eval.c revision 212214
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 212214 2010-09-04 21:23:46Z 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 */ 781556SrgrimesSTATIC int skipcount; /* number of levels to skip */ 791556SrgrimesMKINIT int loopnest; /* current loop nesting level */ 801556Srgrimesint funcnest; /* depth of function calls */ 81193169SstefanfSTATIC 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 90149933SstefanfSTATIC void evalloop(union node *, int); 91149933SstefanfSTATIC void evalfor(union node *, int); 9290111SimpSTATIC void evalcase(union node *, int); 9390111SimpSTATIC void evalsubshell(union node *, int); 94205154SjillesSTATIC void evalredir(union node *, int); 9590111SimpSTATIC void expredir(union node *); 9690111SimpSTATIC void evalpipe(union node *); 9790111SimpSTATIC void evalcommand(union node *, int, struct backcmd *); 9890111SimpSTATIC void prehash(union node *); 991556Srgrimes 1001556Srgrimes 1011556Srgrimes/* 1021556Srgrimes * Called to reset things after an exception. 1031556Srgrimes */ 1041556Srgrimes 1051556Srgrimes#ifdef mkinit 1061556SrgrimesINCLUDE "eval.h" 1071556Srgrimes 1081556SrgrimesRESET { 1091556Srgrimes evalskip = 0; 1101556Srgrimes loopnest = 0; 1111556Srgrimes funcnest = 0; 1121556Srgrimes} 1131556Srgrimes 1141556SrgrimesSHELLPROC { 1151556Srgrimes exitstatus = 0; 1161556Srgrimes} 1171556Srgrimes#endif 1181556Srgrimes 1191556Srgrimes 1201556Srgrimes 1211556Srgrimes/* 12246684Skris * The eval command. 1231556Srgrimes */ 1241556Srgrimes 12517987Speterint 12690111Simpevalcmd(int argc, char **argv) 1271556Srgrimes{ 1281556Srgrimes char *p; 1291556Srgrimes char *concat; 1301556Srgrimes char **ap; 1311556Srgrimes 1321556Srgrimes if (argc > 1) { 1331556Srgrimes p = argv[1]; 1341556Srgrimes if (argc > 2) { 1351556Srgrimes STARTSTACKSTR(concat); 1361556Srgrimes ap = argv + 2; 1371556Srgrimes for (;;) { 1381556Srgrimes while (*p) 1391556Srgrimes STPUTC(*p++, concat); 1401556Srgrimes if ((p = *ap++) == NULL) 1411556Srgrimes break; 1421556Srgrimes STPUTC(' ', concat); 1431556Srgrimes } 1441556Srgrimes STPUTC('\0', concat); 1451556Srgrimes p = grabstackstr(concat); 1461556Srgrimes } 147193169Sstefanf evalstring(p, builtin_flags & EV_TESTED); 148210829Sjilles } else 149210829Sjilles exitstatus = 0; 1501556Srgrimes return exitstatus; 1511556Srgrimes} 1521556Srgrimes 1531556Srgrimes 1541556Srgrimes/* 1551556Srgrimes * Execute a command or commands contained in a string. 1561556Srgrimes */ 1571556Srgrimes 1581556Srgrimesvoid 159193169Sstefanfevalstring(char *s, int flags) 16090111Simp{ 1611556Srgrimes union node *n; 1621556Srgrimes struct stackmark smark; 163194128Sjilles int flags_exit; 164210829Sjilles int any; 1651556Srgrimes 166194128Sjilles flags_exit = flags & EV_EXIT; 167194128Sjilles flags &= ~EV_EXIT; 168210829Sjilles any = 0; 1691556Srgrimes setstackmark(&smark); 1701556Srgrimes setinputstring(s, 1); 1711556Srgrimes while ((n = parsecmd(0)) != NEOF) { 172194128Sjilles if (n != NULL) { 173194128Sjilles if (flags_exit && preadateof()) 174194128Sjilles evaltree(n, flags | EV_EXIT); 175194128Sjilles else 176194128Sjilles evaltree(n, flags); 177210829Sjilles any = 1; 178194128Sjilles } 1791556Srgrimes popstackmark(&smark); 1801556Srgrimes } 1811556Srgrimes popfile(); 1821556Srgrimes popstackmark(&smark); 183210829Sjilles if (!any) 184210829Sjilles exitstatus = 0; 185194128Sjilles if (flags_exit) 186194128Sjilles exitshell(exitstatus); 1871556Srgrimes} 1881556Srgrimes 1891556Srgrimes 1901556Srgrimes/* 1911556Srgrimes * Evaluate a parse tree. The value is left in the global variable 1921556Srgrimes * exitstatus. 1931556Srgrimes */ 1941556Srgrimes 1951556Srgrimesvoid 19690111Simpevaltree(union node *n, int flags) 19717987Speter{ 198149927Sstefanf int do_etest; 199149927Sstefanf 200149927Sstefanf do_etest = 0; 2011556Srgrimes if (n == NULL) { 2021556Srgrimes TRACE(("evaltree(NULL) called\n")); 2031556Srgrimes exitstatus = 0; 2041556Srgrimes goto out; 2051556Srgrimes } 20617987Speter#ifndef NO_HISTORY 2071556Srgrimes displayhist = 1; /* show history substitutions done with fc */ 20817987Speter#endif 209149802Sstefanf TRACE(("evaltree(%p: %d) called\n", (void *)n, n->type)); 2101556Srgrimes switch (n->type) { 2111556Srgrimes case NSEMI: 212149932Sstefanf evaltree(n->nbinary.ch1, flags & ~EV_EXIT); 2131556Srgrimes if (evalskip) 2141556Srgrimes goto out; 2151556Srgrimes evaltree(n->nbinary.ch2, flags); 2161556Srgrimes break; 2171556Srgrimes case NAND: 2181556Srgrimes evaltree(n->nbinary.ch1, EV_TESTED); 21918754Ssteve if (evalskip || exitstatus != 0) { 2201556Srgrimes goto out; 22118754Ssteve } 2221556Srgrimes evaltree(n->nbinary.ch2, flags); 2231556Srgrimes break; 2241556Srgrimes case NOR: 2251556Srgrimes evaltree(n->nbinary.ch1, EV_TESTED); 2261556Srgrimes if (evalskip || exitstatus == 0) 2271556Srgrimes goto out; 2281556Srgrimes evaltree(n->nbinary.ch2, flags); 2291556Srgrimes break; 2301556Srgrimes case NREDIR: 231205154Sjilles evalredir(n, flags); 2321556Srgrimes break; 2331556Srgrimes case NSUBSHELL: 2341556Srgrimes evalsubshell(n, flags); 235149927Sstefanf do_etest = !