTON; 10261556Srgrimes if (evalskip == SKIPFUNC) { 10271556Srgrimes evalskip = 0; 10281556Srgrimes skipcount = 0; 10291556Srgrimes } 1030217035Sjilles if (jp) 10311556Srgrimes exitshell(exitstatus); 10321556Srgrimes } else if (cmdentry.cmdtype == CMDBUILTIN) { 103320425Ssteve#ifdef DEBUG 10341556Srgrimes trputs("builtin command: "); trargs(argv); 103520425Ssteve#endif 10361556Srgrimes mode = (cmdentry.u.index == EXECCMD)? 0 : REDIR_PUSH; 10371556Srgrimes if (flags == EV_BACKCMD) { 10381556Srgrimes memout.nleft = 0; 10391556Srgrimes memout.nextc = memout.buf; 10401556Srgrimes memout.bufsize = 64; 10411556Srgrimes mode |= REDIR_BACKQ; 10421556Srgrimes } 10431556Srgrimes savecmdname = commandname; 1044199647Sjilles savetopfile = getcurrentfile(); 10451556Srgrimes cmdenviron = varlist.list; 10461556Srgrimes e = -1; 1047194765Sjilles savehandler = handler; 10481556Srgrimes if (setjmp(jmploc.loc)) { 10491556Srgrimes e = exception; 1050220978Sjilles if (e == EXINT) 1051220978Sjilles exitstatus = SIGINT+128; 1052220978Sjilles else if (e != EXEXIT) 1053220978Sjilles exitstatus = 2; 10541556Srgrimes goto cmddone; 10551556Srgrimes } 10561556Srgrimes handler = &jmploc; 1057157601Sstefanf redirect(cmd->ncmd.redirect, mode); 1058205138Sjilles /* 1059205138Sjilles * If there is no command word, redirection errors should 1060205138Sjilles * not be fatal but assignment errors should. 1061205138Sjilles */ 1062230625Sjilles if (argc == 0) 1063205138Sjilles cmdentry.special = 1; 1064216870Sjilles listsetvar(cmdenviron, cmdentry.special ? 0 : VNOSET); 1065207678Sjilles if (argc > 0) 1066207678Sjilles bltinsetlocale(); 10671556Srgrimes commandname = argv[0]; 10681556Srgrimes argptr = argv + 1; 1069201053Sjilles nextopt_optptr = NULL; /* initialize nextopt */ 1070193169Sstefanf builtin_flags = flags; 10711556Srgrimes exitstatus = (*builtinfunc[cmdentry.u.index])(argc, argv); 10721556Srgrimes flushall(); 10731556Srgrimescmddone: 1074207678Sjilles if (argc > 0) 1075207678Sjilles bltinunsetlocale(); 107660592Scracauer cmdenviron = NULL; 10771556Srgrimes out1 = &output; 10781556Srgrimes out2 = &errout; 10791556Srgrimes freestdout(); 1080217035Sjilles handler = savehandler; 1081218306Sjilles commandname = savecmdname; 1082218306Sjilles if (jp) 1083218306Sjilles exitshell(exitstatus); 1084201366Sjilles if (flags == EV_BACKCMD) { 1085201366Sjilles backcmd->buf = memout.buf; 1086201366Sjilles backcmd->nleft = memout.nextc - memout.buf; 1087201366Sjilles memout.buf = NULL; 1088201366Sjilles } 1089220978Sjilles if (cmdentry.u.index != EXECCMD) 1090204801Sjilles popredir(); 10911556Srgrimes if (e != -1) { 109220425Ssteve if ((e != EXERROR && e != EXEXEC) 1093157601Sstefanf || cmdentry.special) 10941556Srgrimes exraise(e); 1095199647Sjilles popfilesupto(savetopfile); 1096201366Sjilles if (flags != EV_BACKCMD) 1097201366Sjilles FORCEINTON; 10981556Srgrimes } 10991556Srgrimes } else { 110020425Ssteve#ifdef DEBUG 11011556Srgrimes trputs("normal command: "); trargs(argv); 110220425Ssteve#endif 11031556Srgrimes redirect(cmd->ncmd.redirect, 0); 11041556Srgrimes for (sp = varlist.list ; sp ; sp = sp->next) 11051556Srgrimes setvareq(sp->text, VEXPORT|VSTACK); 11061556Srgrimes envp = environment(); 1107204800Sjilles shellexec(argv, envp, path, cmdentry.u.index); 11081556Srgrimes /*NOTREACHED*/ 11091556Srgrimes } 11101556Srgrimes goto out; 11111556Srgrimes 11121556Srgrimesparent: /* parent process gets here (if we forked) */ 1113212214Sjilles if (mode == FORK_FG) { /* argument to fork */ 11141556Srgrimes INTOFF; 111545916Scracauer exitstatus = waitforjob(jp, &realstatus); 11161556Srgrimes INTON; 111745916Scracauer if (iflag && loopnest > 0 && WIFSIGNALED(realstatus)) { 111845266Scracauer evalskip = SKIPBREAK; 111945266Scracauer skipcount = loopnest; 112045266Scracauer } 1121212214Sjilles } else if (mode == FORK_NOJOB) { 11221556Srgrimes