eval.c revision 214599
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 214599 2010-10-31 12:06:02Z 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 *); 97213811Sobrienstatic void evalcommand(union node *, int, struct backcmd *); 98213811Sobrienstatic 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; 199214599Sjilles union node *next; 200149927Sstefanf 201149927Sstefanf do_etest = 0; 2021556Srgrimes if (n == NULL) { 2031556Srgrimes TRACE(("evaltree(NULL) called\n")); 2041556Srgrimes exitstatus = 0; 2051556Srgrimes goto out; 2061556Srgrimes } 207214599Sjilles do { 208214599Sjilles next = NULL; 20917987Speter#ifndef NO_HISTORY 2101556Srgrimes displayhist = 1; /* show history substitutions done with fc */ 21117987Speter#endif 212149802Sstefanf TRACE(("evaltree(%p: %d) called\n", (void *)n, n->type)); 2131556Srgrimes switch (n->type) { 2141556Srgrimes case NSEMI: 215149932Sstefanf evaltree(n->nbinary.ch1, flags & ~EV_EXIT); 2161556Srgrimes if (evalskip) 2171556Srgrimes goto out; 218214599Sjilles next = n->nbinary.ch2; 2191556Srgrimes break; 2201556Srgrimes case NAND: 2211556Srgrimes evaltree(n->nbinary.ch1, EV_TESTED); 22218754Ssteve if (evalskip || exitstatus != 0) { 2231556Srgrimes goto out; 22418754Ssteve } 225214599Sjilles next = n->nbinary.ch2; 2261556Srgrimes break; 2271556Srgrimes case NOR: 2281556Srgrimes evaltree(n->nbinary.ch1, EV_TESTED); 2291556Srgrimes if (evalskip || exitstatus == 0) 2301556Srgrimes goto out; 231214599Sjilles next = n->nbinary.ch2; 2321556Srgrimes break; 2331556Srgrimes case NREDIR: 234205154Sjilles evalredir(n, flags); 2351556Srgrimes break; 2361556Srgrimes case NSUBSHELL: 2371556Srgrimes evalsubshell(n, flags); 238149927Sstefanf do_etest = !(flags & EV_TESTED); 2391556Srgrimes break; 2401556Srgrimes case NBACKGND: 2411556Srgrimes evalsubshell(n, flags); 2421556Srgrimes break; 2431556Srgrimes case NIF: { 2441556Srgrimes evaltree(n->nif.test, EV_TESTED); 2451556Srgrimes if (evalskip) 2461556Srgrimes goto out; 24720425Ssteve if (exitstatus == 0) 248214599Sjilles next = n->nif.ifpart; 24917987Speter else if (n->nif.elsepart) 250214599Sjilles next = n->nif.elsepart; 25120425Ssteve else 25220425Ssteve exitstatus = 0; 2531556Srgrimes break; 2541556Srgrimes } 2551556Srgrimes case NWHILE: 2561556Srgrimes case NUNTIL: 257149933Sstefanf evalloop(n, flags & ~EV_EXIT); 2581556Srgrimes break; 2591556Srgrimes case NFOR: 260149933Sstefanf evalfor(n, flags & ~EV_EXIT); 2611556Srgrimes break; 2621556Srgrimes case NCASE: 2631556Srgrimes evalcase(n, flags); 2641556Srgrimes break; 2651556Srgrimes case NDEFUN: 2661556Srgrimes defun(n->narg.text, n->narg.next); 2671556Srgrimes exitstatus = 0; 2681556Srgrimes break; 2691556Srgrimes case NNOT: 2701556Srgrimes evaltree(n->nnot.com, EV_TESTED); 2711556Srgrimes exitstatus = !exitstatus; 2721556Srgrimes break; 2731556Srgrimes 2741556Srgrimes case NPIPE: 2751556Srgrimes evalpipe(n); 276149927Sstefanf do_etest = !(flags & EV_TESTED); 2771556Srgrimes break; 2781556Srgrimes case NCMD: 2791556Srgrimes evalcommand(n, flags, (struct backcmd *)NULL); 280149927Sstefanf do_etest = !(flags & EV_TESTED); 2811556Srgrimes break; 2821556Srgrimes default: 2831556Srgrimes out1fmt("Node type = %d\n", n->type); 2841556Srgrimes flushout(&output); 2851556Srgrimes break; 2861556Srgrimes } 287214599Sjilles n = next; 288214599Sjilles } while (n != NULL); 2891556Srgrimesout: 2901556Srgrimes if (pendingsigs) 2911556Srgrimes dotrap(); 292149927Sstefanf if ((flags & EV_EXIT) || (eflag && exitstatus != 0 && do_etest)) 2931556Srgrimes exitshell(exitstatus); 2941556Srgrimes} 2951556Srgrimes 2961556Srgrimes 297213811Sobrienstatic void 298149933Sstefanfevalloop(union node *n, int flags) 29917987Speter{ 3001556Srgrimes int status; 3011556Srgrimes 3021556Srgrimes loopnest++; 3031556Srgrimes status = 0; 3041556Srgrimes for (;;) { 3051556Srgrimes evaltree(n->nbinary.ch1, EV_TESTED); 3061556Srgrimes if (evalskip) { 3071556Srgrimesskipping: if (evalskip == SKIPCONT && --skipcount <= 0) { 3081556Srgrimes evalskip = 0; 3091556Srgrimes continue; 3101556Srgrimes } 3111556Srgrimes if (evalskip == SKIPBREAK && --skipcount <= 0) 3121556Srgrimes evalskip = 0; 313212475Sjilles if (evalskip == SKIPFUNC || evalskip == SKIPFILE) 314212475Sjilles status = exitstatus; 3151556Srgrimes break; 3161556Srgrimes } 3171556Srgrimes if (n->type == NWHILE) { 3181556Srgrimes if (exitstatus != 0) 3191556Srgrimes break; 3201556Srgrimes } else { 3211556Srgrimes if (exitstatus == 0) 3221556Srgrimes break; 3231556Srgrimes } 324149933Sstefanf evaltree(n->nbinary.ch2, flags); 3251556Srgrimes status = exitstatus; 3261556Srgrimes if (evalskip) 3271556Srgrimes goto skipping; 3281556Srgrimes } 3291556Srgrimes loopnest--; 3301556Srgrimes exitstatus = status; 3311556Srgrimes} 3321556Srgrimes 3331556Srgrimes 3341556Srgrimes 335213811Sobrienstatic void 336149933Sstefanfevalfor(union node *n, int flags) 33717987Speter{ 3381556Srgrimes struct arglist arglist; 3391556Srgrimes union node *argp; 3401556Srgrimes struct strlist *sp; 3411556Srgrimes struct stackmark smark; 3421556Srgrimes 3431556Srgrimes setstackmark(&smark); 3441556Srgrimes arglist.lastp = &arglist.list; 3451556Srgrimes for (argp = n->nfor.args ; argp ; argp = argp->narg.next) { 34617987Speter oexitstatus = exitstatus; 3471556Srgrimes expandarg(argp, &arglist, EXP_FULL | EXP_TILDE); 3481556Srgrimes if (evalskip) 3491556Srgrimes goto out; 3501556Srgrimes } 3511556Srgrimes *arglist.lastp = NULL; 3521556Srgrimes 3531556Srgrimes exitstatus = 0; 3541556Srgrimes loopnest++; 3551556Srgrimes for (sp = arglist.list ; sp ; sp = sp->next) { 3561556Srgrimes setvar(n->nfor.var, sp->text, 0); 357149933Sstefanf evaltree(n->nfor.body, flags); 3581556Srgrimes if (evalskip) { 3591556Srgrimes if (evalskip == SKIPCONT && --skipcount <= 0) { 3601556Srgrimes evalskip = 0; 3611556Srgrimes continue; 3621556Srgrimes } 3631556Srgrimes if (evalskip == SKIPBREAK && --skipcount <= 0) 3641556Srgrimes evalskip = 0; 3651556Srgrimes break; 3661556Srgrimes } 3671556Srgrimes } 3681556Srgrimes loopnest--; 3691556Srgrimesout: 3701556Srgrimes popstackmark(&smark); 3711556Srgrimes} 3721556Srgrimes 3731556Srgrimes 3741556Srgrimes 375213811Sobrienstatic void 37690111Simpevalcase(union node *n, int flags) 37717987Speter{ 3781556Srgrimes union node *cp; 3791556Srgrimes union node *patp; 3801556Srgrimes struct arglist arglist; 3811556Srgrimes struct stackmark smark; 3821556Srgrimes 3831556Srgrimes setstackmark(&smark); 3841556Srgrimes arglist.lastp = &arglist.list; 38517987Speter oexitstatus = exitstatus; 386172440Sstefanf exitstatus = 0; 3871556Srgrimes expandarg(n->ncase.expr, &arglist, EXP_TILDE); 3881556Srgrimes for (cp = n->ncase.cases ; cp && evalskip == 0 ; cp = cp->nclist.next) { 3891556Srgrimes for (patp = cp->nclist.pattern ; patp ; patp = patp->narg.next) { 3901556Srgrimes if (casematch(patp, arglist.list->text)) { 3911556Srgrimes if (evalskip == 0) { 3921556Srgrimes evaltree(cp->nclist.body, flags); 3931556Srgrimes } 3941556Srgrimes goto out; 3951556Srgrimes } 3961556Srgrimes } 3971556Srgrimes } 3981556Srgrimesout: 3991556Srgrimes popstackmark(&smark); 4001556Srgrimes} 4011556Srgrimes 4021556Srgrimes 4031556Srgrimes 4041556Srgrimes/* 4051556Srgrimes * Kick off a subshell to evaluate a tree. 4061556Srgrimes */ 4071556Srgrimes 408213811Sobrienstatic void 40990111Simpevalsubshell(union node *n, int flags) 41017987Speter{ 4111556Srgrimes struct job *jp; 4121556Srgrimes int backgnd = (n->type == NBACKGND); 4131556Srgrimes 4141556Srgrimes expredir(n->nredir.redirect); 415194774Sjilles if ((!backgnd && flags & EV_EXIT && !have_traps()) || 416194774Sjilles forkshell(jp = makejob(n, 1), n, backgnd) == 0) { 4171556Srgrimes if (backgnd) 4181556Srgrimes flags &=~ EV_TESTED; 4191556Srgrimes redirect(n->nredir.redirect, 0); 4201556Srgrimes evaltree(n->nredir.n, flags | EV_EXIT); /* never returns */ 421201053Sjilles } else if (! backgnd) { 4221556Srgrimes INTOFF; 42345916Scracauer exitstatus = waitforjob(jp, (int *)NULL); 4241556Srgrimes INTON; 4251556Srgrimes } 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 440205154Sjilles expredir(n->nredir.redirect); 441205154Sjilles savehandler = handler; 442205154Sjilles if (setjmp(jmploc.loc)) { 443205154Sjilles int e; 444205154Sjilles 445205154Sjilles handler = savehandler; 446205154Sjilles e = exception; 447205154Sjilles if (e == EXERROR || e == EXEXEC) { 448205154Sjilles popredir(); 449205154Sjilles if (in_redirect) { 450205154Sjilles exitstatus = 2; 451205154Sjilles return; 452205154Sjilles } 453205154Sjilles } 454205154Sjilles longjmp(handler->loc, 1); 455205154Sjilles } else { 456205154Sjilles INTOFF; 457205154Sjilles handler = &jmploc; 458205154Sjilles redirect(n->nredir.redirect, REDIR_PUSH); 459205154Sjilles in_redirect = 0; 460205154Sjilles INTON; 461205154Sjilles evaltree(n->nredir.n, flags); 462205154Sjilles } 463205154Sjilles INTOFF; 464205154Sjilles handler = savehandler; 465205154Sjilles popredir(); 466205154Sjilles INTON; 467205154Sjilles} 468205154Sjilles 469205154Sjilles 4701556Srgrimes/* 4711556Srgrimes * Compute the names of the files in a redirection list. 4721556Srgrimes */ 4731556Srgrimes 474213811Sobrienstatic void 47590111Simpexpredir(union node *n) 47617987Speter{ 47725222Ssteve union node *redir; 4781556Srgrimes 4791556Srgrimes for (redir = n ; redir ; redir = redir->nfile.next) { 48017987Speter struct arglist fn; 48117987Speter fn.lastp = &fn.list; 48217987Speter oexitstatus = exitstatus; 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]; 5561556Srgrimes close(pip[1]); 5571556Srgrimes } 5581556Srgrimes INTON; 5591556Srgrimes if (n->npipe.backgnd == 0) { 5601556Srgrimes INTOFF; 56145916Scracauer exitstatus = waitforjob(jp, (int *)NULL); 5621556Srgrimes TRACE(("evalpipe: job done exit status %d\n", exitstatus)); 5631556Srgrimes INTON; 5641556Srgrimes } 5651556Srgrimes} 5661556Srgrimes 5671556Srgrimes 5681556Srgrimes 5691556Srgrimes/* 5701556Srgrimes * Execute a command inside back quotes. If it's a builtin command, we 5711556Srgrimes * want to save its output in a block obtained from malloc. Otherwise 5721556Srgrimes * we fork off a subprocess and get the output of the command via a pipe. 5731556Srgrimes * Should be called with interrupts off. 5741556Srgrimes */ 5751556Srgrimes 5761556Srgrimesvoid 57790111Simpevalbackcmd(union node *n, struct backcmd *result) 57817987Speter{ 5791556Srgrimes int pip[2]; 5801556Srgrimes struct job *jp; 5811556Srgrimes struct stackmark smark; /* unnecessary */ 5821556Srgrimes 5831556Srgrimes setstackmark(&smark); 5841556Srgrimes result->fd = -1; 5851556Srgrimes result->buf = NULL; 5861556Srgrimes result->nleft = 0; 5871556Srgrimes result->jp = NULL; 58817987Speter if (n == NULL) { 58917987Speter exitstatus = 0; 5901556Srgrimes goto out; 59117987Speter } 5921556Srgrimes if (n->type == NCMD) { 59317987Speter exitstatus = oexitstatus; 5941556Srgrimes evalcommand(n, EV_BACKCMD, result); 5951556Srgrimes } else { 59617987Speter exitstatus = 0; 5971556Srgrimes if (pipe(pip) < 0) 59853891Scracauer error("Pipe call failed: %s", strerror(errno)); 5991556Srgrimes jp = makejob(n, 1); 6001556Srgrimes if (forkshell(jp, n, FORK_NOJOB) == 0) { 6011556Srgrimes FORCEINTON; 6021556Srgrimes close(pip[0]); 6031556Srgrimes if (pip[1] != 1) { 604124780Sdes dup2(pip[1], 1); 6051556Srgrimes close(pip[1]); 6061556Srgrimes } 6071556Srgrimes evaltree(n, EV_EXIT); 6081556Srgrimes } 6091556Srgrimes close(pip[1]); 6101556Srgrimes result->fd = pip[0]; 6111556Srgrimes result->jp = jp; 6121556Srgrimes } 6131556Srgrimesout: 6141556Srgrimes popstackmark(&smark); 615109627Stjr TRACE(("evalbackcmd done: fd=%d buf=%p nleft=%d jp=%p\n", 6161556Srgrimes result->fd, result->buf, result->nleft, result->jp)); 6171556Srgrimes} 6181556Srgrimes 6191556Srgrimes 6201556Srgrimes 6211556Srgrimes/* 6221556Srgrimes * Execute a simple command. 6231556Srgrimes */ 6241556Srgrimes 625213811Sobrienstatic void 62690111Simpevalcommand(union node *cmd, int flags, struct backcmd *backcmd) 62717987Speter{ 6281556Srgrimes struct stackmark smark; 6291556Srgrimes union node *argp; 6301556Srgrimes struct arglist arglist; 6311556Srgrimes struct arglist varlist; 6321556Srgrimes char **argv; 6331556Srgrimes int argc; 6341556Srgrimes char **envp; 6351556Srgrimes int varflag; 6361556Srgrimes struct strlist *sp; 6371556Srgrimes int mode; 6381556Srgrimes int pip[2]; 6391556Srgrimes struct cmdentry cmdentry; 6401556Srgrimes struct job *jp; 6411556Srgrimes struct jmploc jmploc; 642194765Sjilles struct jmploc *savehandler; 643194765Sjilles char *savecmdname; 644194765Sjilles struct shparam saveparam; 645194765Sjilles struct localvar *savelocalvars; 646199647Sjilles struct parsefile *savetopfile; 6471556Srgrimes volatile int e; 6481556Srgrimes char *lastarg; 64945916Scracauer int realstatus; 65054884Scracauer int do_clearcmdentry; 651211287Sjilles const char *path = pathval(); 6521556Srgrimes 6531556Srgrimes /* First expand the arguments. */ 654149802Sstefanf TRACE(("evalcommand(%p, %d) called\n", (void *)cmd, flags)); 6551556Srgrimes setstackmark(&smark); 6561556Srgrimes arglist.lastp = &arglist.list; 6571556Srgrimes varlist.lastp = &varlist.list; 6581556Srgrimes varflag = 1; 65954884Scracauer do_clearcmdentry = 0; 66017987Speter oexitstatus = exitstatus; 66117987Speter exitstatus = 0; 6621556Srgrimes for (argp = cmd->ncmd.args ; argp ; argp = argp->narg.next) { 66317987Speter char *p = argp->narg.text; 6641556Srgrimes if (varflag && is_name(*p)) { 6651556Srgrimes do { 6661556Srgrimes p++; 6671556Srgrimes } while (is_in_name(*p)); 6681556Srgrimes if (*p == '=') { 6691556Srgrimes expandarg(argp, &varlist, EXP_VARTILDE); 6701556Srgrimes continue; 6711556Srgrimes } 6721556Srgrimes } 6731556Srgrimes expandarg(argp, &arglist, EXP_FULL | EXP_TILDE); 6741556Srgrimes varflag = 0; 6751556Srgrimes } 6761556Srgrimes *arglist.lastp = NULL; 6771556Srgrimes *varlist.lastp = NULL; 6781556Srgrimes expredir(cmd->ncmd.redirect); 6791556Srgrimes argc = 0; 6801556Srgrimes for (sp = arglist.list ; sp ; sp = sp->next) 6811556Srgrimes argc++; 6821556Srgrimes argv = stalloc(sizeof (char *) * (argc + 1)); 6831556Srgrimes 6841556Srgrimes for (sp = arglist.list ; sp ; sp = sp->next) { 6851556Srgrimes TRACE(("evalcommand arg: %s\n", sp->text)); 6861556Srgrimes *argv++ = sp->text; 6871556Srgrimes } 6881556Srgrimes *argv = NULL; 6891556Srgrimes lastarg = NULL; 6901556Srgrimes if (iflag && funcnest == 0 && argc > 0) 6911556Srgrimes lastarg = argv[-1]; 6921556Srgrimes argv -= argc; 6931556Srgrimes 6941556Srgrimes /* Print the command if xflag is set. */ 6951556Srgrimes if (xflag) { 696159632Sstefanf char sep = 0; 697194786Sjilles const char *p; 698159632Sstefanf out2str(ps4val()); 6991556Srgrimes for (sp = varlist.list ; sp ; sp = sp->next) { 700159632Sstefanf if (sep != 0) 701201366Sjilles out2c(' '); 702194786Sjilles p = sp->text; 703194786Sjilles while (*p != '=' && *p != '\0') 704194786Sjilles out2c(*p++); 705194786Sjilles if (*p != '\0') { 706194786Sjilles out2c(*p++); 707194786Sjilles out2qstr(p); 708194786Sjilles } 709159632Sstefanf sep = ' '; 7101556Srgrimes } 7111556Srgrimes for (sp = arglist.list ; sp ; sp = sp->next) { 712159632Sstefanf if (sep != 0) 713201366Sjilles out2c(' '); 714194786Sjilles /* Disambiguate command looking like assignment. */ 715194786Sjilles if (sp == arglist.list && 716194786Sjilles strchr(sp->text, '=') != NULL && 717194786Sjilles strchr(sp->text, '\'') == NULL) { 718194786Sjilles out2c('\''); 719194786Sjilles out2str(sp->text); 720194786Sjilles out2c('\''); 721194786Sjilles } else 722194786Sjilles out2qstr(sp->text); 723159632Sstefanf sep = ' '; 7241556Srgrimes } 725201366Sjilles out2c('\n'); 7261556Srgrimes flushout(&errout); 7271556Srgrimes } 7281556Srgrimes 7291556Srgrimes /* Now locate the command. */ 7301556Srgrimes if (argc == 0) { 731157601Sstefanf /* Variable assignment(s) without command */ 7321556Srgrimes cmdentry.cmdtype = CMDBUILTIN; 7331556Srgrimes cmdentry.u.index = BLTINCMD; 734205138Sjilles cmdentry.special = 0; 7351556Srgrimes } else { 73617987Speter static const char PATH[] = "PATH="; 737204800Sjilles int cmd_flags = 0, bltinonly = 0; 73817987Speter 73917987Speter /* 74017987Speter * Modify the command lookup path, if a PATH= assignment 74117987Speter * is present 74217987Speter */ 74317987Speter for (sp = varlist.list ; sp ; sp = sp->next) 74454884Scracauer if (strncmp(sp->text, PATH, sizeof(PATH) - 1) == 0) { 74517987Speter path = sp->text + sizeof(PATH) - 1; 746155301Sschweikh /* 74754884Scracauer * On `PATH=... command`, we need to make 74854884Scracauer * sure that the command isn't using the 74954884Scracauer * non-updated hash table of the outer PATH 750155301Sschweikh * setting and we need to make sure that 75154884Scracauer * the hash table isn't filled with items 75254884Scracauer * from the temporary setting. 