(flags & EV_TESTED); 2361556Srgrimes break; 2371556Srgrimes case NBACKGND: 2381556Srgrimes evalsubshell(n, flags); 2391556Srgrimes break; 2401556Srgrimes case NIF: { 2411556Srgrimes evaltree(n->nif.test, EV_TESTED); 2421556Srgrimes if (evalskip) 2431556Srgrimes goto out; 24420425Ssteve if (exitstatus == 0) 2451556Srgrimes evaltree(n->nif.ifpart, flags); 24617987Speter else if (n->nif.elsepart) 2471556Srgrimes evaltree(n->nif.elsepart, flags); 24820425Ssteve else 24920425Ssteve exitstatus = 0; 2501556Srgrimes break; 2511556Srgrimes } 2521556Srgrimes case NWHILE: 2531556Srgrimes case NUNTIL: 254149933Sstefanf evalloop(n, flags & ~EV_EXIT); 2551556Srgrimes break; 2561556Srgrimes case NFOR: 257149933Sstefanf evalfor(n, flags & ~EV_EXIT); 2581556Srgrimes break; 2591556Srgrimes case NCASE: 2601556Srgrimes evalcase(n, flags); 2611556Srgrimes break; 2621556Srgrimes case NDEFUN: 2631556Srgrimes defun(n->narg.text, n->narg.next); 2641556Srgrimes exitstatus = 0; 2651556Srgrimes break; 2661556Srgrimes case NNOT: 2671556Srgrimes evaltree(n->nnot.com, EV_TESTED); 2681556Srgrimes exitstatus = !exitstatus; 2691556Srgrimes break; 2701556Srgrimes 2711556Srgrimes case NPIPE: 2721556Srgrimes evalpipe(n); 273149927Sstefanf do_etest = !(flags & EV_TESTED); 2741556Srgrimes break; 2751556Srgrimes case NCMD: 2761556Srgrimes evalcommand(n, flags, (struct backcmd *)NULL); 277149927Sstefanf do_etest = !(flags & EV_TESTED); 2781556Srgrimes break; 2791556Srgrimes default: 2801556Srgrimes out1fmt("Node type = %d\n", n->type); 2811556Srgrimes flushout(&output); 2821556Srgrimes break; 2831556Srgrimes } 2841556Srgrimesout: 2851556Srgrimes if (pendingsigs) 2861556Srgrimes dotrap(); 287149927Sstefanf if ((flags & EV_EXIT) || (eflag && exitstatus != 0 && do_etest)) 2881556Srgrimes exitshell(exitstatus); 2891556Srgrimes} 2901556Srgrimes 2911556Srgrimes 2921556SrgrimesSTATIC void 293149933Sstefanfevalloop(union node *n, int flags) 29417987Speter{ 2951556Srgrimes int status; 2961556Srgrimes 2971556Srgrimes loopnest++; 2981556Srgrimes status = 0; 2991556Srgrimes for (;;) { 3001556Srgrimes evaltree(n->nbinary.ch1, EV_TESTED); 3011556Srgrimes if (evalskip) { 3021556Srgrimesskipping: if (evalskip == SKIPCONT && --skipcount <= 0) { 3031556Srgrimes evalskip = 0; 3041556Srgrimes continue; 3051556Srgrimes } 3061556Srgrimes if (evalskip == SKIPBREAK && --skipcount <= 0) 3071556Srgrimes evalskip = 0; 3081556Srgrimes break; 3091556Srgrimes } 3101556Srgrimes if (n->type == NWHILE) { 3111556Srgrimes if (exitstatus != 0) 3121556Srgrimes break; 3131556Srgrimes } else { 3141556Srgrimes if (exitstatus == 0) 3151556Srgrimes break; 3161556Srgrimes } 317149933Sstefanf evaltree(n->nbinary.ch2, flags); 3181556Srgrimes status = exitstatus; 3191556Srgrimes if (evalskip) 3201556Srgrimes goto skipping; 3211556Srgrimes } 3221556Srgrimes loopnest--; 3231556Srgrimes exitstatus = status; 3241556Srgrimes} 3251556Srgrimes 3261556Srgrimes 3271556Srgrimes 3281556SrgrimesSTATIC void 329149933Sstefanfevalfor(union node *n, int flags) 33017987Speter{ 3311556Srgrimes struct arglist arglist; 3321556Srgrimes union node *argp; 3331556Srgrimes struct strlist *sp; 3341556Srgrimes struct stackmark smark; 3351556Srgrimes 3361556Srgrimes setstackmark(&smark); 3371556Srgrimes arglist.lastp = &arglist.list; 3381556Srgrimes for (argp = n->nfor.args ; argp ; argp = argp->narg.next) { 33917987Speter oexitstatus = exitstatus; 3401556Srgrimes expandarg(argp, &arglist, EXP_FULL | EXP_TILDE); 3411556Srgrimes if (evalskip) 3421556Srgrimes goto out; 3431556Srgrimes } 3441556Srgrimes *arglist.lastp = NULL; 3451556Srgrimes 3461556Srgrimes exitstatus = 0; 3471556Srgrimes loopnest++; 3481556Srgrimes for (sp = arglist.list ; sp ; sp = sp->next) { 3491556Srgrimes setvar(n->nfor.var, sp->text, 0); 350149933Sstefanf evaltree(n->nfor.body, flags); 3511556Srgrimes if (evalskip) { 3521556Srgrimes if (evalskip == SKIPCONT && --skipcount <= 0) { 3531556Srgrimes evalskip = 0; 3541556Srgrimes continue; 3551556Srgrimes } 3561556Srgrimes if (evalskip == SKIPBREAK && --skipcount <= 0) 3571556Srgrimes evalskip = 0; 3581556Srgrimes break; 3591556Srgrimes } 3601556Srgrimes } 3611556Srgrimes loopnest--; 3621556Srgrimesout: 3631556Srgrimes popstackmark(&smark); 3641556Srgrimes} 3651556Srgrimes 3661556Srgrimes 3671556Srgrimes 3681556SrgrimesSTATIC void 36990111Simpevalcase(union node *n, int flags) 37017987Speter{ 3711556Srgrimes union node *cp; 3721556Srgrimes union node *patp; 3731556Srgrimes struct arglist arglist; 3741556Srgrimes struct stackmark smark; 3751556Srgrimes 3761556Srgrimes setstackmark(&smark); 3771556Srgrimes arglist.lastp = &arglist.list; 37817987Speter oexitstatus = exitstatus; 379172440Sstefanf exitstatus = 0; 3801556Srgrimes expandarg(n->ncase.expr, &arglist, EXP_TILDE); 3811556Srgrimes for (cp = n->ncase.cases ; cp && evalskip == 0 ; cp = cp->nclist.next) { 3821556Srgrimes for (patp = cp->nclist.pattern ; patp ; patp = patp->narg.next) { 3831556Srgrimes if (casematch(patp, arglist.list->text)) { 3841556Srgrimes if (evalskip == 0) { 3851556Srgrimes