eval.c revision 222907
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: head/bin/sh/eval.c 222907 2011-06-09 23:12:23Z jilles $"); 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 */ 78213760Sobrienstatic int 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 } 143193169Sstefanf evalstring(p, builtin_flags & EV_TESTED); 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)) { 3891556Srgrimes if (evalskip == 0) { 3901556Srgrimes evaltree(cp->nclist.body, flags); 3911556Srgrimes } 3921556Srgrimes goto out; 3931556Srgrimes } 3941556Srgrimes } 3951556Srgrimes } 3961556Srgrimesout: 3971556Srgrimes popstackmark(&smark); 3981556Srgrimes} 3991556Srgrimes 4001556Srgrimes 4011556Srgrimes 4021556Srgrimes/* 4031556Srgrimes * Kick off a subshell to evaluate a tree. 4041556Srgrimes */ 4051556Srgrimes 406213811Sobrienstatic void 40790111Simpevalsubshell(union node *n, int flags) 40817987Speter{ 4091556Srgrimes struct job *jp; 4101556Srgrimes int backgnd = (n->type == NBACKGND); 4111556Srgrimes 412222716Sjilles oexitstatus = exitstatus; 4131556Srgrimes expredir(n->nredir.redirect); 414194774Sjilles if ((!backgnd && flags & EV_EXIT && !have_traps()) || 415194774Sjilles forkshell(jp = makejob(n, 1), n, backgnd) == 0) { 4161556Srgrimes if (backgnd) 4171556Srgrimes flags &=~ EV_TESTED; 4181556Srgrimes redirect(n->nredir.redirect, 0); 4191556Srgrimes evaltree(n->nredir.n, flags | EV_EXIT); /* never returns */ 420201053Sjilles } else if (! backgnd) { 4211556Srgrimes INTOFF; 42245916Scracauer exitstatus = waitforjob(jp, (int *)NULL); 4231556Srgrimes INTON; 424221027Sjilles } else 425221027Sjilles exitstatus = 0; 4261556Srgrimes} 4271556Srgrimes 4281556Srgrimes 429205154Sjilles/* 430205154Sjilles * Evaluate a redirected compound command. 431205154Sjilles */ 4321556Srgrimes 433213811Sobrienstatic void 434205154Sjillesevalredir(union node *n, int flags) 435205154Sjilles{ 436205154Sjilles struct jmploc jmploc; 437205154Sjilles struct jmploc *savehandler; 438205154Sjilles volatile int in_redirect = 1; 439205154Sjilles 440222716Sjilles oexitstatus = exitstatus; 441205154Sjilles expredir(n->nredir.redirect); 442205154Sjilles savehandler = handler; 443205154Sjilles if (setjmp(jmploc.loc)) { 444205154Sjilles int e; 445205154Sjilles 446205154Sjilles handler = savehandler; 447205154Sjilles e = exception; 448220978Sjilles popredir(); 449205154Sjilles if (e == EXERROR || e == EXEXEC) { 450205154Sjilles if (in_redirect) { 451205154Sjilles exitstatus = 2; 452205154Sjilles return; 453205154Sjilles } 454205154Sjilles } 455205154Sjilles longjmp(handler->loc, 1); 456205154Sjilles } else { 457205154Sjilles INTOFF; 458205154Sjilles handler = &jmploc; 459205154Sjilles redirect(n->nredir.redirect, REDIR_PUSH); 460205154Sjilles in_redirect = 0; 461205154Sjilles INTON; 462205154Sjilles evaltree(n->nredir.n, flags); 463205154Sjilles } 464205154Sjilles INTOFF; 465205154Sjilles handler = savehandler; 466205154Sjilles popredir(); 467205154Sjilles INTON; 468205154Sjilles} 469205154Sjilles 470205154Sjilles 4711556Srgrimes/* 4721556Srgrimes * Compute the names of the files in a redirection list. 4731556Srgrimes */ 4741556Srgrimes 475213811Sobrienstatic void 47690111Simpexpredir(union node *n) 47717987Speter{ 47825222Ssteve union node *redir; 4791556Srgrimes 4801556Srgrimes for (redir = n ; redir ; redir = redir->nfile.next) { 48117987Speter struct arglist fn; 48217987Speter fn.lastp = &fn.list; 48317987Speter switch (redir->type) { 48417987Speter case NFROM: 48517987Speter case NTO: 48666612Sbrian case NFROMTO: 48717987Speter case NAPPEND: 48896922Stjr case NCLOBBER: 4891556Srgrimes expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR); 4901556Srgrimes redir->nfile.expfname = fn.list->text; 49117987Speter break; 49217987Speter case NFROMFD: 49317987Speter case NTOFD: 49417987Speter if (redir->ndup.vname) { 495181017Sstefanf expandarg(redir->ndup.vname, &fn, EXP_TILDE | EXP_REDIR); 49617987Speter fixredir(redir, fn.list->text, 1); 49717987Speter } 49817987Speter break; 4991556Srgrimes } 5001556Srgrimes } 5011556Srgrimes} 5021556Srgrimes 5031556Srgrimes 5041556Srgrimes 5051556Srgrimes/* 5061556Srgrimes * Evaluate a pipeline. All the processes in the pipeline are children 5071556Srgrimes * of the process creating the pipeline. (This differs from some versions 5081556Srgrimes * of the shell, which make the last process in a pipeline the parent 5091556Srgrimes * of all the rest.) 5101556Srgrimes */ 5111556Srgrimes 512213811Sobrienstatic void 51390111Simpevalpipe(union node *n) 51417987Speter{ 5151556Srgrimes struct job *jp; 5161556Srgrimes struct nodelist *lp; 5171556Srgrimes int pipelen; 5181556Srgrimes int prevfd; 5191556Srgrimes int pip[2]; 5201556Srgrimes 521149802Sstefanf TRACE(("evalpipe(%p) called\n", (void *)n)); 5221556Srgrimes pipelen = 0; 5231556Srgrimes for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) 5241556Srgrimes pipelen++; 5251556Srgrimes INTOFF; 5261556Srgrimes jp = makejob(n, pipelen); 5271556Srgrimes prevfd = -1; 5281556Srgrimes for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { 5291556Srgrimes prehash(lp->n); 5301556Srgrimes pip[1] = -1; 5311556Srgrimes if (lp->next) { 5321556Srgrimes if (pipe(pip) < 0) { 5331556Srgrimes close(prevfd); 53453891Scracauer error("Pipe call failed: %s", strerror(errno)); 5351556Srgrimes } 5361556Srgrimes } 5371556Srgrimes if (forkshell(jp, lp->n, n->npipe.backgnd) == 0) { 5381556Srgrimes INTON; 5391556Srgrimes if (prevfd > 0) { 540124780Sdes dup2(prevfd, 0); 5411556Srgrimes close(prevfd); 5421556Srgrimes } 5431556Srgrimes if (pip[1] >= 0) { 54453282Scracauer if (!(prevfd >= 0 && pip[0] == 0)) 54552900Scracauer close(pip[0]); 5461556Srgrimes if (pip[1] != 1) { 547124780Sdes dup2(pip[1], 1); 5481556Srgrimes close(pip[1]); 5491556Srgrimes } 5501556Srgrimes } 5511556Srgrimes evaltree(lp->n, EV_EXIT); 5521556Srgrimes } 5531556Srgrimes if (prevfd >= 0) 5541556Srgrimes close(prevfd); 5551556Srgrimes prevfd = pip[0]; 556221970Sjilles if (pip[1] != -1) 557221970Sjilles close(pip[1]); 5581556Srgrimes } 5591556Srgrimes INTON; 5601556Srgrimes if (n->npipe.backgnd == 0) { 5611556Srgrimes INTOFF; 56245916Scracauer exitstatus = waitforjob(jp, (int *)NULL); 5631556Srgrimes TRACE(("evalpipe: job done exit status %d\n", exitstatus)); 5641556Srgrimes INTON; 565221027Sjilles } else 566221027Sjilles exitstatus = 0; 5671556Srgrimes} 5681556Srgrimes 5691556Srgrimes 5701556Srgrimes 571216778Sjillesstatic int 572216778Sjillesis_valid_fast_cmdsubst(union node *n) 573216778Sjilles{ 574216778Sjilles union node *argp; 575216778Sjilles 576216778Sjilles if (n->type != NCMD) 577216778Sjilles return 0; 578216778Sjilles for (argp = n->ncmd.args ; argp ; argp = argp->narg.next) 579216778Sjilles if (expandhassideeffects(argp->narg.text)) 580216778Sjilles return 0; 581216778Sjilles return 1; 582216778Sjilles} 583216778Sjilles 5841556Srgrimes/* 5851556Srgrimes * Execute a command inside back quotes. If it's a builtin command, we 5861556Srgrimes * want to save its output in a block obtained from malloc. Otherwise 5871556Srgrimes * we fork off a subprocess and get the output of the command via a pipe. 5881556Srgrimes * Should be called with interrupts off. 5891556Srgrimes */ 5901556Srgrimes 5911556Srgrimesvoid 59290111Simpevalbackcmd(union node *n, struct backcmd *result) 59317987Speter{ 5941556Srgrimes int pip[2]; 5951556Srgrimes struct job *jp; 5961556Srgrimes struct stackmark smark; /* unnecessary */ 597216761Sjilles struct jmploc jmploc; 598216761Sjilles struct jmploc *savehandler; 5991556Srgrimes 6001556Srgrimes setstackmark(&smark); 6011556Srgrimes result->fd = -1; 6021556Srgrimes result->buf = NULL; 6031556Srgrimes result->nleft = 0; 6041556Srgrimes result->jp = NULL; 60517987Speter if (n == NULL) { 60617987Speter exitstatus = 0; 6071556Srgrimes goto out; 60817987Speter } 609216778Sjilles if (is_valid_fast_cmdsubst(n)) { 61017987Speter exitstatus = oexitstatus; 611216761Sjilles savehandler = handler; 612216761Sjilles if (setjmp(jmploc.loc)) { 613216761Sjilles if (exception == EXERROR || exception == EXEXEC) 614216761Sjilles exitstatus = 2; 615216761Sjilles else if (exception != 0) { 616216761Sjilles handler = savehandler; 617216761Sjilles longjmp(handler->loc, 1); 618216761Sjilles } 619216761Sjilles } else { 620216761Sjilles handler = &jmploc; 