75354884Scracauer * 754155301Sschweikh * It would be better to forbit using and 75554884Scracauer * updating the table while this command 75654884Scracauer * runs, by the command finding mechanism 75754884Scracauer * is heavily integrated with hash handling, 75854884Scracauer * so we just delete the hash before and after 75954884Scracauer * the command runs. Partly deleting like 76054884Scracauer * changepatch() does doesn't seem worth the 76154884Scracauer * bookinging effort, since most such runs add 762123996Smaxim * directories in front of the new PATH. 76354884Scracauer */ 76454884Scracauer clearcmdentry(0); 76554884Scracauer do_clearcmdentry = 1; 76654884Scracauer } 76717987Speter 768204800Sjilles for (;;) { 769204800Sjilles if (bltinonly) { 770204800Sjilles cmdentry.u.index = find_builtin(*argv, &cmdentry.special); 771204800Sjilles if (cmdentry.u.index < 0) { 772201431Sjilles cmdentry.u.index = BLTINCMD; 773201431Sjilles argv--; 774201431Sjilles argc++; 775201431Sjilles break; 7761556Srgrimes } 777204800Sjilles } else 778204800Sjilles find_command(argv[0], &cmdentry, cmd_flags, path); 779204800Sjilles /* implement the bltin and command builtins here */ 780204800Sjilles if (cmdentry.cmdtype != CMDBUILTIN) 781204800Sjilles break; 782204800Sjilles if (cmdentry.u.index == BLTINCMD) { 783204800Sjilles if (argc == 1) 7841556Srgrimes break; 785204800Sjilles argv++; 786204800Sjilles argc--; 787204800Sjilles bltinonly = 1; 788204800Sjilles } else if (cmdentry.u.index == COMMANDCMD) { 789204800Sjilles if (argc == 1) 790204800Sjilles break; 791204800Sjilles if (!strcmp(argv[1], "-p")) { 792204800Sjilles if (argc == 2) 793204800Sjilles break; 794204800Sjilles if (argv[2][0] == '-') { 795204800Sjilles if (strcmp(argv[2], "--")) 796204800Sjilles break; 797204800Sjilles if (argc == 3) 798204800Sjilles break; 799204800Sjilles argv += 3; 800204800Sjilles argc -= 3; 801204800Sjilles } else { 802204800Sjilles argv += 2; 803204800Sjilles argc -= 2; 804204800Sjilles } 805204800Sjilles path = _PATH_STDPATH; 806204800Sjilles clearcmdentry(0); 807204800Sjilles do_clearcmdentry = 1; 808204800Sjilles } else if (!strcmp(argv[1], "--")) { 809204800Sjilles if (argc == 2) 810204800Sjilles break; 811204800Sjilles argv += 2; 812204800Sjilles argc -= 2; 813204800Sjilles } else if (argv[1][0] == '-') 814204800Sjilles break; 815204800Sjilles else { 816204800Sjilles argv++; 817204800Sjilles argc--; 818204800Sjilles } 819204800Sjilles cmd_flags |= DO_NOFUNC; 820204800Sjilles bltinonly = 0; 821204800Sjilles } else 822204800Sjilles break; 8231556Srgrimes } 824204800Sjilles /* 825204800Sjilles * Special builtins lose their special properties when 826204800Sjilles * called via 'command'. 827204800Sjilles */ 828204800Sjilles if (cmd_flags & DO_NOFUNC) 829204800Sjilles cmdentry.special = 0; 8301556Srgrimes } 8311556Srgrimes 8321556Srgrimes /* Fork off a child process if necessary. */ 8331556Srgrimes if (cmd->ncmd.backgnd 834197820Sjilles || ((cmdentry.cmdtype == CMDNORMAL || cmdentry.cmdtype == CMDUNKNOWN) 835194127Sjilles && ((flags & EV_EXIT) == 0 || have_traps())) 83617987Speter || ((flags & EV_BACKCMD) != 0 8371556Srgrimes && (cmdentry.cmdtype != CMDBUILTIN 83848896Ssheldonh || cmdentry.u.index == CDCMD 8391556Srgrimes || cmdentry.u.index == DOTCMD 840204800Sjilles || cmdentry.u.index == EVALCMD))) { 8411556Srgrimes jp = makejob(cmd, 1); 8421556Srgrimes mode = cmd->ncmd.backgnd; 8431556Srgrimes if (flags & EV_BACKCMD) { 8441556Srgrimes mode = FORK_NOJOB; 8451556Srgrimes if (pipe(pip) < 0) 84653891Scracauer error("Pipe call failed: %s", strerror(errno)); 8471556Srgrimes } 8481556Srgrimes if (forkshell(jp, cmd, mode) != 0) 8491556Srgrimes goto parent; /* at end of routine */ 8501556Srgrimes if (flags & EV_BACKCMD) { 8511556Srgrimes FORCEINTON; 8521556Srgrimes close(pip[0]); 8531556Srgrimes if (pip[1] != 1) { 854124780Sdes dup2(pip[1], 1); 8551556Srgrimes close(pip[1]); 8561556Srgrimes } 8571556Srgrimes } 8581556Srgrimes flags |= EV_EXIT; 8591556Srgrimes } 8601556Srgrimes 8611556Srgrimes /* This is the child process if a fork occurred. */ 8621556Srgrimes /* Execute the command. */ 8631556Srgrimes if (cmdentry.cmdtype == CMDFUNCTION) { 86420425Ssteve#ifdef DEBUG 8651556Srgrimes trputs("Shell function: "); trargs(argv); 86620425Ssteve#endif 8671556Srgrimes saveparam = shellparam; 8681556Srgrimes shellparam.malloc = 0; 86920425Ssteve shellparam.reset = 1; 8701556Srgrimes shellparam.nparam = argc - 1; 8711556Srgrimes shellparam.p = argv + 1; 8721556Srgrimes shellparam.optnext = NULL; 8731556Srgrimes INTOFF; 8741556Srgrimes savelocalvars = localvars; 8751556Srgrimes localvars = NULL; 876196483Sjilles reffunc(cmdentry.u.func); 877194765Sjilles savehandler = handler; 8781556Srgrimes if (setjmp(jmploc.loc)) { 8791556Srgrimes if (exception == EXSHELLPROC) 880194765Sjilles