evaltree(cp->nclist.body, flags); 3861556Srgrimes } 3871556Srgrimes goto out; 3881556Srgrimes } 3891556Srgrimes } 3901556Srgrimes } 3911556Srgrimesout: 3921556Srgrimes popstackmark(&smark); 3931556Srgrimes} 3941556Srgrimes 3951556Srgrimes 3961556Srgrimes 3971556Srgrimes/* 3981556Srgrimes * Kick off a subshell to evaluate a tree. 3991556Srgrimes */ 4001556Srgrimes 4011556SrgrimesSTATIC void 40290111Simpevalsubshell(union node *n, int flags) 40317987Speter{ 4041556Srgrimes struct job *jp; 4051556Srgrimes int backgnd = (n->type == NBACKGND); 4061556Srgrimes 4071556Srgrimes expredir(n->nredir.redirect); 408194774Sjilles if ((!backgnd && flags & EV_EXIT && !have_traps()) || 409194774Sjilles forkshell(jp = makejob(n, 1), n, backgnd) == 0) { 4101556Srgrimes if (backgnd) 4111556Srgrimes flags &=~ EV_TESTED; 4121556Srgrimes redirect(n->nredir.redirect, 0); 4131556Srgrimes evaltree(n->nredir.n, flags | EV_EXIT); /* never returns */ 414201053Sjilles } else if (! backgnd) { 4151556Srgrimes INTOFF; 41645916Scracauer exitstatus = waitforjob(jp, (int *)NULL); 4171556Srgrimes INTON; 4181556Srgrimes } 4191556Srgrimes} 4201556Srgrimes 4211556Srgrimes 422205154Sjilles/* 423205154Sjilles * Evaluate a redirected compound command. 424205154Sjilles */ 4251556Srgrimes 426205154SjillesSTATIC void 427205154Sjillesevalredir(union node *n, int flags) 428205154Sjilles{ 429205154Sjilles struct jmploc jmploc; 430205154Sjilles struct jmploc *savehandler; 431205154Sjilles volatile int in_redirect = 1; 432205154Sjilles 433205154Sjilles expredir(n->nredir.redirect); 434205154Sjilles savehandler = handler; 435205154Sjilles if (setjmp(jmploc.loc)) { 436205154Sjilles int e; 437205154Sjilles 438205154Sjilles handler = savehandler; 439205154Sjilles e = exception; 440205154Sjilles if (e == EXERROR || e == EXEXEC) { 441205154Sjilles popredir(); 442205154Sjilles if (in_redirect) { 443205154Sjilles exitstatus = 2; 444205154Sjilles return; 445205154Sjilles } 446205154Sjilles } 447205154Sjilles longjmp(handler->loc, 1); 448205154Sjilles } else { 449205154Sjilles INTOFF; 450205154Sjilles handler = &jmploc; 451205154Sjilles redirect(n->nredir.redirect, REDIR_PUSH); 452205154Sjilles in_redirect = 0; 453205154Sjilles INTON; 454205154Sjilles evaltree(n->nredir.n, flags); 455205154Sjilles } 456205154Sjilles INTOFF; 457205154Sjilles handler = savehandler; 458205154Sjilles popredir(); 459205154Sjilles INTON; 460205154Sjilles} 461205154Sjilles 462205154Sjilles 4631556Srgrimes/* 4641556Srgrimes * Compute the names of the files in a redirection list. 4651556Srgrimes */ 4661556Srgrimes 4671556SrgrimesSTATIC void 46890111Simpexpredir(union node *n) 46917987Speter{ 47025222Ssteve union node *redir; 4711556Srgrimes 4721556Srgrimes for (redir = n ; redir ; redir = redir->nfile.next) { 47317987Speter struct arglist fn; 47417987Speter fn.lastp = &fn.list; 47517987Speter oexitstatus = exitstatus; 47617987Speter switch (redir->type) { 47717987Speter case NFROM: 47817987Speter case NTO: 47966612Sbrian case NFROMTO: 48017987Speter case NAPPEND: 48196922Stjr case NCLOBBER: 4821556Srgrimes expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR); 4831556Srgrimes redir->nfile.expfname = fn.list->text; 48417987Speter break; 48517987Speter case NFROMFD: 48617987Speter case NTOFD: 48717987Speter if (redir->ndup.vname) { 488181017Sstefanf expandarg(redir->ndup.vname, &fn, EXP_TILDE | EXP_REDIR); 48917987Speter fixredir(redir, fn.list->text, 1); 49017987Speter } 49117987Speter break; 4921556Srgrimes } 4931556Srgrimes } 4941556Srgrimes} 4951556Srgrimes 4961556Srgrimes 4971556Srgrimes 4981556Srgrimes/* 4991556Srgrimes * Evaluate a pipeline. All the processes in the pipeline are children 5001556Srgrimes * of the process creating the pipeline. (This differs from some versions 5011556Srgrimes * of the shell, which make the last process in a pipeline the parent 5021556Srgrimes * of all the rest.) 5031556Srgrimes */ 5041556Srgrimes 5051556SrgrimesSTATIC void 50690111Simpevalpipe(union node *n) 50717987Speter{ 5081556Srgrimes struct job *jp; 5091556Srgrimes struct nodelist *lp; 5101556Srgrimes int pipelen; 5111556Srgrimes int prevfd; 5121556Srgrimes int pip[2]; 5131556Srgrimes 514149802Sstefanf TRACE(("evalpipe(%p) called\n", (void *)n)); 5151556Srgrimes pipelen = 0; 5161556Srgrimes for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) 5171556Srgrimes pipelen++; 5181556Srgrimes INTOFF; 5191556Srgrimes jp = makejob(n, pipelen); 5201556Srgrimes prevfd = -1; 5211556Srgrimes for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { 5221556Srgrimes prehash(lp->n); 5231556Srgrimes pip[1] = -1; 5241556Srgrimes if (lp->next) { 5251556Srgrimes if (pipe(pip) < 0) { 5261556Srgrimes close(prevfd); 52753891Scracauer error("Pipe call failed: %s", strerror(errno)); 5281556Srgrimes } 5291556Srgrimes } 5301556Srgrimes if (forkshell(jp, lp->n, n->npipe.backgnd) == 0) { 5311556Srgrimes INTON; 5321556Srgrimes if (prevfd > 0) { 533124780Sdes dup2(prevfd, 0); 5341556Srgrimes close(prevfd); 5351556Srgrimes } 5361556Srgrimes if (pip[1] >= 0) { 53753282Scracauer if (!