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Diffstat (limited to 'bin/1sh/eval.c')
| -rw-r--r-- | bin/1sh/eval.c | 1381 |
1 files changed, 0 insertions, 1381 deletions
diff --git a/bin/1sh/eval.c b/bin/1sh/eval.c deleted file mode 100644 index f4baf39e..00000000 --- a/bin/1sh/eval.c +++ /dev/null @@ -1,1381 +0,0 @@ -/*- - * Copyright (c) 1993 - * The Regents of the University of California. All rights reserved. - * - * This code is derived from software contributed to Berkeley by - * Kenneth Almquist. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - */ - -#ifndef lint -#if 0 -static char sccsid[] = "@(#)eval.c 8.9 (Berkeley) 6/8/95"; -#endif -#endif /* not lint */ -#include <sys/cdefs.h> -/* $FreeBSD: releng/12.1/bin/sh/eval.c 327212 2017-12-26 16:23:18Z jilles $ */ - -#include <paths.h> -#include <signal.h> -#include <stdlib.h> -#include <unistd.h> -#include <sys/resource.h> -#include <errno.h> - -/* - * Evaluate a command. - */ - -#include "shell.h" -#include "nodes.h" -#include "syntax.h" -#include "expand.h" -#include "parser.h" -#include "jobs.h" -#include "eval.h" -#include "builtins.h" -#include "options.h" -#include "exec.h" -#include "redir.h" -#include "input.h" -#include "output.h" -#include "trap.h" -#include "var.h" -#include "memalloc.h" -#include "error.h" -#include "show.h" -#include "mystring.h" -#ifndef NO_HISTORY -#include "myhistedit.h" -#endif - - -int evalskip; /* set if we are skipping commands */ -int skipcount; /* number of levels to skip */ -static int loopnest; /* current loop nesting level */ -int funcnest; /* depth of function calls */ -static int builtin_flags; /* evalcommand flags for builtins */ - - -char *commandname; -struct arglist *cmdenviron; -int exitstatus; /* exit status of last command */ -int oexitstatus; /* saved exit status */ - - -static void evalloop(union node *, int); -static void evalfor(union node *, int); -static union node *evalcase(union node *); -static void evalsubshell(union node *, int); -static void evalredir(union node *, int); -static void exphere(union node *, struct arglist *); -static void expredir(union node *); -static void evalpipe(union node *); -static int is_valid_fast_cmdsubst(union node *n); -static void evalcommand(union node *, int, struct backcmd *); -static void prehash(union node *); - - -/* - * Called to reset things after an exception. - */ - -void -reseteval(void) -{ - evalskip = 0; - loopnest = 0; -} - - -/* - * The eval command. - */ - -int -evalcmd(int argc, char **argv) -{ - char *p; - char *concat; - char **ap; - - if (argc > 1) { - p = argv[1]; - if (argc > 2) { - STARTSTACKSTR(concat); - ap = argv + 2; - for (;;) { - STPUTS(p, concat); - if ((p = *ap++) == NULL) - break; - STPUTC(' ', concat); - } - STPUTC('\0', concat); - p = grabstackstr(concat); - } - evalstring(p, builtin_flags); - } else - exitstatus = 0; - return exitstatus; -} - - -/* - * Execute a command or commands contained in a string. - */ - -void -evalstring(const char *s, int flags) -{ - union node *n; - struct stackmark smark; - int flags_exit; - int any; - - flags_exit = flags & EV_EXIT; - flags &= ~EV_EXIT; - any = 0; - setstackmark(&smark); - setinputstring(s, 1); - while ((n = parsecmd(0)) != NEOF) { - if (n != NULL && !nflag) { - if (flags_exit && preadateof()) - evaltree(n, flags | EV_EXIT); - else - evaltree(n, flags); - any = 1; - if (evalskip) - break; - } - popstackmark(&smark); - setstackmark(&smark); - } - popfile(); - popstackmark(&smark); - if (!any) - exitstatus = 0; - if (flags_exit) - exraise(EXEXIT); -} - - -/* - * Evaluate a parse tree. The value is left in the global variable - * exitstatus. - */ - -void -evaltree(union node *n, int flags) -{ - int do_etest; - union