backcmd->fd = pip[0]; 11231556Srgrimes close(pip[1]); 11241556Srgrimes backcmd->jp = jp; 1125223282Sjilles } 11261556Srgrimes 11271556Srgrimesout: 11281556Srgrimes if (lastarg) 11291556Srgrimes setvar("_", lastarg, 0); 113054884Scracauer if (do_clearcmdentry) 1131218324Sjilles clearcmdentry(); 11321556Srgrimes popstackmark(&smark); 11331556Srgrimes} 11341556Srgrimes 11351556Srgrimes 11361556Srgrimes 11371556Srgrimes/* 11381556Srgrimes * Search for a command. This is called before we fork so that the 11391556Srgrimes * location of the command will be available in the parent as well as 11401556Srgrimes * the child. The check for "goodname" is an overly conservative 11411556Srgrimes * check that the name will not be subject to expansion. 11421556Srgrimes */ 11431556Srgrimes 1144213811Sobrienstatic void 114590111Simpprehash(union node *n) 114617987Speter{ 11471556Srgrimes struct cmdentry entry; 11481556Srgrimes 1149159633Sstefanf if (n && n->type == NCMD && n->ncmd.args) 115017987Speter if (goodname(n->ncmd.args->narg.text)) 115117987Speter find_command(n->ncmd.args->narg.text, &entry, 0, 115217987Speter pathval()); 11531556Srgrimes} 11541556Srgrimes 11551556Srgrimes 11561556Srgrimes 11571556Srgrimes/* 11581556Srgrimes * Builtin commands. Builtin commands whose functions are closely 11591556Srgrimes * tied to evaluation are implemented here. 11601556Srgrimes */ 11611556Srgrimes 11621556Srgrimes/* 1163201431Sjilles * No command given, a bltin command with no arguments, or a bltin command 1164201431Sjilles * with an invalid name. 11651556Srgrimes */ 11661556Srgrimes 116717987Speterint 1168201431Sjillesbltincmd(int argc, char **argv) 116917987Speter{ 1170201431Sjilles if (argc > 1) { 1171201431Sjilles out2fmt_flush("%s: not found\n", argv[1]); 1172201431Sjilles return 127; 1173201431Sjilles } 117420425Ssteve /* 117517987Speter * Preserve exitstatus of a previous possible redirection 117620425Ssteve * as POSIX mandates 117717987Speter */ 11781556Srgrimes return exitstatus; 11791556Srgrimes} 11801556Srgrimes 11811556Srgrimes 11821556Srgrimes/* 11831556Srgrimes * Handle break and continue commands. Break, continue, and return are 11841556Srgrimes * all handled by setting the evalskip flag. The evaluation routines 11851556Srgrimes * above all check this flag, and if it is set they start skipping 11861556Srgrimes * commands rather than executing them. The variable skipcount is 11871556Srgrimes * the number of loops to break/continue, or the number of function 11881556Srgrimes * levels to return. (The latter is always 1.) It should probably 11891556Srgrimes * be an error to break out of more loops than exist, but it isn't 11901556Srgrimes * in the standard shell so we don't make it one here. 11911556Srgrimes */ 11921556Srgrimes 119317987Speterint 119490111Simpbreakcmd(int argc, char **argv) 119517987Speter{ 119620425Ssteve int n = argc > 1 ? number(argv[1]) : 1; 11971556Srgrimes 11981556Srgrimes if (n > loopnest) 11991556Srgrimes n = loopnest; 12001556Srgrimes if (n > 0) { 12011556Srgrimes evalskip = (**argv == 'c')? SKIPCONT : SKIPBREAK; 12021556Srgrimes skipcount = n; 12031556Srgrimes } 12041556Srgrimes return 0; 12051556Srgrimes} 12061556Srgrimes 1207100437Stjr/* 1208100437Stjr * The `command' command. 1209100437Stjr */ 1210100437Stjrint 1211100437Stjrcommandcmd(int argc, char **argv) 1212100437Stjr{ 1213207783Sjilles const char *path; 1214100437Stjr int ch; 1215151810Sstefanf int cmd = -1; 12161556Srgrimes 1217204800Sjilles path = bltinlookup("PATH", 1); 1218100437Stjr 1219100437Stjr optind = optreset = 1; 1220100663Stjr opterr = 0; 1221151810Sstefanf while ((ch = getopt(argc, argv, "pvV")) != -1) { 1222100437Stjr switch (ch) { 1223100437Stjr case 'p': 1224207783Sjilles path = _PATH_STDPATH; 1225100437Stjr break; 1226151810Sstefanf case 'v': 1227151810Sstefanf cmd = TYPECMD_SMALLV; 1228151810Sstefanf