freeparam(&saveparam); 8811556Srgrimes else { 8821556Srgrimes freeparam(&shellparam); 8831556Srgrimes shellparam = saveparam; 884204802Sjilles if (exception == EXERROR || exception == EXEXEC) 885204802Sjilles popredir(); 8861556Srgrimes } 887196483Sjilles unreffunc(cmdentry.u.func); 8881556Srgrimes poplocalvars(); 8891556Srgrimes localvars = savelocalvars; 890201283Sjilles funcnest--; 8911556Srgrimes handler = savehandler; 8921556Srgrimes longjmp(handler->loc, 1); 8931556Srgrimes } 8941556Srgrimes handler = &jmploc; 895201283Sjilles funcnest++; 896204802Sjilles redirect(cmd->ncmd.redirect, REDIR_PUSH); 897199660Sjilles INTON; 8981556Srgrimes for (sp = varlist.list ; sp ; sp = sp->next) 8991556Srgrimes mklocal(sp->text); 900185231Sstefanf exitstatus = oexitstatus; 90135675Scracauer if (flags & EV_TESTED) 902196634Sjilles evaltree(getfuncnode(cmdentry.u.func), EV_TESTED); 90335675Scracauer else 904196634Sjilles evaltree(getfuncnode(cmdentry.u.func), 0); 9051556Srgrimes INTOFF; 906196483Sjilles unreffunc(cmdentry.u.func); 9071556Srgrimes poplocalvars(); 9081556Srgrimes localvars = savelocalvars; 9091556Srgrimes freeparam(&shellparam); 9101556Srgrimes shellparam = saveparam; 9111556Srgrimes handler = savehandler; 912201283Sjilles funcnest--; 9131556Srgrimes popredir(); 9141556Srgrimes INTON; 9151556Srgrimes if (evalskip == SKIPFUNC) { 9161556Srgrimes evalskip = 0; 9171556Srgrimes skipcount = 0; 9181556Srgrimes } 9191556Srgrimes if (flags & EV_EXIT) 9201556Srgrimes exitshell(exitstatus); 9211556Srgrimes } else if (cmdentry.cmdtype == CMDBUILTIN) { 92220425Ssteve#ifdef DEBUG 9231556Srgrimes trputs("builtin command: "); trargs(argv); 92420425Ssteve#endif 9251556Srgrimes mode = (cmdentry.u.index == EXECCMD)? 0 : REDIR_PUSH; 9261556Srgrimes if (flags == EV_BACKCMD) { 9271556Srgrimes memout.nleft = 0; 9281556Srgrimes memout.nextc = memout.buf; 9291556Srgrimes memout.bufsize = 64; 9301556Srgrimes mode |= REDIR_BACKQ; 931201366Sjilles cmdentry.special = 0; 9321556Srgrimes } 9331556Srgrimes savecmdname = commandname; 934199647Sjilles savetopfile = getcurrentfile(); 9351556Srgrimes cmdenviron = varlist.list; 9361556Srgrimes e = -1; 937194765Sjilles savehandler = handler; 9381556Srgrimes if (setjmp(jmploc.loc)) { 9391556Srgrimes e = exception; 9401556Srgrimes exitstatus = (e == EXINT)? SIGINT+128 : 2; 9411556Srgrimes goto cmddone; 9421556Srgrimes } 9431556Srgrimes handler = &jmploc; 944157601Sstefanf redirect(cmd->ncmd.redirect, mode); 945205138Sjilles /* 946205138Sjilles * If there is no command word, redirection errors should 947205138Sjilles * not be fatal but assignment errors should. 948205138Sjilles */ 949205138Sjilles if (argc == 0 && !(flags & EV_BACKCMD)) 950205138Sjilles cmdentry.special = 1; 951157601Sstefanf if (cmdentry.special) 952157601Sstefanf listsetvar(cmdenviron); 953207678Sjilles if (argc > 0) 954207678Sjilles bltinsetlocale(); 9551556Srgrimes commandname = argv[0]; 9561556Srgrimes argptr = argv + 1; 957201053Sjilles nextopt_optptr = NULL; /* initialize nextopt */ 958193169Sstefanf builtin_flags = flags; 9591556Srgrimes exitstatus = (*builtinfunc[cmdentry.u.index])(argc, argv); 9601556Srgrimes flushall(); 9611556Srgrimescmddone: 962207678Sjilles if (argc > 0) 963207678Sjilles bltinunsetlocale(); 96460592Scracauer cmdenviron = NULL; 9651556Srgrimes out1 = &output; 9661556Srgrimes out2 = &errout; 9671556Srgrimes freestdout(); 9681556Srgrimes if (e != EXSHELLPROC) { 9691556Srgrimes commandname = savecmdname; 9701556Srgrimes if (flags & EV_EXIT) { 9711556Srgrimes exitshell(exitstatus); 9721556Srgrimes } 9731556Srgrimes } 9741556Srgrimes handler = savehandler; 975201366Sjilles if (flags == EV_BACKCMD) { 976201366Sjilles backcmd->buf = memout.buf; 977201366Sjilles backcmd->nleft = memout.nextc - memout.buf; 978201366Sjilles memout.buf = NULL; 979201366Sjilles } 980204801Sjilles if (cmdentry.u.index != EXECCMD && 981204801Sjilles (e == -1 || e == EXERROR || e == EXEXEC)) 982204801Sjilles popredir(); 9831556Srgrimes if (e != -1) { 98420425Ssteve if ((e != EXERROR && e != EXEXEC) 985157601Sstefanf || cmdentry.special) 9861556Srgrimes exraise(e); 987199647Sjilles popfilesupto(savetopfile); 988201366Sjilles if (flags != EV_BACKCMD) 989201366Sjilles FORCEINTON; 9901556Srgrimes } 9911556Srgrimes } else { 99220425Ssteve#ifdef DEBUG 9931556Srgrimes