node *next; - struct stackmark smark; - - setstackmark(&smark); - do_etest = 0; - if (n == NULL) { - TRACE(("evaltree(NULL) called\n")); - exitstatus = 0; - goto out; - } - do { - next = NULL; -#ifndef NO_HISTORY - displayhist = 1; /* show history substitutions done with fc */ -#endif - TRACE(("evaltree(%p: %d) called\n", (void *)n, n->type)); - switch (n->type) { - case NSEMI: - evaltree(n->nbinary.ch1, flags & ~EV_EXIT); - if (evalskip) - goto out; - next = n->nbinary.ch2; - break; - case NAND: - evaltree(n->nbinary.ch1, EV_TESTED); - if (evalskip || exitstatus != 0) { - goto out; - } - next = n->nbinary.ch2; - break; - case NOR: - evaltree(n->nbinary.ch1, EV_TESTED); - if (evalskip || exitstatus == 0) - goto out; - next = n->nbinary.ch2; - break; - case NREDIR: - evalredir(n, flags); - break; - case NSUBSHELL: - evalsubshell(n, flags); - do_etest = !(flags & EV_TESTED); - break; - case NBACKGND: - evalsubshell(n, flags); - break; - case NIF: { - evaltree(n->nif.test, EV_TESTED); - if (evalskip) - goto out; - if (exitstatus == 0) - next = n->nif.ifpart; - else if (n->nif.elsepart) - next = n->nif.elsepart; - else - exitstatus = 0; - break; - } - case NWHILE: - case NUNTIL: - evalloop(n, flags & ~EV_EXIT); - break; - case NFOR: - evalfor(n, flags & ~EV_EXIT); - break; - case NCASE: - next = evalcase(n); - break; - case NCLIST: - next = n->nclist.body; - break; - case NCLISTFALLTHRU: - if (n->nclist.body) { - evaltree(n->nclist.body, flags & ~EV_EXIT); - if (evalskip) - goto out; - } - next = n->nclist.next; - break; - case NDEFUN: - defun(n->narg.text, n->narg.next); - exitstatus = 0; - break; - case NNOT: - evaltree(n->nnot.com, EV_TESTED); - if (evalskip) - goto out; - exitstatus = !exitstatus; - break; - - case NPIPE: - evalpipe(n); - do_etest = !(flags & EV_TESTED); - break; - case NCMD: - evalcommand(n, flags, (struct backcmd *)NULL); - do_etest = !(flags & EV_TESTED); - break; - default: - out1fmt("Node type = %d\n", n->type); - flushout(&output); - break; - } - n = next; - popstackmark(&smark); - setstackmark(&smark); - } while (n != NULL); -out: - popstackmark(&smark); - if (pendingsig) - dotrap(); - if (eflag && exitstatus != 0 && do_etest) - exitshell(exitstatus); - if (flags & EV_EXIT) - exraise(EXEXIT); -} - - -static void -evalloop(union node *n, int flags) -{ - int status; - - loopnest++; - status = 0; - for (;;) { - if (!evalskip) - evaltree(n->nbinary.ch1, EV_TESTED); - if (evalskip) { - if (evalskip == SKIPCONT && --skipcount <= 0) { - evalskip = 0; - continue; - } - if (evalskip == SKIPBREAK && --skipcount <= 0) - evalskip = 0; - if (evalskip == SKIPRETURN) - status = exitstatus; - break; - } - if (n->type == NWHILE) { - if (exitstatus != 0) - break; - } else { - if (exitstatus == 0) - break; - } - evaltree(n->nbinary.ch2, flags); - status = exitstatus; - } - loopnest--; - exitstatus = status; -} - - - -static void -evalfor(union node *n, int flags) -{ - struct arglist arglist; - union node *argp; - int i; - int status; - - emptyarglist(&arglist); - for (argp = n->nfor.args ; argp ; argp = argp->narg.next) { - oexitstatus = exitstatus; - expandarg(argp, &arglist, EXP_FULL | EXP_TILDE); - } - - loopnest++; - status = 0; - for (i = 0; i < arglist.count; i++) { - setvar(n->nfor.var, arglist.args[i], 0); - evaltree(n->nfor.body, flags); - status = exitstatus; - if (evalskip) { - if (evalskip == SKIPCONT && --skipcount <= 0) { - evalskip = 0; - continue; - } - if (evalskip == SKIPBREAK && --skipcount <= 0) - evalskip = 0; - break; - } - } - loopnest--; - exitstatus = status; -} - - -/* - * Evaluate a case statement, returning the selected tree. - * - * The exit status needs care to get right. - */ - -static union node * -evalcase(union