621216761Sjilles evalcommand(n, EV_BACKCMD, result); 622216761Sjilles } 623216761Sjilles handler = savehandler; 6241556Srgrimes } else { 62517987Speter exitstatus = 0; 6261556Srgrimes if (pipe(pip) < 0) 62753891Scracauer error("Pipe call failed: %s", strerror(errno)); 6281556Srgrimes jp = makejob(n, 1); 6291556Srgrimes if (forkshell(jp, n, FORK_NOJOB) == 0) { 6301556Srgrimes FORCEINTON; 6311556Srgrimes close(pip[0]); 6321556Srgrimes if (pip[1] != 1) { 633124780Sdes dup2(pip[1], 1); 6341556Srgrimes close(pip[1]); 6351556Srgrimes } 6361556Srgrimes evaltree(n, EV_EXIT); 6371556Srgrimes } 6381556Srgrimes close(pip[1]); 6391556Srgrimes result->fd = pip[0]; 6401556Srgrimes result->jp = jp; 6411556Srgrimes } 6421556Srgrimesout: 6431556Srgrimes popstackmark(&smark); 644109627Stjr TRACE(("evalbackcmd done: fd=%d buf=%p nleft=%d jp=%p\n", 6451556Srgrimes result->fd, result->buf, result->nleft, result->jp)); 6461556Srgrimes} 6471556Srgrimes 648216826Sjilles/* 649216826Sjilles * Check if a builtin can safely be executed in the same process, 650216826Sjilles * even though it should be in a subshell (command substitution). 651216826Sjilles * Note that jobid, jobs, times and trap can show information not 652216826Sjilles * available in a child process; this is deliberate. 653216826Sjilles * The arguments should already have been expanded. 654216826Sjilles */ 655216826Sjillesstatic int 656216826Sjillessafe_builtin(int idx, int argc, char **argv) 657216826Sjilles{ 658216826Sjilles if (idx == BLTINCMD || idx == COMMANDCMD || idx == ECHOCMD || 659216826Sjilles idx == FALSECMD || idx == JOBIDCMD || idx == JOBSCMD || 660216826Sjilles idx == KILLCMD || idx == PRINTFCMD || idx == PWDCMD || 661216826Sjilles idx == TESTCMD || idx == TIMESCMD || idx == TRUECMD || 662216826Sjilles idx == TYPECMD) 663216826Sjilles return (1); 664216826Sjilles if (idx == EXPORTCMD || idx == TRAPCMD || idx == ULIMITCMD || 665216826Sjilles idx == UMASKCMD) 666216826Sjilles return (argc <= 1 || (argc == 2 && argv[1][0] == '-')); 667216826Sjilles if (idx == SETCMD) 668216826Sjilles return (argc <= 1 || (argc == 2 && (argv[1][0] == '-' || 669216826Sjilles argv[1][0] == '+') && argv[1][1] == 'o' && 670216826Sjilles argv[1][2] == '\0')); 671216826Sjilles return (0); 672216826Sjilles} 6731556Srgrimes 6741556Srgrimes/* 6751556Srgrimes * Execute a simple command. 676217035Sjilles * Note: This may or may not return if (flags & EV_EXIT). 6771556Srgrimes */ 6781556Srgrimes 679213811Sobrienstatic void 68090111Simpevalcommand(union node *cmd, int flags, struct backcmd *backcmd) 68117987Speter{ 6821556Srgrimes struct stackmark smark; 6831556Srgrimes union node *argp; 6841556Srgrimes struct arglist arglist; 6851556Srgrimes struct arglist varlist; 6861556Srgrimes char **argv; 6871556Srgrimes int argc; 6881556Srgrimes char **envp; 6891556Srgrimes int varflag; 6901556Srgrimes struct strlist *sp; 6911556Srgrimes int mode; 6921556Srgrimes int pip[2]; 6931556Srgrimes struct cmdentry cmdentry; 6941556Srgrimes struct job *jp; 6951556Srgrimes struct jmploc jmploc; 696194765Sjilles struct jmploc *savehandler; 697194765Sjilles char *savecmdname; 698194765Sjilles struct shparam saveparam; 699194765Sjilles struct localvar *savelocalvars; 700199647Sjilles struct parsefile *savetopfile; 7011556Srgrimes volatile int e; 7021556Srgrimes char *lastarg; 70345916Scracauer int realstatus; 70454884Scracauer int do_clearcmdentry; 705211287Sjilles const char *path = pathval(); 7061556Srgrimes 7071556Srgrimes /* First expand the arguments. */ 708149802Sstefanf TRACE(("evalcommand(%p, %d) called\n", (void *)cmd, flags)); 7091556Srgrimes setstackmark(&smark); 7101556Srgrimes arglist.lastp = &arglist.list; 7111556Srgrimes varlist.lastp = &varlist.list; 7121556Srgrimes varflag = 1; 713217035Sjilles jp = NULL; 71454884Scracauer do_clearcmdentry = 0; 71517987Speter oexitstatus = exitstatus; 71617987Speter exitstatus = 0; 7171556Srgrimes for (argp = cmd->ncmd.args ; argp ; argp = argp->narg.next) { 718222165Sjilles if (varflag && isassignment(argp->narg.text)) { 719222165Sjilles expandarg(argp, &varlist, EXP_VARTILDE); 720222165Sjilles continue; 7211556Srgrimes } 7221556Srgrimes expandarg(argp, &arglist, EXP_FULL | EXP_TILDE); 7231556Srgrimes varflag = 0; 7241556Srgrimes } 7251556Srgrimes *arglist.lastp = NULL; 7261556Srgrimes *varlist.lastp = NULL; 7271556Srgrimes expredir(cmd->ncmd.redirect); 7281556Srgrimes argc = 0; 7291556Srgrimes for (sp = arglist.list ; sp ; sp = sp->next) 7301556Srgrimes argc++; 731218306Sjilles /* Add one slot at the beginning for tryexec(). */ 732218306Sjilles argv = stalloc(sizeof (char *) * (argc + 2)); 733218306Sjilles argv++; 7341556Srgrimes 7351556Srgrimes for (sp = arglist.list ; sp ; sp = sp->next) { 7361556Srgrimes TRACE(("evalcommand arg: %s\n", sp->text)); 7371556Srgrimes *argv++ = sp->text; 7381556Srgrimes } 7391556Srgrimes *argv = NULL; 7401556Srgrimes lastarg = NULL; 7411556Srgrimes if (iflag && funcnest == 0 && argc > 0) 7421556Srgrimes lastarg = argv[-1]; 7431556Srgrimes argv -= argc; 7441556Srgrimes 7451556Srgrimes /* Print the command if xflag is set. */ 7461556Srgrimes if (xflag) { 747159632Sstefanf char sep = 0; 748222907Sjilles const char *p, *ps4; 749222907Sjilles ps4 = expandstr(ps4val()); 750222907Sjilles out2str(ps4 != NULL ? ps4 : ps4val()); 7511556Srgrimes for (sp = varlist.list ; sp ; sp = sp->next) { 752159632Sstefanf if (sep != 0) 753201366Sjilles out2c(' '); 754215567Sjilles p = strchr(sp->text, '='); 755215567Sjilles if (p != NULL) { 756215567Sjilles p++; 757215567Sjilles outbin(sp->text, p - sp->text, out2); 758194786Sjilles out2qstr(p); 759215567Sjilles } else 760215567Sjilles out2qstr(sp->text); 761159632Sstefanf sep = ' '; 7621556Srgrimes } 7631556Srgrimes for (sp = arglist.list ; sp ; sp = sp->next) { 764159632Sstefanf if (sep != 0) 765201366Sjilles out2c(' '); 766194786Sjilles /* Disambiguate command looking like assignment. */ 767194786Sjilles if (sp == arglist.list && 768194786Sjilles strchr(sp->text, '=') != NULL && 769194786Sjilles strchr(sp->text, '\'') == NULL) { 770194786Sjilles out2c('\''); 771194786Sjilles out2str(sp->text); 772194786Sjilles out2c('\''); 773194786Sjilles } else 774194786Sjilles out2qstr(sp->text); 775159632Sstefanf sep = ' '; 7761556Srgrimes } 777201366Sjilles out2c('\n'); 7781556Srgrimes flushout(&errout); 7791556Srgrimes } 7801556Srgrimes 7811556Srgrimes /* Now locate the command. */ 7821556Srgrimes if (argc == 0) { 783157601Sstefanf /* Variable assignment(s) without command */ 7841556Srgrimes cmdentry.cmdtype = CMDBUILTIN; 7851556Srgrimes cmdentry.u.index = BLTINCMD; 786205138Sjilles cmdentry.special = 0; 7871556Srgrimes } else { 78817987Speter static const char PATH[] = "PATH="; 789204800Sjilles int cmd_flags = 0, bltinonly = 0; 79017987Speter 79117987Speter /* 79217987Speter * Modify the command lookup path, if a PATH= assignment 79317987Speter * is present 79417987Speter */ 79517987Speter for (sp = varlist.list ; sp ; sp = sp->next) 79654884Scracauer if (strncmp(sp->text, PATH, sizeof(PATH) - 1) == 0) { 79717987Speter path = sp->text + sizeof(PATH) - 1; 798155301Sschweikh /* 79954884Scracauer * On `PATH=... command`, we need to make 80054884Scracauer * sure that the command isn't using the 80154884Scracauer * non-updated hash table of the outer PATH 802155301Sschweikh * setting and we need to make sure that 80354884Scracauer * the hash table isn't filled with items 80454884Scracauer * from the temporary setting. 80554884Scracauer * 806155301Sschweikh * It would be better to forbit using and 80754884Scracauer * updating the table while this command 80854884Scracauer * runs, by the command finding mechanism 80954884Scracauer * is heavily integrated with hash handling, 81054884Scracauer * so we just delete the hash before and after 81154884Scracauer * the command runs. Partly deleting like 81254884Scracauer * changepatch() does doesn't seem worth the 81354884Scracauer * bookinging effort, since most such runs add 814123996Smaxim * directories in front of the new PATH. 81554884Scracauer */ 816218324Sjilles clearcmdentry(); 81754884Scracauer do_clearcmdentry = 1; 81854884Scracauer } 81917987Speter 820204800Sjilles for (;;) { 821204800Sjilles if (bltinonly) { 822204800Sjilles cmdentry.u.index = find_builtin(*argv, &cmdentry.special); 