(prevfd >= 0 && pip[0] == 0)) 53852900Scracauer close(pip[0]); 5391556Srgrimes if (pip[1] != 1) { 540124780Sdes dup2(pip[1], 1); 5411556Srgrimes close(pip[1]); 5421556Srgrimes } 5431556Srgrimes } 5441556Srgrimes evaltree(lp->n, EV_EXIT); 5451556Srgrimes } 5461556Srgrimes if (prevfd >= 0) 5471556Srgrimes close(prevfd); 5481556Srgrimes prevfd = pip[0]; 5491556Srgrimes close(pip[1]); 5501556Srgrimes } 5511556Srgrimes INTON; 5521556Srgrimes if (n->npipe.backgnd == 0) { 5531556Srgrimes INTOFF; 55445916Scracauer exitstatus = waitforjob(jp, (int *)NULL); 5551556Srgrimes TRACE(("evalpipe: job done exit status %d\n", exitstatus)); 5561556Srgrimes INTON; 5571556Srgrimes } 5581556Srgrimes} 5591556Srgrimes 5601556Srgrimes 5611556Srgrimes 5621556Srgrimes/* 5631556Srgrimes * Execute a command inside back quotes. If it's a builtin command, we 5641556Srgrimes * want to save its output in a block obtained from malloc. Otherwise 5651556Srgrimes * we fork off a subprocess and get the output of the command via a pipe. 5661556Srgrimes * Should be called with interrupts off. 5671556Srgrimes */ 5681556Srgrimes 5691556Srgrimesvoid 57090111Simpevalbackcmd(union node *n, struct backcmd *result) 57117987Speter{ 5721556Srgrimes int pip[2]; 5731556Srgrimes struct job *jp; 5741556Srgrimes struct stackmark smark; /* unnecessary */ 5751556Srgrimes 5761556Srgrimes setstackmark(&smark); 5771556Srgrimes result->fd = -1; 5781556Srgrimes result->buf = NULL; 5791556Srgrimes result->nleft = 0; 5801556Srgrimes result->jp = NULL; 58117987Speter if (n == NULL) { 58217987Speter exitstatus = 0; 5831556Srgrimes goto out; 58417987Speter } 5851556Srgrimes if (n->type == NCMD) { 58617987Speter exitstatus = oexitstatus; 5871556Srgrimes evalcommand(n, EV_BACKCMD, result); 5881556Srgrimes } else { 58917987Speter exitstatus = 0; 5901556Srgrimes if (pipe(pip) < 0) 59153891Scracauer error("Pipe call failed: %s", strerror(errno)); 5921556Srgrimes jp = makejob(n, 1); 5931556Srgrimes if (forkshell(jp, n, FORK_NOJOB) == 0) { 5941556Srgrimes FORCEINTON; 5951556Srgrimes close(pip[0]); 5961556Srgrimes if (pip[1] != 1) { 597124780Sdes dup2(pip[1], 1); 5981556Srgrimes close(pip[1]); 5991556Srgrimes } 6001556Srgrimes evaltree(n, EV_EXIT); 6011556Srgrimes } 6021556Srgrimes close(pip[1]); 6031556Srgrimes result->fd = pip[0]; 6041556Srgrimes result->jp = jp; 6051556Srgrimes } 6061556Srgrimesout: 6071556Srgrimes popstackmark(&smark); 608109627Stjr TRACE(("evalbackcmd done: fd=%d buf=%p nleft=%d jp=%p\n", 6091556Srgrimes result->fd, result->buf, result->nleft, result->jp)); 6101556Srgrimes} 6111556Srgrimes 6121556Srgrimes 6131556Srgrimes 6141556Srgrimes/* 6151556Srgrimes * Execute a simple command. 6161556Srgrimes */ 6171556Srgrimes 6181556SrgrimesSTATIC void 61990111Simpevalcommand(union node *cmd, int flags, struct backcmd *backcmd) 62017987Speter{ 6211556Srgrimes struct stackmark smark; 6221556Srgrimes union node *argp; 6231556Srgrimes struct arglist arglist; 6241556Srgrimes struct arglist varlist; 6251556Srgrimes char **argv; 6261556Srgrimes int argc; 6271556Srgrimes char **envp; 6281556Srgrimes int varflag; 6291556Srgrimes struct strlist *sp; 6301556Srgrimes int mode; 6311556Srgrimes int pip[2]; 6321556Srgrimes struct cmdentry cmdentry; 6331556Srgrimes struct job *jp; 6341556Srgrimes struct jmploc jmploc; 635194765Sjilles struct jmploc *savehandler; 636194765Sjilles char *savecmdname; 637194765Sjilles struct shparam saveparam; 638194765Sjilles struct localvar *savelocalvars; 639199647Sjilles struct parsefile *savetopfile; 6401556Srgrimes volatile int e; 6411556Srgrimes char *lastarg; 64245916Scracauer int realstatus; 64354884Scracauer int do_clearcmdentry; 644211287Sjilles const char *path = pathval(); 6451556Srgrimes 6461556Srgrimes /* First expand the arguments. */ 647149802Sstefanf TRACE(("evalcommand(%p, %d) called\n", (void *)cmd, flags)); 6481556Srgrimes setstackmark(&smark); 6491556Srgrimes arglist.lastp = &arglist.list; 6501556Srgrimes varlist.lastp = &varlist.list; 6511556Srgrimes varflag = 1; 65254884Scracauer do_clearcmdentry = 0; 65317987Speter oexitstatus = exitstatus; 65417987Speter exitstatus = 0; 6551556Srgrimes for (argp = cmd->ncmd.args ; argp ; argp = argp->narg.next) { 65617987Speter char *p = argp->narg.text; 6571556Srgrimes if (varflag && is_name(*p)) { 6581556Srgrimes do { 6591556Srgrimes p++; 6601556Srgrimes } while (is_in_name(*p)); 6611556Srgrimes if (*p == '=') { 6621556Srgrimes expandarg(argp, &varlist, EXP_VARTILDE); 6631556Srgrimes continue; 6641556Srgrimes } 6651556Srgrimes } 6661556Srgrimes expandarg(argp, &arglist, EXP_FULL | EXP_TILDE); 6671556Srgrimes varflag = 0; 6681556Srgrimes } 6691556Srgrimes *arglist.lastp = NULL; 6701556Srgrimes *varlist.lastp = NULL; 6711556Srgrimes expredir(cmd->ncmd.redirect); 6721556Srgrimes argc = 0; 6731556Srgrimes for (sp = arglist.list ; sp ; sp = sp->next) 6741556Srgrimes argc++; 6751556Srgrimes argv = stalloc(sizeof (char *) * (argc + 1)); 6761556Srgrimes 6771556Srgrimes for (sp = arglist.list ; sp ; sp = sp->next) { 6781556Srgrimes TRACE(("evalcommand arg: %s\n", sp->text)); 6791556Srgrimes *argv++ = sp->text; 