node *n) -{ - union node *cp; - union node *patp; - struct arglist arglist; - - emptyarglist(&arglist); - oexitstatus = exitstatus; - expandarg(n->ncase.expr, &arglist, EXP_TILDE); - for (cp = n->ncase.cases ; cp ; cp = cp->nclist.next) { - for (patp = cp->nclist.pattern ; patp ; patp = patp->narg.next) { - if (casematch(patp, arglist.args[0])) { - while (cp->nclist.next && - cp->type == NCLISTFALLTHRU && - cp->nclist.body == NULL) - cp = cp->nclist.next; - if (cp->nclist.next && - cp->type == NCLISTFALLTHRU) - return (cp); - if (cp->nclist.body == NULL) - exitstatus = 0; - return (cp->nclist.body); - } - } - } - exitstatus = 0; - return (NULL); -} - - - -/* - * Kick off a subshell to evaluate a tree. - */ - -static void -evalsubshell(union node *n, int flags) -{ - struct job *jp; - int backgnd = (n->type == NBACKGND); - - oexitstatus = exitstatus; - expredir(n->nredir.redirect); - if ((!backgnd && flags & EV_EXIT && !have_traps()) || - forkshell(jp = makejob(n, 1), n, backgnd) == 0) { - if (backgnd) - flags &=~ EV_TESTED; - redirect(n->nredir.redirect, 0); - evaltree(n->nredir.n, flags | EV_EXIT); /* never returns */ - } else if (! backgnd) { - INTOFF; - exitstatus = waitforjob(jp, (int *)NULL); - INTON; - } else - exitstatus = 0; -} - - -/* - * Evaluate a redirected compound command. - */ - -static void -evalredir(union node *n, int flags) -{ - struct jmploc jmploc; - struct jmploc *savehandler; - volatile int in_redirect = 1; - - oexitstatus = exitstatus; - expredir(n->nredir.redirect); - savehandler = handler; - if (setjmp(jmploc.loc)) { - int e; - - handler = savehandler; - e = exception; - popredir(); - if (e == EXERROR || e == EXEXEC) { - if (in_redirect) { - exitstatus = 2; - FORCEINTON; - return; - } - } - longjmp(handler->loc, 1); - } else { - INTOFF; - handler = &jmploc; - redirect(n->nredir.redirect, REDIR_PUSH); - in_redirect = 0; - INTON; - evaltree(n->nredir.n, flags); - } - INTOFF; - handler = savehandler; - popredir(); - INTON; -} - - -static void -exphere(union node *redir, struct arglist *fn) -{ - struct jmploc jmploc; - struct jmploc *savehandler; - struct localvar *savelocalvars; - int need_longjmp = 0; - unsigned char saveoptreset; - - redir->nhere.expdoc = ""; - savelocalvars = localvars; - localvars = NULL; - saveoptreset = shellparam.reset; - forcelocal++; - savehandler = handler; - if (setjmp(jmploc.loc)) - need_longjmp = exception != EXERROR && exception != EXEXEC; - else { - handler = &jmploc; - expandarg(redir->nhere.doc, fn, 0); - redir->nhere.expdoc = fn->args[0]; - INTOFF; - } - handler = savehandler; - forcelocal--; - poplocalvars(); - localvars = savelocalvars; - shellparam.reset = saveoptreset; - if (need_longjmp) - longjmp(handler->loc, 1); - INTON; -} - - -/* - * Compute the names of the files in a redirection list. - */ - -static void -expredir(union node *n) -{ - union node *redir; - - for (redir = n ; redir ; redir = redir->nfile.next) { - struct arglist fn; - emptyarglist(&fn); - switch (redir->type) { - case NFROM: - case NTO: - case NFROMTO: - case NAPPEND: - case NCLOBBER: - expandarg(redir->nfile.fname, &fn, EXP_TILDE); - redir->nfile.expfname = fn.args[0]; - break; - case NFROMFD: - case NTOFD: - if (redir->ndup.vname) { - expandarg(redir->ndup.vname, &fn, EXP_TILDE); - fixredir(redir, fn.args[0], 1); - } - break; - case NXHERE: - exphere(redir, &fn); - break; - } - } -} - - - -/* - * Evaluate a pipeline. All the processes in the pipeline are children - * of the process creating the pipeline. (This differs from some versions - * of the shell, which make the last process in a pipeline the parent - * of all the rest.) - */ - -static void -evalpipe(union node *n) -{ - struct job *jp; - struct nodelist *lp; - int pipelen; - int prevfd; - int pip[2]; - - TRACE(("evalpipe(%p) called\n", (void *)n)); - pipelen = 0; - for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) - pipelen++; - INTOFF; - jp = makejob(n, pipelen); - prevfd = -1; - for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { - prehash(lp->n); - pip[1] = -1; - if (lp->next) { - if (pipe(pip) < 0) { - if (prevfd >= 0) - close(prevfd); - error("Pipe call failed: %s", strerror(errno)); - } - } - if (forkshell(jp, lp->n, n->npipe.backgnd) == 0) { - INTON; - if (prevfd > 0) { - dup2(prevfd, 0); - close(prevfd); - } - if (pip[1] >= 0) { - if (!(prevfd >= 0 && pip[0] == 0)) - close(pip[0]); - if (pip[1] != 1) { - dup2(pip[1], 1); - close(pip[1]); - } - } - evaltree(lp->n, EV_EXIT); - } - if (prevfd >= 0) - close(prevfd); - prevfd = pip[0]; - if (pip[1] != -1) - close(pip[1]); - } - INTON; - if (n->npipe.backgnd == 0) { - INTOFF; - exitstatus = waitforjob(jp, (int *)NULL); - TRACE(("evalpipe: job done exit status %d\n", exitstatus)); - INTON; - } else - exitstatus = 0; -} - - - -static int -is_valid_fast_cmdsubst(union node *n) -{ - - return (n->type == NCMD); -} - -/* - * Execute a command inside back quotes. If it's a builtin command, we - * want to save its output in a block obtained from malloc. Otherwise - * we fork off a subprocess and get the output of the command via a pipe. - * Should be called with interrupts off. - */ - -void -evalbackcmd(union node *n, struct backcmd *result) -{ - int pip[2]; - struct job *jp; - struct stackmark smark; - struct jmploc jmploc; - struct jmploc *savehandler; - struct localvar *savelocalvars; - unsigned char saveoptreset; - - result->fd = -1; - result->buf = NULL; - result->nleft = 0; - result->jp = NULL; - if (n == NULL) { - exitstatus = 0; - return; - } - setstackmark(&smark); - exitstatus = oexitstatus; - if (is_valid_fast_cmdsubst(n)) { - savelocalvars = localvars; - localvars = NULL; - saveoptreset = shellparam.reset; - forcelocal++; - savehandler = handler; - if (setjmp(jmploc.loc)) { - if (exception == EXERROR || exception == EXEXEC) - exitstatus = 2; - else if (exception != 0) { - handler = savehandler; - forcelocal--; - poplocalvars(); - localvars = savelocalvars; - shellparam.reset = saveoptreset; - longjmp(handler->loc, 1); - } - } else { - handler = &jmploc; - evalcommand(n, EV_BACKCMD, result); - } - handler = savehandler; - forcelocal--; - poplocalvars(); - localvars = savelocalvars; - shellparam.reset = saveoptreset; - } else { - if (pipe(pip) < 0) - error("Pipe call failed: %s", strerror(errno)); - jp = makejob(n, 1); - if (forkshell(jp, n, FORK_NOJOB) == 0) { - FORCEINTON; - close(pip[0]); - if (pip[1] != 1) { - dup2(pip[1], 1); - close(pip[1]); - } - evaltree(n, EV_EXIT); - } - close(pip[1]); - result->fd = pip[0]; - result->jp = jp; - } - popstackmark(&smark); - TRACE(("evalbackcmd done: fd=%d buf=%p nleft=%d jp=%p\n", - result->fd, result->buf, result->nleft, result->jp)); -} - -static int -mustexpandto(const char *argtext, const char *mask) -{ - for (;;) { - if (*argtext == CTLQUOTEMARK || *argtext == CTLQUOTEEND) { - argtext++; - continue; - } - if (*argtext == CTLESC) - argtext++; - else if (BASESYNTAX[(int)*argtext] == CCTL) - return (0); - if (*argtext != *mask) - return (0); - if (*argtext == '\0') - return (1); - argtext++; - mask++; - } -} - -static int -isdeclarationcmd(struct narg *arg) -{ - int have_command = 0; - - if (arg == NULL) - return (0); - while (mustexpandto(arg->text, "command")) { - have_command = 1; - arg = &arg->next->narg; - if (arg == NULL) - return (0); - /* - * To also allow "command -p" and "command --" as part of - * a declaration command, add code here. - * We do not do this, as ksh does not do it