244 lines
6.2 KiB
C
244 lines
6.2 KiB
C
/*-
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* Copyright (c) 1991 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)exec.c 5.9 (Berkeley) 6/17/91";
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#endif /* LIBC_SCCS and not lint */
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#define _KERNEL
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#include "ixemul.h"
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#include "kprintf.h"
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#include <errno.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <paths.h>
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#ifdef __STDC__
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#include <stdarg.h>
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#else
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#include <varargs.h>
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#endif
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static char **
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buildargv(ap, arg, envpp)
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va_list ap;
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const char *arg;
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char ***envpp;
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{
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register size_t max, off;
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register char **argv = NULL;
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for (off = max = 0;; ++off) {
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if (off >= max) {
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max += 50; /* Starts out at 0. */
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max *= 2; /* Ramp up fast. */
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if (!(argv = realloc(argv, max * sizeof(char *))))
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return(NULL);
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if (off == 0) {
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argv[0] = (char *)arg;
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off = 1;
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}
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}
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if (!(argv[off] = va_arg(ap, char *)))
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break;
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}
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/* Get environment pointer if user supposed to provide one. */
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if (envpp)
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*envpp = va_arg(ap, char **);
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return(argv);
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}
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int execl(const char *name, const char *arg, ...)
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{
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usetup;
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va_list ap;
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int sverrno;
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char **argv;
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va_start(ap, arg);
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if ((argv = buildargv(ap, arg, (char ***)NULL)))
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(void)execve(name, argv, *u.u_environ);
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va_end(ap);
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sverrno = errno;
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free(argv);
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errno = sverrno;
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KPRINTF (("&errno = %lx, errno = %ld\n", &errno, errno));
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return(-1);
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}
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int execle(const char *name, const char *arg, ...)
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{
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usetup;
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va_list ap;
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int sverrno;
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char **argv, **envp;
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va_start(ap, arg);
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if ((argv = buildargv(ap, arg, &envp)))
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(void)execve(name, argv, envp);
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va_end(ap);
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sverrno = errno;
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free(argv);
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errno = sverrno;
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KPRINTF (("&errno = %lx, errno = %ld\n", &errno, errno));
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return(-1);
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}
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int execlp(const char *name, const char *arg, ...)
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{
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usetup;
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va_list ap;
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int sverrno;
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char **argv;
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va_start(ap, arg);
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if ((argv = buildargv(ap, arg, (char ***)NULL)))
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(void)execvp(name, argv);
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va_end(ap);
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sverrno = errno;
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free(argv);
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errno = sverrno;
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KPRINTF (("&errno = %lx, errno = %ld\n", &errno, errno));
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return(-1);
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}
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int execv(const char *name, char * const *argv)
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{
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usetup;
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execve(name, argv, *u.u_environ);
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return(-1);
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}
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int execvp(const char *name, char * const *argv)
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{
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usetup;
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register int lp, ln;
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register char *p;
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int eacces, etxtbsy;
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char *bp, *cur, *path, buf[MAXPATHLEN];
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eacces = etxtbsy = 0;
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/* If it's an absolute or relative path name, it's easy. */
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if (index(name, '/') || index (name, ':')) {
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bp = (char *)name;
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cur = path = NULL;
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goto retry;
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}
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bp = buf;
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/* first try to call execve() without path lookup. execve() walks
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a (possibly provided) CLI PATH, and also supports resident
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programs. If this fails, we can still try to find the program
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along the $PATH */
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execv (name, argv);
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/* if we get here, the execv() failed. So start magic ;-)) */
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/* only continue if execv didn't find the program. */
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if (errno != ENOENT)
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return -1;
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/* Get the path we're searching. */
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if (!(path = getenv("PATH")))
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path = _PATH_DEFPATH;
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cur = path = strdup(path);
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while ((p = strsep(&cur, ",:"))) {
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/*
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* It's a SHELL path -- double, leading and trailing colons
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* mean the current directory.
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*/
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if (!*p) {
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p = ".";
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lp = 1;
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} else
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lp = strlen(p);
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ln = strlen(name);
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/*
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* If the path is too long complain. This is a possible
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* security issue; given a way to make the path too long
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* the user may execute the wrong program.
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*/
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if (lp + ln + 2 > sizeof(buf)) {
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syscall(SYS_write, STDERR_FILENO, "execvp: ", 8);
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syscall(SYS_write, STDERR_FILENO, p, lp);
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syscall(SYS_write, STDERR_FILENO, ": path too long\n", 16);
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continue;
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}
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bcopy(p, buf, lp);
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buf[lp] = '/';
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bcopy(name, buf + lp + 1, ln);
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buf[lp + ln + 1] = '\0';
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retry: execve(bp, argv, *u.u_environ);
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switch(errno) {
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case EACCES:
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eacces = 1;
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break;
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case ENOENT:
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break;
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case ENOEXEC: {
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register size_t cnt;
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register char **ap;
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for (cnt = 0, ap = (char **)argv; *ap; ++ap, ++cnt);
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if ((ap = malloc((cnt + 2) * sizeof(char *)))) {
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bcopy(argv + 1, ap + 2, cnt * sizeof(char *));
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ap[0] = "sh";
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ap[1] = bp;
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execve(_PATH_BSHELL, ap, *u.u_environ);
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free(ap);
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}
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goto done;
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}
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case ETXTBSY:
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if (etxtbsy < 3)
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sleep(++etxtbsy);
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goto retry;
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default:
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goto done;
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}
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}
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if (eacces)
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errno = EACCES;
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else if (!errno)
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errno = ENOENT;
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KPRINTF (("&errno = %lx, errno = %ld\n", &errno, errno));
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done: if (path)
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free(path);
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return(-1);
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}
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