break; 1229151810Sstefanf case 'V': 1230151810Sstefanf cmd = TYPECMD_BIGV; 1231151810Sstefanf break; 1232100437Stjr case '?': 1233100437Stjr default: 1234100437Stjr error("unknown option: -%c", optopt); 1235100437Stjr } 1236100437Stjr } 1237100437Stjr argc -= optind; 1238100437Stjr argv += optind; 1239100437Stjr 1240151810Sstefanf if (cmd != -1) { 1241151810Sstefanf if (argc != 1) 1242151810Sstefanf error("wrong number of arguments"); 1243201343Sjilles return typecmd_impl(2, argv - 1, cmd, path); 1244151810Sstefanf } 1245204800Sjilles if (argc != 0) 1246214538Sjilles error("commandcmd bad call"); 1247100437Stjr 1248100437Stjr /* 1249100437Stjr * Do nothing successfully if no command was specified; 1250100437Stjr * ksh also does this. 1251100437Stjr */ 1252204800Sjilles return 0; 1253100437Stjr} 1254100437Stjr 1255100437Stjr 12561556Srgrimes/* 12571556Srgrimes * The return command. 12581556Srgrimes */ 12591556Srgrimes 126017987Speterint 126190111Simpreturncmd(int argc, char **argv) 126217987Speter{ 126320425Ssteve int ret = argc > 1 ? number(argv[1]) : oexitstatus; 12641556Srgrimes 12651556Srgrimes if (funcnest) { 12661556Srgrimes evalskip = SKIPFUNC; 12671556Srgrimes skipcount = 1; 126820425Ssteve } else { 126920425Ssteve /* skip the rest of the file */ 127020425Ssteve evalskip = SKIPFILE; 127120425Ssteve skipcount = 1; 12721556Srgrimes } 12731556Srgrimes return ret; 12741556Srgrimes} 12751556Srgrimes 12761556Srgrimes 127717987Speterint 127890111Simpfalsecmd(int argc __unused, char **argv __unused) 127917987Speter{ 128017987Speter return 1; 128117987Speter} 128217987Speter 128317987Speter 128417987Speterint 128590111Simptruecmd(int argc __unused, char **argv __unused) 128617987Speter{ 12871556Srgrimes return 0; 12881556Srgrimes} 12891556Srgrimes 12901556Srgrimes 129117987Speterint 129290111Simpexeccmd(int argc, char **argv) 129317987Speter{ 1294208630Sjilles /* 1295208630Sjilles * Because we have historically not supported any options, 1296208630Sjilles * only treat "--" specially. 1297208630Sjilles */ 1298208630Sjilles if (argc > 1 && strcmp(argv[1], "--") == 0) 1299208630Sjilles argc--, argv++; 13001556Srgrimes if (argc > 1) { 130117987Speter struct strlist *sp; 130217987Speter 13031556Srgrimes iflag = 0; /* exit on error */ 13041556Srgrimes mflag = 0; 13051556Srgrimes optschanged(); 130617987Speter for (sp = cmdenviron; sp ; sp = sp->next) 130717987Speter setvareq(sp->text, VEXPORT|VSTACK); 13081556Srgrimes shellexec(argv + 1, environment(), pathval(), 0); 13091556Srgrimes 13101556Srgrimes } 13111556Srgrimes return 0; 13121556Srgrimes} 1313153091Sstefanf 1314153091Sstefanf 1315153091Sstefanfint 1316153091Sstefanftimescmd(int argc __unused, char **argv __unused) 1317153091Sstefanf{ 1318153091Sstefanf struct rusage ru; 1319153091Sstefanf long shumins, shsmins, chumins, chsmins; 1320153091Sstefanf double shusecs, shssecs, chusecs, chssecs; 1321153091Sstefanf 1322153091Sstefanf if (getrusage(RUSAGE_SELF, &ru) < 0) 1323153091Sstefanf return 1; 1324153091Sstefanf shumins = ru.ru_utime.tv_sec / 60; 1325153091Sstefanf shusecs = ru.ru_utime.tv_sec % 60 + ru.ru_utime.tv_usec / 1000000.; 1326153091Sstefanf shsmins = ru.ru_stime.tv_sec / 60; 1327153091Sstefanf shssecs = ru.ru_stime.tv_sec % 60 + ru.ru_stime.tv_usec / 1000000.; 1328153091Sstefanf if (getrusage(RUSAGE_CHILDREN, &ru) < 0) 1329153091Sstefanf return 1; 1330153091Sstefanf chumins = ru.ru_utime.tv_sec / 60; 1331153091Sstefanf chusecs = ru.ru_utime.tv_sec % 60 + ru.ru_utime.tv_usec / 1000000.; 1332153091Sstefanf chsmins = ru.ru_stime.tv_sec / 60; 1333153091Sstefanf chssecs = ru.ru_stime.tv_sec % 60 + ru.ru_stime.tv_usec / 1000000.; 1334153091Sstefanf out1fmt("%ldm%.3fs %ldm%.3fs\n%ldm%.3fs %ldm%.3fs\n", shumins, 1335153091Sstefanf shusecs, shsmins, shssecs, chumins, chusecs, chsmins, chssecs); 1336153091Sstefanf return 0; 1337153091Sstefanf} 1338