6801556Srgrimes } 6811556Srgrimes *argv = NULL; 6821556Srgrimes lastarg = NULL; 6831556Srgrimes if (iflag && funcnest == 0 && argc > 0) 6841556Srgrimes lastarg = argv[-1]; 6851556Srgrimes argv -= argc; 6861556Srgrimes 6871556Srgrimes /* Print the command if xflag is set. */ 6881556Srgrimes if (xflag) { 689159632Sstefanf char sep = 0; 690194786Sjilles const char *p; 691159632Sstefanf out2str(ps4val()); 6921556Srgrimes for (sp = varlist.list ; sp ; sp = sp->next) { 693159632Sstefanf if (sep != 0) 694201366Sjilles out2c(' '); 695194786Sjilles p = sp->text; 696194786Sjilles while (*p != '=' && *p != '\0') 697194786Sjilles out2c(*p++); 698194786Sjilles if (*p != '\0') { 699194786Sjilles out2c(*p++); 700194786Sjilles out2qstr(p); 701194786Sjilles } 702159632Sstefanf sep = ' '; 7031556Srgrimes } 7041556Srgrimes for (sp = arglist.list ; sp ; sp = sp->next) { 705159632Sstefanf if (sep != 0) 706201366Sjilles out2c(' '); 707194786Sjilles /* Disambiguate command looking like assignment. */ 708194786Sjilles if (sp == arglist.list && 709194786Sjilles strchr(sp->text, '=') != NULL && 710194786Sjilles strchr(sp->text, '\'') == NULL) { 711194786Sjilles out2c('\''); 712194786Sjilles out2str(sp->text); 713194786Sjilles out2c('\''); 714194786Sjilles } else 715194786Sjilles out2qstr(sp->text); 716159632Sstefanf sep = ' '; 7171556Srgrimes } 718201366Sjilles out2c('\n'); 7191556Srgrimes flushout(&errout); 7201556Srgrimes } 7211556Srgrimes 7221556Srgrimes /* Now locate the command. */ 7231556Srgrimes if (argc == 0) { 724157601Sstefanf /* Variable assignment(s) without command */ 7251556Srgrimes cmdentry.cmdtype = CMDBUILTIN; 7261556Srgrimes cmdentry.u.index = BLTINCMD; 727205138Sjilles cmdentry.special = 0; 7281556Srgrimes } else { 72917987Speter static const char PATH[] = "PATH="; 730204800Sjilles int cmd_flags = 0, bltinonly = 0; 73117987Speter 73217987Speter /* 73317987Speter * Modify the command lookup path, if a PATH= assignment 73417987Speter * is present 73517987Speter */ 73617987Speter for (sp = varlist.list ; sp ; sp = sp->next) 73754884Scracauer if (strncmp(sp->text, PATH, sizeof(PATH) - 1) == 0) { 73817987Speter path = sp->text + sizeof(PATH) - 1; 739155301Sschweikh /* 74054884Scracauer * On `PATH=... command`, we need to make 74154884Scracauer * sure that the command isn't using the 74254884Scracauer * non-updated hash table of the outer PATH 743155301Sschweikh * setting and we need to make sure that 74454884Scracauer * the hash table isn't filled with items 74554884Scracauer * from the temporary setting. 74654884Scracauer * 747155301Sschweikh * It would be better to forbit using and 74854884Scracauer * updating the table while this command 74954884Scracauer * runs, by the command finding mechanism 75054884Scracauer * is heavily integrated with hash handling, 75154884Scracauer * so we just delete the hash before and after 75254884Scracauer * the command runs. Partly deleting like 75354884Scracauer * changepatch() does doesn't seem worth the 75454884Scracauer * bookinging effort, since most such runs add 755123996Smaxim * directories in front of the new PATH. 75654884Scracauer */ 75754884Scracauer clearcmdentry(0); 75854884Scracauer do_clearcmdentry = 1; 75954884Scracauer } 76017987Speter 761204800Sjilles for (;;) { 762204800Sjilles if (bltinonly) { 763204800Sjilles cmdentry.u.index = find_builtin(*argv, &cmdentry.special); 764204800Sjilles if (cmdentry.u.index < 0) { 765201431Sjilles cmdentry.u.index = BLTINCMD; 766201431Sjilles argv--; 767201431Sjilles argc++; 768201431Sjilles break; 7691556Srgrimes } 770204800Sjilles } else 771204800Sjilles find_command(argv[0], &cmdentry, cmd_flags, path); 772204800Sjilles /* implement the bltin and command builtins here */ 773204800Sjilles if (cmdentry.cmdtype != CMDBUILTIN) 774204800Sjilles break; 775204800Sjilles if (cmdentry.u.index == BLTINCMD) { 776204800Sjilles if (argc == 1) 7771556Srgrimes break; 778204800Sjilles argv++; 779204800Sjilles argc--; 780204800Sjilles bltinonly = 1; 781204800Sjilles } else if (cmdentry.u.index == COMMANDCMD) { 782204800Sjilles if (argc == 1) 783204800Sjilles break; 784204800Sjilles if (!strcmp(argv[1], "-p")) { 785204800Sjilles if (argc == 2) 786204800Sjilles break; 787204800Sjilles if (argv[2][0] == '-') { 788204800Sjilles if (strcmp(argv[2], "--")) 789204800Sjilles break; 790204800Sjilles if (argc == 3) 791204800Sjilles break; 792204800Sjilles argv += 3; 793204800Sjilles argc -= 3; 794204800Sjilles } else { 795204800Sjilles argv += 2; 796204800Sjilles argc -= 2; 797204800Sjilles } 798204800Sjilles path = _PATH_STDPATH; 799204800Sjilles clearcmdentry(0); 800204800Sjilles do_clearcmdentry = 1; 801204800Sjilles } else if (!strcmp(argv[1], "--")) { 802204800Sjilles if (argc == 2) 803204800Sjilles break; 804204800Sjilles argv += 2; 805204800Sjilles argc -= 2; 806204800Sjilles } else if (argv[1][0] == '-') 807204800Sjilles break; 808204800Sjilles else { 809204800Sjilles argv++; 810204800Sjilles argc--; 811204800Sjilles } 812204800Sjilles cmd_flags |= DO_NOFUNC; 813204800Sjilles bltinonly = 0; 814204800Sjilles } else 815204800Sjilles break; 8161556Srgrimes } 817204800Sjilles /* 818204800Sjilles * Special builtins lose their special properties when 819204800Sjilles * called via 'command'. 