823204800Sjilles if (cmdentry.u.index < 0) { 824201431Sjilles cmdentry.u.index = BLTINCMD; 825201431Sjilles argv--; 826201431Sjilles argc++; 827201431Sjilles break; 8281556Srgrimes } 829204800Sjilles } else 830204800Sjilles find_command(argv[0], &cmdentry, cmd_flags, path); 831204800Sjilles /* implement the bltin and command builtins here */ 832204800Sjilles if (cmdentry.cmdtype != CMDBUILTIN) 833204800Sjilles break; 834204800Sjilles if (cmdentry.u.index == BLTINCMD) { 835204800Sjilles if (argc == 1) 8361556Srgrimes break; 837204800Sjilles argv++; 838204800Sjilles argc--; 839204800Sjilles bltinonly = 1; 840204800Sjilles } else if (cmdentry.u.index == COMMANDCMD) { 841204800Sjilles if (argc == 1) 842204800Sjilles break; 843204800Sjilles if (!strcmp(argv[1], "-p")) { 844204800Sjilles if (argc == 2) 845204800Sjilles break; 846204800Sjilles if (argv[2][0] == '-') { 847204800Sjilles if (strcmp(argv[2], "--")) 848204800Sjilles break; 849204800Sjilles if (argc == 3) 850204800Sjilles break; 851204800Sjilles argv += 3; 852204800Sjilles argc -= 3; 853204800Sjilles } else { 854204800Sjilles argv += 2; 855204800Sjilles argc -= 2; 856204800Sjilles } 857204800Sjilles path = _PATH_STDPATH; 858218324Sjilles clearcmdentry(); 859204800Sjilles do_clearcmdentry = 1; 860204800Sjilles } else if (!strcmp(argv[1], "--")) { 861204800Sjilles if (argc == 2) 862204800Sjilles break; 863204800Sjilles argv += 2; 864204800Sjilles argc -= 2; 865204800Sjilles } else if (argv[1][0] == '-') 866204800Sjilles break; 867204800Sjilles else { 868204800Sjilles argv++; 869204800Sjilles argc--; 870204800Sjilles } 871204800Sjilles cmd_flags |= DO_NOFUNC; 872204800Sjilles bltinonly = 0; 873204800Sjilles } else 874204800Sjilles break; 8751556Srgrimes } 876204800Sjilles /* 877204800Sjilles * Special builtins lose their special properties when 878204800Sjilles * called via 'command'. 879204800Sjilles */ 880204800Sjilles if (cmd_flags & DO_NOFUNC) 881204800Sjilles cmdentry.special = 0; 8821556Srgrimes } 8831556Srgrimes 8841556Srgrimes /* Fork off a child process if necessary. */ 8851556Srgrimes if (cmd->ncmd.backgnd 886197820Sjilles || ((cmdentry.cmdtype == CMDNORMAL || cmdentry.cmdtype == CMDUNKNOWN) 887194127Sjilles && ((flags & EV_EXIT) == 0 || have_traps())) 88817987Speter || ((flags & EV_BACKCMD) != 0 889216826Sjilles && (cmdentry.cmdtype != CMDBUILTIN || 890216826Sjilles !safe_builtin(cmdentry.u.index, argc, argv)))) { 8911556Srgrimes jp = makejob(cmd, 1); 8921556Srgrimes mode = cmd->ncmd.backgnd; 8931556Srgrimes if (flags & EV_BACKCMD) { 8941556Srgrimes mode = FORK_NOJOB; 8951556Srgrimes if (pipe(pip) < 0) 89653891Scracauer error("Pipe call failed: %s", strerror(errno)); 8971556Srgrimes } 8981556Srgrimes if (forkshell(jp, cmd, mode) != 0) 8991556Srgrimes goto parent; /* at end of routine */ 9001556Srgrimes if (flags & EV_BACKCMD) { 9011556Srgrimes FORCEINTON; 9021556Srgrimes close(pip[0]); 9031556Srgrimes if (pip[1] != 1) { 904124780Sdes dup2(pip[1], 1); 9051556Srgrimes close(pip[1]); 9061556Srgrimes } 9071556Srgrimes } 9081556Srgrimes flags |= EV_EXIT; 9091556Srgrimes } 9101556Srgrimes 9111556Srgrimes /* This is the child process if a fork occurred. */ 9121556Srgrimes /* Execute the command. */ 9131556Srgrimes if (cmdentry.cmdtype == CMDFUNCTION) { 91420425Ssteve#ifdef DEBUG 9151556Srgrimes trputs("Shell function: "); trargs(argv); 91620425Ssteve#endif 9171556Srgrimes saveparam = shellparam; 9181556Srgrimes shellparam.malloc = 0; 91920425Ssteve shellparam.reset = 1; 9201556Srgrimes shellparam.nparam = argc - 1; 9211556Srgrimes shellparam.p = argv + 1; 9221556Srgrimes shellparam.optnext = NULL; 9231556Srgrimes INTOFF; 9241556Srgrimes savelocalvars = localvars; 9251556Srgrimes localvars = NULL; 926196483Sjilles reffunc(cmdentry.u.func); 927194765Sjilles savehandler = handler; 9281556Srgrimes if (setjmp(jmploc.loc)) { 929218306Sjilles freeparam(&shellparam); 930218306Sjilles shellparam = saveparam; 931220978Sjilles popredir(); 932196483Sjilles unreffunc(cmdentry.u.func); 9331556Srgrimes poplocalvars(); 9341556Srgrimes localvars = savelocalvars; 935201283Sjilles funcnest--; 9361556Srgrimes handler = savehandler; 