either and it - * is not required by POSIX. - */ - } - return (mustexpandto(arg->text, "export") || - mustexpandto(arg->text, "readonly") || - (mustexpandto(arg->text, "local") && - (have_command || !isfunc("local")))); -} - -static void -xtracecommand(struct arglist *varlist, int argc, char **argv) -{ - char sep = 0; - const char *text, *p, *ps4; - int i; - - ps4 = expandstr(ps4val()); - out2str(ps4 != NULL ? ps4 : ps4val()); - for (i = 0; i < varlist->count; i++) { - text = varlist->args[i]; - if (sep != 0) - out2c(' '); - p = strchr(text, '='); - if (p != NULL) { - p++; - outbin(text, p - text, out2); - out2qstr(p); - } else - out2qstr(text); - sep = ' '; - } - for (i = 0; i < argc; i++) { - text = argv[i]; - if (sep != 0) - out2c(' '); - out2qstr(text); - sep = ' '; - } - out2c('\n'); - flushout(&errout); -} - -/* - * Check if a builtin can safely be executed in the same process, - * even though it should be in a subshell (command substitution). - * Note that jobid, jobs, times and trap can show information not - * available in a child process; this is deliberate. - * The arguments should already have been expanded. - */ -static int -safe_builtin(int idx, int argc, char **argv) -{ - /* Generated from builtins.def. */ - if (safe_builtin_always(idx)) - return (1); - if (idx == EXPORTCMD || idx == TRAPCMD || idx == ULIMITCMD || - idx == UMASKCMD) - return (argc <= 1 || (argc == 2 && argv[1][0] == '-')); - if (idx == SETCMD) - return (argc <= 1 || (argc == 2 && (argv[1][0] == '-' || - argv[1][0] == '+') && argv[1][1] == 'o' && - argv[1][2] == '\0')); - return (0); -} - -/* - * Execute a simple command. - * Note: This may or may not return if (flags & EV_EXIT). - */ - -static void -evalcommand(union node *cmd, int flags, struct backcmd *backcmd) -{ - union node *argp; - struct arglist arglist; - struct arglist varlist; - char **argv; - int argc; - char **envp; - int varflag; - int mode; - int pip[2]; - struct cmdentry cmdentry; - struct job *jp; - struct jmploc jmploc; - struct jmploc *savehandler; - char *savecmdname; - struct shparam saveparam; - struct localvar *savelocalvars; - struct parsefile *savetopfile; - volatile int e; - char *lastarg; - int signaled; - int do_clearcmdentry; - const char *path = pathval(); - int i; - - /* First expand the arguments. */ - TRACE(("evalcommand(%p, %d) called\n", (void *)cmd, flags)); - emptyarglist(&arglist); - emptyarglist(&varlist); - varflag = 1; - jp = NULL; - do_clearcmdentry = 0; - oexitstatus = exitstatus; - exitstatus = 0; - /* Add one slot at the beginning for tryexec(). */ - appendarglist(&arglist, nullstr); - for (argp = cmd->ncmd.args ; argp ; argp = argp->narg.next) { - if (varflag && isassignment(argp->narg.text)) { - expandarg(argp, varflag == 1 ? &varlist : &arglist, - EXP_VARTILDE); - continue; - } else if (varflag == 1) - varflag = isdeclarationcmd(&argp->narg) ? 2 : 0; - expandarg(argp, &arglist, EXP_FULL | EXP_TILDE); - } - appendarglist(&arglist, nullstr); - expredir(cmd->ncmd.redirect); - argc = arglist.count - 2; - argv = &arglist.args[1]; - - argv[argc] = NULL; - lastarg = NULL; - if (iflag && funcnest == 0 && argc > 0) - lastarg = argv[argc - 1]; - - /* Print the command if xflag is set. */ - if (xflag) - xtracecommand(&varlist, argc, argv); - - /* Now locate the command. */ - if (argc == 0) { - /* Variable assignment(s) without command */ - cmdentry.cmdtype = CMDBUILTIN; - cmdentry.u.index = BLTINCMD; - cmdentry.special = 0; - } else { - static const char PATH[] = "PATH="; - int cmd_flags = 0, bltinonly = 0; - - /* - * Modify the command lookup path, if a PATH= assignment - * is present - */ - for (i = 0; i < varlist.count; i++) - if (strncmp(varlist.args[i], PATH, sizeof(PATH) - 1) == 