820204800Sjilles */ 821204800Sjilles if (cmd_flags & DO_NOFUNC) 822204800Sjilles cmdentry.special = 0; 8231556Srgrimes } 8241556Srgrimes 8251556Srgrimes /* Fork off a child process if necessary. */ 8261556Srgrimes if (cmd->ncmd.backgnd 827197820Sjilles || ((cmdentry.cmdtype == CMDNORMAL || cmdentry.cmdtype == CMDUNKNOWN) 828194127Sjilles && ((flags & EV_EXIT) == 0 || have_traps())) 82917987Speter || ((flags & EV_BACKCMD) != 0 8301556Srgrimes && (cmdentry.cmdtype != CMDBUILTIN 83148896Ssheldonh || cmdentry.u.index == CDCMD 8321556Srgrimes || cmdentry.u.index == DOTCMD 833204800Sjilles || cmdentry.u.index == EVALCMD))) { 8341556Srgrimes jp = makejob(cmd, 1); 8351556Srgrimes mode = cmd->ncmd.backgnd; 8361556Srgrimes if (flags & EV_BACKCMD) { 8371556Srgrimes mode = FORK_NOJOB; 8381556Srgrimes if (pipe(pip) < 0) 83953891Scracauer error("Pipe call failed: %s", strerror(errno)); 8401556Srgrimes } 8411556Srgrimes if (forkshell(jp, cmd, mode) != 0) 8421556Srgrimes goto parent; /* at end of routine */ 8431556Srgrimes if (flags & EV_BACKCMD) { 8441556Srgrimes FORCEINTON; 8451556Srgrimes close(pip[0]); 8461556Srgrimes if (pip[1] != 1) { 847124780Sdes dup2(pip[1], 1); 8481556Srgrimes close(pip[1]); 8491556Srgrimes } 8501556Srgrimes } 8511556Srgrimes flags |= EV_EXIT; 8521556Srgrimes } 8531556Srgrimes 8541556Srgrimes /* This is the child process if a fork occurred. */ 8551556Srgrimes /* Execute the command. */ 8561556Srgrimes if (cmdentry.cmdtype == CMDFUNCTION) { 85720425Ssteve#ifdef DEBUG 8581556Srgrimes trputs("Shell function: "); trargs(argv); 85920425Ssteve#endif 8601556Srgrimes saveparam = shellparam; 8611556Srgrimes shellparam.malloc = 0; 86220425Ssteve shellparam.reset = 1; 8631556Srgrimes shellparam.nparam = argc - 1; 8641556Srgrimes shellparam.p = argv + 1; 8651556Srgrimes shellparam.optnext = NULL; 8661556Srgrimes INTOFF; 8671556Srgrimes savelocalvars = localvars; 8681556Srgrimes localvars = NULL; 869196483Sjilles reffunc(cmdentry.u.func); 870194765Sjilles savehandler = handler; 8711556Srgrimes if (setjmp(jmploc.loc)) { 8721556Srgrimes if (exception == EXSHELLPROC) 873194765Sjilles freeparam(&saveparam); 8741556Srgrimes else { 8751556Srgrimes freeparam(&shellparam); 8761556Srgrimes shellparam = saveparam; 877204802Sjilles if (exception == EXERROR || exception == EXEXEC) 878204802Sjilles popredir(); 8791556Srgrimes } 880196483Sjilles unreffunc(cmdentry.u.func); 8811556Srgrimes poplocalvars(); 8821556Srgrimes localvars = savelocalvars; 883201283Sjilles funcnest--; 8841556Srgrimes handler = savehandler; 8851556Srgrimes longjmp(handler->loc, 1); 8861556Srgrimes } 8871556Srgrimes handler = &jmploc; 888201283Sjilles funcnest++; 889204802Sjilles redirect(cmd->ncmd.redirect, REDIR_PUSH); 890199660Sjilles INTON; 8911556Srgrimes for (sp = varlist.list ; sp ; sp = sp->next) 8921556Srgrimes mklocal(sp->text); 893185231Sstefanf exitstatus = oexitstatus; 89435675Scracauer if (flags & EV_TESTED) 895196634Sjilles evaltree(getfuncnode(cmdentry.u.func), EV_TESTED); 89635675Scracauer else 897196634Sjilles evaltree(getfuncnode(cmdentry.u.func), 0); 8981556Srgrimes INTOFF; 899196483Sjilles unreffunc(cmdentry.u.func); 9001556Srgrimes poplocalvars(); 9011556Srgrimes localvars = savelocalvars; 9021556Srgrimes freeparam(&shellparam); 9031556Srgrimes shellparam = saveparam; 9041556Srgrimes handler = savehandler; 905201283Sjilles funcnest--; 9061556Srgrimes popredir(); 9071556Srgrimes INTON; 9081556Srgrimes if (evalskip == SKIPFUNC) { 9091556Srgrimes evalskip = 0; 9101556Srgrimes skipcount = 0; 9111556Srgrimes } 9121556Srgrimes if (flags & EV_EXIT) 9131556Srgrimes exitshell(exitstatus); 9141556Srgrimes } else if (cmdentry.cmdtype == CMDBUILTIN) { 91520425Ssteve#ifdef DEBUG 9161556Srgrimes trputs("builtin command: "); trargs(argv); 91720425Ssteve#endif 9181556Srgrimes mode = (cmdentry.u.index == EXECCMD)? 0 : REDIR_PUSH; 9191556Srgrimes if (flags == EV_BACKCMD) { 9201556Srgrimes memout.nleft = 0; 9211556Srgrimes memout.nextc = memout.buf; 9221556Srgrimes memout.bufsize = 64; 9231556Srgrimes mode |= REDIR_BACKQ; 924201366Sjilles cmdentry.special = 0; 9251556Srgrimes } 9261556Srgrimes savecmdname = commandname; 927199647Sjilles savetopfile = getcurrentfile(); 9281556Srgrimes cmdenviron = varlist.list; 9291556Srgrimes e = -1; 930194765Sjilles savehandler = handler; 9311556Srgrimes if (setjmp(jmploc.loc)) { 9321556Srgrimes e = exception; 9331556Srgrimes exitstatus = (e == EXINT)? SIGINT+128 : 2; 9341556Srgrimes goto cmddone; 9351556Srgrimes } 9361556Srgrimes handler = &jmploc; 937157601Sstefanf redirect(cmd->ncmd.redirect, mode); 938205138Sjilles /* 939205138Sjilles * If there is no command word, redirection errors should 940205138Sjilles * not be fatal but assignment errors should. 941205138Sjilles */ 942205138Sjilles if (argc == 0 && !