trputs("normal command: "); trargs(argv); 99420425Ssteve#endif 9951556Srgrimes redirect(cmd->ncmd.redirect, 0); 9961556Srgrimes for (sp = varlist.list ; sp ; sp = sp->next) 9971556Srgrimes setvareq(sp->text, VEXPORT|VSTACK); 9981556Srgrimes envp = environment(); 999204800Sjilles shellexec(argv, envp, path, cmdentry.u.index); 10001556Srgrimes /*NOTREACHED*/ 10011556Srgrimes } 10021556Srgrimes goto out; 10031556Srgrimes 10041556Srgrimesparent: /* parent process gets here (if we forked) */ 1005212214Sjilles if (mode == FORK_FG) { /* argument to fork */ 10061556Srgrimes INTOFF; 100745916Scracauer exitstatus = waitforjob(jp, &realstatus); 10081556Srgrimes INTON; 100945916Scracauer if (iflag && loopnest > 0 && WIFSIGNALED(realstatus)) { 101045266Scracauer evalskip = SKIPBREAK; 101145266Scracauer skipcount = loopnest; 101245266Scracauer } 1013212214Sjilles } else if (mode == FORK_NOJOB) { 10141556Srgrimes backcmd->fd = pip[0]; 10151556Srgrimes close(pip[1]); 10161556Srgrimes backcmd->jp = jp; 10171556Srgrimes } 10181556Srgrimes 10191556Srgrimesout: 10201556Srgrimes if (lastarg) 10211556Srgrimes setvar("_", lastarg, 0); 102254884Scracauer if (do_clearcmdentry) 102354884Scracauer clearcmdentry(0); 10241556Srgrimes popstackmark(&smark); 10251556Srgrimes} 10261556Srgrimes 10271556Srgrimes 10281556Srgrimes 10291556Srgrimes/* 10301556Srgrimes * Search for a command. This is called before we fork so that the 10311556Srgrimes * location of the command will be available in the parent as well as 10321556Srgrimes * the child. The check for "goodname" is an overly conservative 10331556Srgrimes * check that the name will not be subject to expansion. 10341556Srgrimes */ 10351556Srgrimes 1036213811Sobrienstatic void 103790111Simpprehash(union node *n) 103817987Speter{ 10391556Srgrimes struct cmdentry entry; 10401556Srgrimes 1041159633Sstefanf if (n && n->type == NCMD && n->ncmd.args) 104217987Speter if (goodname(n->ncmd.args->narg.text)) 104317987Speter find_command(n->ncmd.args->narg.text, &entry, 0, 104417987Speter pathval()); 10451556Srgrimes} 10461556Srgrimes 10471556Srgrimes 10481556Srgrimes 10491556Srgrimes/* 10501556Srgrimes * Builtin commands. Builtin commands whose functions are closely 10511556Srgrimes * tied to evaluation are implemented here. 10521556Srgrimes */ 10531556Srgrimes 10541556Srgrimes/* 1055201431Sjilles * No command given, a bltin command with no arguments, or a bltin command 1056201431Sjilles * with an invalid name. 10571556Srgrimes */ 10581556Srgrimes 105917987Speterint 1060201431Sjillesbltincmd(int argc, char **argv) 106117987Speter{ 1062201431Sjilles if (argc > 1) { 1063201431Sjilles out2fmt_flush("%s: not found\n", argv[1]); 1064201431Sjilles return 127; 1065201431Sjilles } 106620425Ssteve /* 106717987Speter * Preserve exitstatus of a previous possible redirection 106820425Ssteve * as POSIX mandates 106917987Speter */ 10701556Srgrimes return exitstatus; 10711556Srgrimes} 10721556Srgrimes 10731556Srgrimes 10741556Srgrimes/* 10751556Srgrimes * Handle break and continue commands. Break, continue, and return are 10761556Srgrimes * all handled by setting the evalskip flag. The evaluation routines 10771556Srgrimes * above all check this flag, and if it is set they start skipping 10781556Srgrimes * commands rather than executing them. The variable skipcount is 10791556Srgrimes * the number of loops to break/continue, or the number of function 10801556Srgrimes * levels to return. (The latter is always 1.) It should probably 10811556Srgrimes * be an error to break out of more loops than exist, but it isn't 10821556Srgrimes * in the standard shell so we don't make it one here. 10831556Srgrimes */ 10841556Srgrimes 108517987Speterint 108690111Simpbreakcmd(int argc, char **argv) 108717987Speter{ 108820425Ssteve int n = argc > 1 ? number(argv[1]) : 1; 10891556Srgrimes 10901556Srgrimes if (n > loopnest) 10911556Srgrimes n = loopnest; 10921556Srgrimes if (n > 0) { 10931556Srgrimes evalskip = (**argv == 'c')? SKIPCONT : SKIPBREAK; 10941556Srgrimes skipcount = n; 10951556Srgrimes } 10961556Srgrimes return 0; 10971556Srgrimes} 10981556Srgrimes 1099100437Stjr/* 1100100437Stjr * The `command' command. 