0) { - path = varlist.args[i] + sizeof(PATH) - 1; - /* - * On `PATH=... command`, we need to make - * sure that the command isn't using the - * non-updated hash table of the outer PATH - * setting and we need to make sure that - * the hash table isn't filled with items - * from the temporary setting. - * - * It would be better to forbit using and - * updating the table while this command - * runs, by the command finding mechanism - * is heavily integrated with hash handling, - * so we just delete the hash before and after - * the command runs. Partly deleting like - * changepatch() does doesn't seem worth the - * bookinging effort, since most such runs add - * directories in front of the new PATH. - */ - clearcmdentry(); - do_clearcmdentry = 1; - } - - for (;;) { - if (bltinonly) { - cmdentry.u.index = find_builtin(*argv, &cmdentry.special); - if (cmdentry.u.index < 0) { - cmdentry.u.index = BLTINCMD; - argv--; - argc++; - break; - } - } else - find_command(argv[0], &cmdentry, cmd_flags, path); - /* implement the bltin and command builtins here */ - if (cmdentry.cmdtype != CMDBUILTIN) - break; - if (cmdentry.u.index == BLTINCMD) { - if (argc == 1) - break; - argv++; - argc--; - bltinonly = 1; - } else if (cmdentry.u.index == COMMANDCMD) { - if (argc == 1) - break; - if (!strcmp(argv[1], "-p")) { - if (argc == 2) - break; - if (argv[2][0] == '-') { - if (strcmp(argv[2], "--")) - break; - if (argc == 3) - break; - argv += 3; - argc -= 3; - } else { - argv += 2; - argc -= 2; - } - path = _PATH_STDPATH; - clearcmdentry(); - do_clearcmdentry = 1; - } else if (!strcmp(argv[1], "--")) { - if (argc == 2) - break; - argv += 2; - argc -= 2; - } else if (argv[1][0] == '-') - break; - else { - argv++; - argc--; - } - cmd_flags |= DO_NOFUNC; - bltinonly = 0; - } else - break; - } - /* - * Special builtins lose their special properties when - * called via 'command'. - */ - if (cmd_flags & DO_NOFUNC) - cmdentry.special = 0; - } - - /* Fork off a child process if necessary. */ - if (((cmdentry.cmdtype == CMDNORMAL || cmdentry.cmdtype == CMDUNKNOWN) - && ((flags & EV_EXIT) == 0 || have_traps())) - || ((flags & EV_BACKCMD) != 0 - && (cmdentry.cmdtype != CMDBUILTIN || - !safe_builtin(cmdentry.u.index, argc, argv)))) { - jp = makejob(cmd, 1); - mode = FORK_FG; - if (flags & EV_BACKCMD) { - mode = FORK_NOJOB; - if (pipe(pip) < 0) - error("Pipe call failed: %s", strerror(errno)); - } - if (cmdentry.cmdtype == CMDNORMAL && - cmd->ncmd.redirect == NULL && - varlist.count == 0 && - (mode == FORK_FG || mode == FORK_NOJOB) && - !disvforkset() && !iflag && !mflag) { - vforkexecshell(jp, argv, environment(), path, - cmdentry.u.index, flags & EV_BACKCMD ? pip : NULL); - goto parent; - } - if (forkshell(jp, cmd, mode) != 0) - goto parent; /* at end of routine */ - if (flags & EV_BACKCMD) { - FORCEINTON; - close(pip[0]); - if (pip[1] != 1) { - dup2(pip[1], 1); - close(pip[1]); - } - flags &= ~EV_BACKCMD; - } - flags |= EV_EXIT; - } - - /* This is the child process if a fork occurred. */ - /* Execute the command. */ - if (cmdentry.cmdtype == CMDFUNCTION) { -#ifdef DEBUG - trputs("Shell function: "); trargs(argv); -#endif - saveparam = shellparam; - shellparam.malloc = 0; - shellparam.reset = 1; - shellparam.nparam = argc - 1; - shellparam.p = argv + 1; - shellparam.optp = NULL; - shellparam.optnext = NULL; - INTOFF; - savelocalvars = localvars; - localvars = NULL; - reffunc(cmdentry.u.func); - savehandler = handler; - if (setjmp(jmploc.loc)) { - popredir(); - unreffunc(cmdentry.u.func); - poplocalvars(); - localvars = savelocalvars; - freeparam(&shellparam); - shellparam = saveparam; - funcnest--; - handler = savehandler; - longjmp(handler->loc, 1); - } - handler = &jmploc; - funcnest++; - redirect(cmd->ncmd.redirect, REDIR_PUSH); - INTON; - for (i = 0; i < varlist.count; i++) - mklocal(varlist.args[i]); - exitstatus = oexitstatus; - evaltree(getfuncnode(cmdentry.u.func), - flags & (EV_TESTED | EV_EXIT)); - INTOFF; - unreffunc(cmdentry.u.func); - poplocalvars(); - localvars = savelocalvars; - freeparam(&shellparam); - shellparam = saveparam; - handler = savehandler; - funcnest--; - popredir(); - INTON; - if (evalskip == SKIPRETURN) { - evalskip = 0; - skipcount = 0; - } - if (jp) - exitshell(exitstatus); - } else if (cmdentry.cmdtype == CMDBUILTIN) { -#ifdef DEBUG - trputs("builtin command: "); trargs(argv); -#endif - mode = (cmdentry.u.index == EXECCMD)? 0 : REDIR_PUSH; - if (flags == EV_BACKCMD) { - memout.nextc = memout.buf; - mode |= REDIR_BACKQ; - } - savecmdname = commandname; - savetopfile = getcurrentfile(); - cmdenviron = &varlist; - e = -1; - savehandler = handler; - if (setjmp(jmploc.loc)) { - e = exception; - if (e == EXINT) - exitstatus = SIGINT+128; - else if (e != EXEXIT) - exitstatus = 2; - goto cmddone; - } - handler = &jmploc; - redirect(cmd->ncmd.redirect, mode); - outclearerror(out1); - /* - * If there is no command word, redirection errors should - * not be fatal but assignment errors should. - */ - if (argc == 0) - cmdentry.special = 1; - listsetvar(cmdenviron, cmdentry.special ? 0 : VNOSET); - if (argc > 0) - bltinsetlocale(); - commandname = argv[0]; - argptr = argv + 1; - nextopt_optptr = NULL; /* initialize nextopt */ - builtin_flags = flags; - exitstatus = (*builtinfunc[cmdentry.u.index])(argc, argv); - flushall(); - if (outiserror(out1)) { - warning("write error on stdout"); - if (exitstatus == 0 || exitstatus == 1) - exitstatus = 2; - } -cmddone: - if (argc > 0) - bltinunsetlocale(); - cmdenviron = NULL; - out1 = &output; - out2 = &errout; - freestdout(); - handler = savehandler; - commandname = savecmdname; - if (jp) - exitshell(exitstatus); - if (flags == EV_BACKCMD) { - backcmd->buf = memout.buf; - backcmd->nleft = memout.buf != NULL ? - memout.nextc - memout.buf : 0; - memout.buf = NULL; - memout.nextc = NULL; - memout.bufend = NULL; - memout.bufsize = 64; - } - if (cmdentry.u.index != EXECCMD) - popredir(); - if (e != -1) { - if ((e != EXERROR && e != EXEXEC) - || cmdentry.special) - exraise(e); - popfilesupto(savetopfile); - if (flags != EV_BACKCMD) - FORCEINTON; - } - } else { -#ifdef DEBUG - trputs("normal command: "); trargs(argv); -#endif - redirect(cmd->ncmd.redirect, 0); - for (i = 0; i < varlist.count; i++) - setvareq(varlist.args[i], VEXPORT|VSTACK); - envp = environment(); - shellexec(argv, envp, path, cmdentry.u.index); - /*NOTREACHED*/ - } - goto out; - -parent: /* parent process gets here (if we forked) */ - if (mode == FORK_FG) { /* argument to fork */ - INTOFF; - exitstatus = waitforjob(jp, &signaled); - INTON; - if (iflag && loopnest > 0 && signaled) { - evalskip = SKIPBREAK; - skipcount = loopnest; - } - } else if (mode == FORK_NOJOB) { - backcmd->fd = pip[0]; - close(pip[1]); - backcmd->jp = jp; - } - -out: - if (lastarg) - setvar("_", lastarg, 0); - if (do_clearcmdentry) - clearcmdentry(); -} - - - -/* - * Search for a command. This is called before we fork so that the - * location of the command will be available in the parent as well as - * the child. The check for "goodname" is an overly conservative - * check that the name will not be subject to expansion. - */ - -static void -prehash(union node *n) -{ - struct cmdentry entry; - - if (n && n->type == NCMD && n->ncmd.args) - if (goodname(n->ncmd.args->narg.text)) - find_command(n->ncmd.args->narg.text, &entry, 0, - pathval()); -} - - - -/* - * Builtin commands. Builtin commands whose functions are closely - * tied to