9371556Srgrimes longjmp(handler->loc, 1); 9381556Srgrimes } 9391556Srgrimes handler = &jmploc; 940201283Sjilles funcnest++; 941204802Sjilles redirect(cmd->ncmd.redirect, REDIR_PUSH); 942199660Sjilles INTON; 9431556Srgrimes for (sp = varlist.list ; sp ; sp = sp->next) 9441556Srgrimes mklocal(sp->text); 945185231Sstefanf exitstatus = oexitstatus; 946220978Sjilles evaltree(getfuncnode(cmdentry.u.func), 947220978Sjilles flags & (EV_TESTED | EV_EXIT)); 9481556Srgrimes INTOFF; 949196483Sjilles unreffunc(cmdentry.u.func); 9501556Srgrimes poplocalvars(); 9511556Srgrimes localvars = savelocalvars; 9521556Srgrimes freeparam(&shellparam); 9531556Srgrimes shellparam = saveparam; 9541556Srgrimes handler = savehandler; 955201283Sjilles funcnest--; 9561556Srgrimes popredir(); 9571556Srgrimes INTON; 9581556Srgrimes if (evalskip == SKIPFUNC) { 9591556Srgrimes evalskip = 0; 9601556Srgrimes skipcount = 0; 9611556Srgrimes } 962217035Sjilles if (jp) 9631556Srgrimes exitshell(exitstatus); 9641556Srgrimes } else if (cmdentry.cmdtype == CMDBUILTIN) { 96520425Ssteve#ifdef DEBUG 9661556Srgrimes trputs("builtin command: "); trargs(argv); 96720425Ssteve#endif 9681556Srgrimes mode = (cmdentry.u.index == EXECCMD)? 0 : REDIR_PUSH; 9691556Srgrimes if (flags == EV_BACKCMD) { 9701556Srgrimes memout.nleft = 0; 9711556Srgrimes memout.nextc = memout.buf; 9721556Srgrimes memout.bufsize = 64; 9731556Srgrimes mode |= REDIR_BACKQ; 974201366Sjilles cmdentry.special = 0; 9751556Srgrimes } 9761556Srgrimes savecmdname = commandname; 977199647Sjilles savetopfile = getcurrentfile(); 9781556Srgrimes cmdenviron = varlist.list; 9791556Srgrimes e = -1; 980194765Sjilles savehandler = handler; 9811556Srgrimes if (setjmp(jmploc.loc)) { 9821556Srgrimes e = exception; 983220978Sjilles if (e == EXINT) 984220978Sjilles exitstatus = SIGINT+128; 985220978Sjilles else if (e != EXEXIT) 986220978Sjilles exitstatus = 2; 9871556Srgrimes goto cmddone; 9881556Srgrimes } 9891556Srgrimes handler = &jmploc; 990157601Sstefanf redirect(cmd->ncmd.redirect, mode); 991205138Sjilles /* 992205138Sjilles * If there is no command word, redirection errors should 993205138Sjilles * not be fatal but assignment errors should. 994205138Sjilles */ 995205138Sjilles if (argc == 0 && !(flags & EV_BACKCMD)) 996205138Sjilles cmdentry.special = 1; 997216870Sjilles listsetvar(cmdenviron, cmdentry.special ? 0 : VNOSET); 998207678Sjilles if (argc > 0) 999207678Sjilles bltinsetlocale(); 10001556Srgrimes commandname = argv[0]; 10011556Srgrimes argptr = argv + 1; 1002201053Sjilles nextopt_optptr = NULL; /* initialize nextopt */ 1003193169Sstefanf builtin_flags = flags; 10041556Srgrimes exitstatus = (*builtinfunc[cmdentry.u.index])(argc, argv); 10051556Srgrimes flushall(); 10061556Srgrimescmddone: 1007207678Sjilles if (argc > 0) 1008207678Sjilles bltinunsetlocale(); 100960592Scracauer cmdenviron = NULL; 10101556Srgrimes out1 = &output; 10111556Srgrimes out2 = &errout; 10121556Srgrimes freestdout(); 1013217035Sjilles handler = savehandler; 1014218306Sjilles commandname = savecmdname; 1015218306Sjilles if (jp) 1016218306Sjilles exitshell(exitstatus); 1017201366Sjilles if (flags == EV_BACKCMD) { 1018201366Sjilles backcmd->buf = memout.buf; 1019201366Sjilles backcmd->nleft = memout.nextc - memout.buf; 1020201366Sjilles memout.buf = NULL; 1021201366Sjilles } 1022220978Sjilles if (cmdentry.u.index != EXECCMD) 1023204801Sjilles popredir(); 10241556Srgrimes if (e != -1) { 102520425Ssteve if ((e != EXERROR && e != EXEXEC) 1026157601Sstefanf || cmdentry.special) 10271556Srgrimes exraise(e); 1028199647Sjilles popfilesupto(savetopfile); 1029201366Sjilles if (flags != EV_BACKCMD) 1030201366Sjilles FORCEINTON; 10311556Srgrimes } 10321556Srgrimes } else { 103320425Ssteve#ifdef DEBUG 10341556Srgrimes trputs("normal command: "); trargs(argv); 103520425Ssteve#endif 10361556Srgrimes redirect(cmd->ncmd.redirect, 0); 10371556Srgrimes for (sp = varlist.list ; sp ; sp = sp->next) 10381556Srgrimes setvareq(sp->text, VEXPORT|VSTACK); 10391556Srgrimes envp = environment(); 1040204800Sjilles shellexec(argv, envp, path, cmdentry.u.index); 10411556Srgrimes /*NOTREACHED*/ 10421556Srgrimes } 10431556Srgrimes