(flags & EV_BACKCMD)) 943205138Sjilles cmdentry.special = 1; 944157601Sstefanf if (cmdentry.special) 945157601Sstefanf listsetvar(cmdenviron); 946207678Sjilles if (argc > 0) 947207678Sjilles bltinsetlocale(); 9481556Srgrimes commandname = argv[0]; 9491556Srgrimes argptr = argv + 1; 950201053Sjilles nextopt_optptr = NULL; /* initialize nextopt */ 951193169Sstefanf builtin_flags = flags; 9521556Srgrimes exitstatus = (*builtinfunc[cmdentry.u.index])(argc, argv); 9531556Srgrimes flushall(); 9541556Srgrimescmddone: 955207678Sjilles if (argc > 0) 956207678Sjilles bltinunsetlocale(); 95760592Scracauer cmdenviron = NULL; 9581556Srgrimes out1 = &output; 9591556Srgrimes out2 = &errout; 9601556Srgrimes freestdout(); 9611556Srgrimes if (e != EXSHELLPROC) { 9621556Srgrimes commandname = savecmdname; 9631556Srgrimes if (flags & EV_EXIT) { 9641556Srgrimes exitshell(exitstatus); 9651556Srgrimes } 9661556Srgrimes } 9671556Srgrimes handler = savehandler; 968201366Sjilles if (flags == EV_BACKCMD) { 969201366Sjilles backcmd->buf = memout.buf; 970201366Sjilles backcmd->nleft = memout.nextc - memout.buf; 971201366Sjilles memout.buf = NULL; 972201366Sjilles } 973204801Sjilles if (cmdentry.u.index != EXECCMD && 974204801Sjilles (e == -1 || e == EXERROR || e == EXEXEC)) 975204801Sjilles popredir(); 9761556Srgrimes if (e != -1) { 97720425Ssteve if ((e != EXERROR && e != EXEXEC) 978157601Sstefanf || cmdentry.special) 9791556Srgrimes exraise(e); 980199647Sjilles popfilesupto(savetopfile); 981201366Sjilles if (flags != EV_BACKCMD) 982201366Sjilles FORCEINTON; 9831556Srgrimes } 9841556Srgrimes } else { 98520425Ssteve#ifdef DEBUG 9861556Srgrimes trputs("normal command: "); trargs(argv); 98720425Ssteve#endif 9881556Srgrimes redirect(cmd->ncmd.redirect, 0); 9891556Srgrimes for (sp = varlist.list ; sp ; sp = sp->next) 9901556Srgrimes setvareq(sp->text, VEXPORT|VSTACK); 9911556Srgrimes envp = environment(); 992204800Sjilles shellexec(argv, envp, path, cmdentry.u.index); 9931556Srgrimes /*NOTREACHED*/ 9941556Srgrimes } 9951556Srgrimes goto out; 9961556Srgrimes 9971556Srgrimesparent: /* parent process gets here (if we forked) */ 998212214Sjilles if (mode == FORK_FG) { /* argument to fork */ 9991556Srgrimes INTOFF; 100045916Scracauer exitstatus = waitforjob(jp, &realstatus); 10011556Srgrimes INTON; 100245916Scracauer if (iflag && loopnest > 0 && WIFSIGNALED(realstatus)) { 100345266Scracauer evalskip = SKIPBREAK; 100445266Scracauer skipcount = loopnest; 100545266Scracauer } 1006212214Sjilles } else if (mode == FORK_NOJOB) { 10071556Srgrimes backcmd->fd = pip[0]; 10081556Srgrimes close(pip[1]); 10091556Srgrimes backcmd->jp = jp; 10101556Srgrimes } 10111556Srgrimes 10121556Srgrimesout: 10131556Srgrimes if (lastarg) 10141556Srgrimes setvar("_", lastarg, 0); 101554884Scracauer if (do_clearcmdentry) 101654884Scracauer clearcmdentry(0); 10171556Srgrimes popstackmark(&smark); 10181556Srgrimes} 10191556Srgrimes 10201556Srgrimes 10211556Srgrimes 10221556Srgrimes/* 10231556Srgrimes * Search for a command. This is called before we fork so that the 10241556Srgrimes * location of the command will be available in the parent as well as 10251556Srgrimes * the child. The check for "goodname" is an overly conservative 10261556Srgrimes * check that the name will not be subject to expansion. 10271556Srgrimes */ 10281556Srgrimes 10291556SrgrimesSTATIC void 103090111Simpprehash(union node *n) 103117987Speter{ 10321556Srgrimes struct cmdentry entry; 10331556Srgrimes 1034159633Sstefanf if (n && n->type == NCMD && n->ncmd.args) 103517987Speter if (goodname(n->ncmd.args->narg.text)) 103617987Speter find_command(n->ncmd.args->narg.text, &entry, 0, 103717987Speter pathval()); 10381556Srgrimes} 10391556Srgrimes 10401556Srgrimes 10411556Srgrimes 10421556Srgrimes/* 10431556Srgrimes * Builtin commands. Builtin commands whose functions are closely 10441556Srgrimes * tied to evaluation are implemented here. 10451556Srgrimes */ 10461556Srgrimes 10471556Srgrimes/* 1048201431Sjilles * No command given, a bltin command with no arguments, or a bltin command 1049201431Sjilles * with an invalid name. 10501556Srgrimes */ 10511556Srgrimes 105217987Speterint 1053201431Sjillesbltincmd(int argc, char **argv) 105417987Speter{ 1055201431Sjilles if (argc > 1) { 1056201431Sjilles out2fmt_flush("%s: not found\n", argv[1]); 1057201431Sjilles return 127; 1058201431Sjilles } 105920425Ssteve /* 106017987Speter * Preserve exitstatus of a previous possible redirection 106120425Ssteve * as POSIX mandates 106217987Speter */ 10631556Srgrimes return exitstatus; 10641556Srgrimes} 10651556Srgrimes 10661556Srgrimes 10671556Srgrimes/* 10681556Srgrimes * Handle break and continue commands. Break, continue, and return are 10691556Srgrimes * all handled by setting the evalskip flag. The evaluation routines 10701556Srgrimes * above all check this flag, and if it is set they start skipping 10711556Srgrimes * commands rather than executing them. The variable skipcount is 10721556Srgrimes * the number of loops to break/continue, or the number of function 10731556Srgrimes * levels to return. (The latter is always 1.) It should probably 10741556Srgrimes * be an error to break out of more loops than exist, but it isn't 10751556Srgrimes * in the standard shell so we don't make it one here. 10761556Srgrimes */ 10771556Srgrimes 107817987Speterint 107990111Simpbreakcmd(int argc, char **argv) 108017987Speter{ 108120425Ssteve int n = argc > 1 ? number(argv[1]) : 1; 10821556Srgrimes 10831556Srgrimes if (n > loopnest) 10841556Srgrimes n = loopnest; 10851556Srgrimes if (n > 0) { 10861556Srgrimes evalskip = (**argv == 'c')? SKIPCONT : SKIPBREAK; 10871556Srgrimes skipcount = n; 10881556Srgrimes } 10891556Srgrimes return 0; 10901556Srgrimes} 10911556Srgrimes 1092100437Stjr/* 1093100437Stjr * The `command' command. 