1101100437Stjr */ 1102100437Stjrint 1103100437Stjrcommandcmd(int argc, char **argv) 1104100437Stjr{ 1105207783Sjilles const char *path; 1106100437Stjr int ch; 1107151810Sstefanf int cmd = -1; 11081556Srgrimes 1109204800Sjilles path = bltinlookup("PATH", 1); 1110100437Stjr 1111100437Stjr optind = optreset = 1; 1112100663Stjr opterr = 0; 1113151810Sstefanf while ((ch = getopt(argc, argv, "pvV")) != -1) { 1114100437Stjr switch (ch) { 1115100437Stjr case 'p': 1116207783Sjilles path = _PATH_STDPATH; 1117100437Stjr break; 1118151810Sstefanf case 'v': 1119151810Sstefanf cmd = TYPECMD_SMALLV; 1120151810Sstefanf break; 1121151810Sstefanf case 'V': 1122151810Sstefanf cmd = TYPECMD_BIGV; 1123151810Sstefanf break; 1124100437Stjr case '?': 1125100437Stjr default: 1126100437Stjr error("unknown option: -%c", optopt); 1127100437Stjr } 1128100437Stjr } 1129100437Stjr argc -= optind; 1130100437Stjr argv += optind; 1131100437Stjr 1132151810Sstefanf if (cmd != -1) { 1133151810Sstefanf if (argc != 1) 1134151810Sstefanf error("wrong number of arguments"); 1135201343Sjilles return typecmd_impl(2, argv - 1, cmd, path); 1136151810Sstefanf } 1137204800Sjilles if (argc != 0) 1138214538Sjilles error("commandcmd bad call"); 1139100437Stjr 1140100437Stjr /* 1141100437Stjr * Do nothing successfully if no command was specified; 1142100437Stjr * ksh also does this. 1143100437Stjr */ 1144204800Sjilles return 0; 1145100437Stjr} 1146100437Stjr 1147100437Stjr 11481556Srgrimes/* 11491556Srgrimes * The return command. 11501556Srgrimes */ 11511556Srgrimes 115217987Speterint 115390111Simpreturncmd(int argc, char **argv) 115417987Speter{ 115520425Ssteve int ret = argc > 1 ? number(argv[1]) : oexitstatus; 11561556Srgrimes 11571556Srgrimes if (funcnest) { 11581556Srgrimes evalskip = SKIPFUNC; 11591556Srgrimes skipcount = 1; 116020425Ssteve } else { 116120425Ssteve /* skip the rest of the file */ 116220425Ssteve evalskip = SKIPFILE; 116320425Ssteve skipcount = 1; 11641556Srgrimes } 11651556Srgrimes return ret; 11661556Srgrimes} 11671556Srgrimes 11681556Srgrimes 116917987Speterint 117090111Simpfalsecmd(int argc __unused, char **argv __unused) 117117987Speter{ 117217987Speter return 1; 117317987Speter} 117417987Speter 117517987Speter 117617987Speterint 117790111Simptruecmd(int argc __unused, char **argv __unused) 117817987Speter{ 11791556Srgrimes return 0; 11801556Srgrimes} 11811556Srgrimes 11821556Srgrimes 118317987Speterint 118490111Simpexeccmd(int argc, char **argv) 118517987Speter{ 1186208630Sjilles /* 1187208630Sjilles * Because we have historically not supported any options, 1188208630Sjilles * only treat "--" specially. 1189208630Sjilles */ 1190208630Sjilles if (argc > 1 && strcmp(argv[1], "--") == 0) 1191208630Sjilles argc--, argv++; 11921556Srgrimes if (argc > 1) { 119317987Speter struct strlist *sp; 119417987Speter 11951556Srgrimes iflag = 0; /* exit on error */ 11961556Srgrimes mflag = 0; 11971556Srgrimes optschanged(); 119817987Speter for (sp = cmdenviron; sp ; sp = sp->next) 119917987Speter setvareq(sp->text, VEXPORT|VSTACK); 12001556Srgrimes shellexec(argv + 1, environment(), pathval(), 0); 12011556Srgrimes 12021556Srgrimes } 12031556Srgrimes return 0; 12041556Srgrimes} 1205153091Sstefanf 1206153091Sstefanf 1207153091Sstefanfint 1208153091Sstefanftimescmd(int argc __unused, char **argv __unused) 1209153091Sstefanf{ 1210153091Sstefanf struct rusage ru; 1211153091Sstefanf long shumins, shsmins, chumins, chsmins; 1212153091Sstefanf double shusecs, shssecs, chusecs, chssecs; 1213153091Sstefanf 1214153091Sstefanf if (getrusage(RUSAGE_SELF, &ru) < 0) 1215153091Sstefanf return 1; 1216153091Sstefanf shumins = ru.ru_utime.tv_sec / 60; 1217153091Sstefanf shusecs = ru.ru_utime.tv_sec % 60 + ru.ru_utime.tv_usec / 1000000.; 1218153091Sstefanf shsmins = ru.ru_stime.tv_sec / 60; 1219153091Sstefanf shssecs = ru.ru_stime.tv_sec % 60 + ru.ru_stime.tv_usec / 1000000.; 1220153091Sstefanf if (getrusage(RUSAGE_CHILDREN, &ru) < 0) 1221153091Sstefanf return 1; 1222153091Sstefanf chumins = ru.ru_utime.tv_sec / 60; 1223153091Sstefanf chusecs = ru.ru_utime.tv_sec % 60 + ru.ru_utime.tv_usec / 1000000.; 1224153091Sstefanf chsmins = ru.ru_stime.tv_sec / 60; 1225153091Sstefanf chssecs = ru.ru_stime.tv_sec % 60 + ru.ru_stime.tv_usec / 1000000.; 1226153091Sstefanf out1fmt("%ldm%.3fs %ldm%.3fs\n%ldm%.3fs %ldm%.3fs\n", shumins, 1227153091Sstefanf shusecs, shsmins, shssecs, chumins, chusecs, chsmins, chssecs); 1228153091Sstefanf return 0; 1229153091Sstefanf} 1230