goto out; 10441556Srgrimes 10451556Srgrimesparent: /* parent process gets here (if we forked) */ 1046212214Sjilles if (mode == FORK_FG) { /* argument to fork */ 10471556Srgrimes INTOFF; 104845916Scracauer exitstatus = waitforjob(jp, &realstatus); 10491556Srgrimes INTON; 105045916Scracauer if (iflag && loopnest > 0 && WIFSIGNALED(realstatus)) { 105145266Scracauer evalskip = SKIPBREAK; 105245266Scracauer skipcount = loopnest; 105345266Scracauer } 1054212214Sjilles } else if (mode == FORK_NOJOB) { 10551556Srgrimes backcmd->fd = pip[0]; 10561556Srgrimes close(pip[1]); 10571556Srgrimes backcmd->jp = jp; 1058221027Sjilles } else 1059221027Sjilles exitstatus = 0; 10601556Srgrimes 10611556Srgrimesout: 10621556Srgrimes if (lastarg) 10631556Srgrimes setvar("_", lastarg, 0); 106454884Scracauer if (do_clearcmdentry) 1065218324Sjilles clearcmdentry(); 10661556Srgrimes popstackmark(&smark); 10671556Srgrimes} 10681556Srgrimes 10691556Srgrimes 10701556Srgrimes 10711556Srgrimes/* 10721556Srgrimes * Search for a command. This is called before we fork so that the 10731556Srgrimes * location of the command will be available in the parent as well as 10741556Srgrimes * the child. The check for "goodname" is an overly conservative 10751556Srgrimes * check that the name will not be subject to expansion. 10761556Srgrimes */ 10771556Srgrimes 1078213811Sobrienstatic void 107990111Simpprehash(union node *n) 108017987Speter{ 10811556Srgrimes struct cmdentry entry; 10821556Srgrimes 1083159633Sstefanf if (n && n->type == NCMD && n->ncmd.args) 108417987Speter if (goodname(n->ncmd.args->narg.text)) 108517987Speter find_command(n->ncmd.args->narg.text, &entry, 0, 108617987Speter pathval()); 10871556Srgrimes} 10881556Srgrimes 10891556Srgrimes 10901556Srgrimes 10911556Srgrimes/* 10921556Srgrimes * Builtin commands. Builtin commands whose functions are closely 10931556Srgrimes * tied to evaluation are implemented here. 10941556Srgrimes */ 10951556Srgrimes 10961556Srgrimes/* 1097201431Sjilles * No command given, a bltin command with no arguments, or a bltin command 1098201431Sjilles * with an invalid name. 10991556Srgrimes */ 11001556Srgrimes 110117987Speterint 1102201431Sjillesbltincmd(int argc, char **argv) 110317987Speter{ 1104201431Sjilles if (argc > 1) { 1105201431Sjilles out2fmt_flush("%s: not found\n", argv[1]); 1106201431Sjilles return 127; 1107201431Sjilles } 110820425Ssteve /* 110917987Speter * Preserve exitstatus of a previous possible redirection 111020425Ssteve * as POSIX mandates 111117987Speter */ 11121556Srgrimes return exitstatus; 11131556Srgrimes} 11141556Srgrimes 11151556Srgrimes 11161556Srgrimes/* 11171556Srgrimes * Handle break and continue commands. Break, continue, and return are 11181556Srgrimes * all handled by setting the evalskip flag. The evaluation routines 11191556Srgrimes * above all check this flag, and if it is set they start skipping 11201556Srgrimes * commands rather than executing them. The variable skipcount is 11211556Srgrimes * the number of loops to break/continue, or the number of function 11221556Srgrimes * levels to return. (The latter is always 1.) It should probably 11231556Srgrimes * be an error to break out of more loops than exist, but it isn't 11241556Srgrimes * in the standard shell so we don't make it one here. 11251556Srgrimes */ 11261556Srgrimes 112717987Speterint 112890111Simpbreakcmd(int argc, char **argv) 112917987Speter{ 113020425Ssteve int n = argc > 1 ? number(argv[1]) : 1; 11311556Srgrimes 11321556Srgrimes if (n > loopnest) 11331556Srgrimes n = loopnest; 11341556Srgrimes if (n > 0) { 11351556Srgrimes evalskip = (**argv == 'c')? SKIPCONT : SKIPBREAK; 11361556Srgrimes skipcount = n; 11371556Srgrimes } 11381556Srgrimes return 0; 11391556Srgrimes} 11401556Srgrimes 1141100437Stjr/* 1142100437Stjr * The `command' command. 