1094100437Stjr */ 1095100437Stjrint 1096100437Stjrcommandcmd(int argc, char **argv) 1097100437Stjr{ 1098207783Sjilles const char *path; 1099100437Stjr int ch; 1100151810Sstefanf int cmd = -1; 11011556Srgrimes 1102204800Sjilles path = bltinlookup("PATH", 1); 1103100437Stjr 1104100437Stjr optind = optreset = 1; 1105100663Stjr opterr = 0; 1106151810Sstefanf while ((ch = getopt(argc, argv, "pvV")) != -1) { 1107100437Stjr switch (ch) { 1108100437Stjr case 'p': 1109207783Sjilles path = _PATH_STDPATH; 1110100437Stjr break; 1111151810Sstefanf case 'v': 1112151810Sstefanf cmd = TYPECMD_SMALLV; 1113151810Sstefanf break; 1114151810Sstefanf case 'V': 1115151810Sstefanf cmd = TYPECMD_BIGV; 1116151810Sstefanf break; 1117100437Stjr case '?': 1118100437Stjr default: 1119100437Stjr error("unknown option: -%c", optopt); 1120100437Stjr } 1121100437Stjr } 1122100437Stjr argc -= optind; 1123100437Stjr argv += optind; 1124100437Stjr 1125151810Sstefanf if (cmd != -1) { 1126151810Sstefanf if (argc != 1) 1127151810Sstefanf error("wrong number of arguments"); 1128201343Sjilles return typecmd_impl(2, argv - 1, cmd, path); 1129151810Sstefanf } 1130204800Sjilles if (argc != 0) 1131204800Sjilles error("commandcmd() called while it should not be"); 1132100437Stjr 1133100437Stjr /* 1134100437Stjr * Do nothing successfully if no command was specified; 1135100437Stjr * ksh also does this. 1136100437Stjr */ 1137204800Sjilles return 0; 1138100437Stjr} 1139100437Stjr 1140100437Stjr 11411556Srgrimes/* 11421556Srgrimes * The return command. 11431556Srgrimes */ 11441556Srgrimes 114517987Speterint 114690111Simpreturncmd(int argc, char **argv) 114717987Speter{ 114820425Ssteve int ret = argc > 1 ? number(argv[1]) : oexitstatus; 11491556Srgrimes 11501556Srgrimes if (funcnest) { 11511556Srgrimes evalskip = SKIPFUNC; 11521556Srgrimes skipcount = 1; 115320425Ssteve } else { 115420425Ssteve /* skip the rest of the file */ 115520425Ssteve evalskip = SKIPFILE; 115620425Ssteve skipcount = 1; 11571556Srgrimes } 11581556Srgrimes return ret; 11591556Srgrimes} 11601556Srgrimes 11611556Srgrimes 116217987Speterint 116390111Simpfalsecmd(int argc __unused, char **argv __unused) 116417987Speter{ 116517987Speter return 1; 116617987Speter} 116717987Speter 116817987Speter 116917987Speterint 117090111Simptruecmd(int argc __unused, char **argv __unused) 117117987Speter{ 11721556Srgrimes return 0; 11731556Srgrimes} 11741556Srgrimes 11751556Srgrimes 117617987Speterint 117790111Simpexeccmd(int argc, char **argv) 117817987Speter{ 1179208630Sjilles /* 1180208630Sjilles * Because we have historically not supported any options, 1181208630Sjilles * only treat "--" specially. 1182208630Sjilles */ 1183208630Sjilles if (argc > 1 && strcmp(argv[1], "--") == 0) 1184208630Sjilles argc--, argv++; 11851556Srgrimes if (argc > 1) { 118617987Speter struct strlist *sp; 118717987Speter 11881556Srgrimes iflag = 0; /* exit on error */ 11891556Srgrimes mflag = 0; 11901556Srgrimes optschanged(); 119117987Speter for (sp = cmdenviron; sp ; sp = sp->next) 119217987Speter setvareq(sp->text, VEXPORT|VSTACK); 11931556Srgrimes shellexec(argv + 1, environment(), pathval(), 0); 11941556Srgrimes 11951556Srgrimes } 11961556Srgrimes return 0; 11971556Srgrimes} 1198153091Sstefanf 1199153091Sstefanf 1200153091Sstefanfint 1201153091Sstefanftimescmd(int argc __unused, char **argv __unused) 1202153091Sstefanf{ 1203153091Sstefanf struct rusage ru; 1204153091Sstefanf long shumins, shsmins, chumins, chsmins; 1205153091Sstefanf double shusecs, shssecs, chusecs, chssecs; 1206153091Sstefanf 1207153091Sstefanf if (getrusage(RUSAGE_SELF, &ru) < 0) 1208153091Sstefanf return 1; 1209153091Sstefanf shumins = ru.ru_utime.tv_sec / 60; 1210153091Sstefanf shusecs = ru.ru_utime.tv_sec % 60 + ru.ru_utime.tv_usec / 1000000.; 1211153091Sstefanf shsmins = ru.ru_stime.tv_sec / 60; 1212153091Sstefanf shssecs = ru.ru_stime.tv_sec % 60 + ru.ru_stime.tv_usec / 1000000.; 1213153091Sstefanf if (getrusage(RUSAGE_CHILDREN, &ru) < 0) 1214153091Sstefanf return 1; 1215153091Sstefanf chumins = ru.ru_utime.tv_sec / 60; 1216153091Sstefanf chusecs = ru.ru_utime.tv_sec % 60 + ru.ru_utime.tv_usec / 1000000.; 1217153091Sstefanf chsmins = ru.ru_stime.tv_sec / 60; 1218153091Sstefanf chssecs = ru.ru_stime.tv_sec % 60 + ru.ru_stime.tv_usec / 1000000.; 1219153091Sstefanf out1fmt("%ldm%.3fs %ldm%.3fs\n%ldm%.3fs %ldm%.3fs\n", shumins, 1220153091Sstefanf shusecs, shsmins, shssecs, chumins, chusecs, chsmins, chssecs); 1221153091Sstefanf return 0; 1222153091Sstefanf} 1223