evaluation are implemented here. - */ - -/* - * No command given, a bltin command with no arguments, or a bltin command - * with an invalid name. - */ - -int -bltincmd(int argc, char **argv) -{ - if (argc > 1) { - out2fmt_flush("%s: not found\n", argv[1]); - return 127; - } - /* - * Preserve exitstatus of a previous possible command substitution - * as POSIX mandates - */ - return exitstatus; -} - - -/* - * Handle break and continue commands. Break, continue, and return are - * all handled by setting the evalskip flag. The evaluation routines - * above all check this flag, and if it is set they start skipping - * commands rather than executing them. The variable skipcount is - * the number of loops to break/continue, or the number of function - * levels to return. (The latter is always 1.) It should probably - * be an error to break out of more loops than exist, but it isn't - * in the standard shell so we don't make it one here. - */ - -int -breakcmd(int argc, char **argv) -{ - long n; - char *end; - - if (argc > 1) { - /* Allow arbitrarily large numbers. */ - n = strtol(argv[1], &end, 10); - if (!is_digit(argv[1][0]) || *end != '\0') - error("Illegal number: %s", argv[1]); - } else - n = 1; - if (n > loopnest) - n = loopnest; - if (n > 0) { - evalskip = (**argv == 'c')? SKIPCONT : SKIPBREAK; - skipcount = n; - } - return 0; -} - -/* - * The `command' command. - */ -int -commandcmd(int argc __unused, char **argv __unused) -{ - const char *path; - int ch; - int cmd = -1; - - path = bltinlookup("PATH", 1); - - while ((ch = nextopt("pvV")) != '\0') { - switch (ch) { - case 'p': - path = _PATH_STDPATH; - break; - case 'v': - cmd = TYPECMD_SMALLV; - break; - case 'V': - cmd = TYPECMD_BIGV; - break; - } - } - - if (cmd != -1) { - if (*argptr == NULL || argptr[1] != NULL) - error("wrong number of arguments"); - return typecmd_impl(2, argptr - 1, cmd, path); - } - if (*argptr != NULL) - error("commandcmd bad call"); - - /* - * Do nothing successfully if no command was specified; - * ksh also does this. - */ - return 0; -} - - -/* - * The return command. - */ - -int -returncmd(int argc, char **argv) -{ - int ret = argc > 1 ? number(argv[1]) : oexitstatus; - - evalskip = SKIPRETURN; - skipcount = 1; - return ret; -} - - -int -falsecmd(int argc __unused, char **argv __unused) -{ - return 1; -} - - -int -truecmd(int argc __unused, char **argv __unused) -{ - return 0; -} - - -int -execcmd(int argc, char **argv) -{ - int i; - - /* - * Because we have historically not supported any options, - * only treat "--" specially. - */ - if (argc > 1 && strcmp(argv[1], "--") == 0) - argc--, argv++; - if (argc > 1) { - iflag = 0; /* exit on error */ - mflag = 0; - optschanged(); - for (i = 0; i < cmdenviron->count; i++) - setvareq(cmdenviron->args[i], VEXPORT|VSTACK); - shellexec(argv + 1, environment(), pathval(), 0); - - } - return 0; -} - - -int -timescmd(int argc __unused, char **argv __unused) -{ - struct rusage ru; - long shumins, shsmins, chumins, chsmins; - double shusecs, shssecs, chusecs, chssecs; - - if (getrusage(RUSAGE_SELF, &ru) < 0) - return 1; - shumins = ru.ru_utime.tv_sec / 60; - shusecs = ru.ru_utime.tv_sec % 60 + ru.ru_utime.tv_usec / 1000000.; - shsmins = ru.ru_stime.tv_sec / 60; - shssecs = ru.ru_stime.tv_sec % 60 + ru.ru_stime.tv_usec / 1000000.; - if (getrusage(RUSAGE_CHILDREN, &ru) < 0) - return 1; - chumins = ru.ru_utime.tv_sec / 60; - chusecs = ru.ru_utime.tv_sec % 60 + ru.ru_utime.tv_usec / 1000000.; - chsmins = ru.ru_stime.tv_sec / 60; - chssecs = ru.ru_stime.tv_sec % 60 + ru.ru_stime.tv_usec / 1000000.; - out1fmt("%ldm%.3fs %ldm%.3fs\n%ldm%.3fs %ldm%.3fs\n", shumins, - shusecs, shsmins, shssecs, chumins, chusecs, chsmins, chssecs); - return 0; -} |