1143100437Stjr */ 1144100437Stjrint 1145100437Stjrcommandcmd(int argc, char **argv) 1146100437Stjr{ 1147207783Sjilles const char *path; 1148100437Stjr int ch; 1149151810Sstefanf int cmd = -1; 11501556Srgrimes 1151204800Sjilles path = bltinlookup("PATH", 1); 1152100437Stjr 1153100437Stjr optind = optreset = 1; 1154100663Stjr opterr = 0; 1155151810Sstefanf while ((ch = getopt(argc, argv, "pvV")) != -1) { 1156100437Stjr switch (ch) { 1157100437Stjr case 'p': 1158207783Sjilles path = _PATH_STDPATH; 1159100437Stjr break; 1160151810Sstefanf case 'v': 1161151810Sstefanf cmd = TYPECMD_SMALLV; 1162151810Sstefanf break; 1163151810Sstefanf case 'V': 1164151810Sstefanf cmd = TYPECMD_BIGV; 1165151810Sstefanf break; 1166100437Stjr case '?': 1167100437Stjr default: 1168100437Stjr error("unknown option: -%c", optopt); 1169100437Stjr } 1170100437Stjr } 1171100437Stjr argc -= optind; 1172100437Stjr argv += optind; 1173100437Stjr 1174151810Sstefanf if (cmd != -1) { 1175151810Sstefanf if (argc != 1) 1176151810Sstefanf error("wrong number of arguments"); 1177201343Sjilles return typecmd_impl(2, argv - 1, cmd, path); 1178151810Sstefanf } 1179204800Sjilles if (argc != 0) 1180214538Sjilles error("commandcmd bad call"); 1181100437Stjr 1182100437Stjr /* 1183100437Stjr * Do nothing successfully if no command was specified; 1184100437Stjr * ksh also does this. 1185100437Stjr */ 1186204800Sjilles return 0; 1187100437Stjr} 1188100437Stjr 1189100437Stjr 11901556Srgrimes/* 11911556Srgrimes * The return command. 11921556Srgrimes */ 11931556Srgrimes 119417987Speterint 119590111Simpreturncmd(int argc, char **argv) 119617987Speter{ 119720425Ssteve int ret = argc > 1 ? number(argv[1]) : oexitstatus; 11981556Srgrimes 11991556Srgrimes if (funcnest) { 12001556Srgrimes evalskip = SKIPFUNC; 12011556Srgrimes skipcount = 1; 120220425Ssteve } else { 120320425Ssteve /* skip the rest of the file */ 120420425Ssteve evalskip = SKIPFILE; 120520425Ssteve skipcount = 1; 12061556Srgrimes } 12071556Srgrimes return ret; 12081556Srgrimes} 12091556Srgrimes 12101556Srgrimes 121117987Speterint 121290111Simpfalsecmd(int argc __unused, char **argv __unused) 121317987Speter{ 121417987Speter return 1; 121517987Speter} 121617987Speter 121717987Speter 121817987Speterint 121990111Simptruecmd(int argc __unused, char **argv __unused) 122017987Speter{ 12211556Srgrimes return 0; 12221556Srgrimes} 12231556Srgrimes 12241556Srgrimes 122517987Speterint 122690111Simpexeccmd(int argc, char **argv) 122717987Speter{ 1228208630Sjilles /* 1229208630Sjilles * Because we have historically not supported any options, 1230208630Sjilles * only treat "--" specially. 1231208630Sjilles */ 1232208630Sjilles if (argc > 1 && strcmp(argv[1], "--") == 0) 1233208630Sjilles argc--, argv++; 12341556Srgrimes if (argc > 1) { 123517987Speter struct strlist *sp; 123617987Speter 12371556Srgrimes iflag = 0; /* exit on error */ 12381556Srgrimes mflag = 0; 12391556Srgrimes optschanged(); 124017987Speter for (sp = cmdenviron; sp ; sp = sp->next) 124117987Speter setvareq(sp->text, VEXPORT|VSTACK); 12421556Srgrimes shellexec(argv + 1, environment(), pathval(), 0); 12431556Srgrimes 12441556Srgrimes } 12451556Srgrimes return 0; 12461556Srgrimes} 1247153091Sstefanf 1248153091Sstefanf 1249153091Sstefanfint 1250153091Sstefanftimescmd(int argc __unused, char **argv __unused) 1251153091Sstefanf{ 1252153091Sstefanf struct rusage ru; 1253153091Sstefanf long shumins, shsmins, chumins, chsmins; 1254153091Sstefanf double shusecs, shssecs, chusecs, chssecs; 1255153091Sstefanf 1256153091Sstefanf if (getrusage(RUSAGE_SELF, &ru) < 0) 1257153091Sstefanf return 1; 1258153091Sstefanf shumins = ru.ru_utime.tv_sec / 60; 1259153091Sstefanf shusecs = ru.ru_utime.tv_sec % 60 + ru.ru_utime.tv_usec / 1000000.; 1260153091Sstefanf shsmins = ru.ru_stime.tv_sec / 60; 1261153091Sstefanf shssecs = ru.ru_stime.tv_sec % 60 + ru.ru_stime.tv_usec / 1000000.; 1262153091Sstefanf if (getrusage(RUSAGE_CHILDREN, &ru) < 0) 1263153091Sstefanf return 1; 1264153091Sstefanf chumins = ru.ru_utime.tv_sec / 60; 1265153091Sstefanf chusecs = ru.ru_utime.tv_sec % 60 + ru.ru_utime.tv_usec / 1000000.; 1266153091Sstefanf chsmins = ru.ru_stime.tv_sec / 60; 1267153091Sstefanf chssecs = ru.ru_stime.tv_sec % 60 + ru.ru_stime.tv_usec / 1000000.; 1268153091Sstefanf out1fmt("%ldm%.3fs %ldm%.3fs\n%ldm%.3fs %ldm%.3fs\n", shumins, 1269153091Sstefanf shusecs, shsmins, shssecs, chumins, chusecs, chsmins, chssecs); 1270153091Sstefanf return 0; 1271153091Sstefanf} 1272