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/* -----------------------------------------------------------------------------
(c) The University of Glasgow 1995-2004
Our low-level exec() variant.
Note: __hsunix_execvpe() is very similiar to the function
execvpe(3) as provided by glibc 2.11 and later. However, if
execvpe(3) is available, we use that instead.
-------------------------------------------------------------------------- */
#include "HsUnixConfig.h"
#include <errno.h>
#include <sys/types.h>
#if HAVE_SYS_WAIT_H
# include <sys/wait.h>
#endif
#include <unistd.h>
#include <sys/time.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#define HSUNIX_EXECVPE_H_NO_COMPAT
#include "execvpe.h"
#if !defined(execvpe) && !HAVE_DECL_EXECVPE
// On some archs such as AIX, the prototype may be missing
int execvpe(const char *file, char *const argv[], char *const envp[]);
#endif
/*
* We want the search semantics of execvp, but we want to provide our
* own environment, like execve. The following copyright applies to
* this code, as it is a derivative of execvp:
*-
* Copyright (c) 1991 The Regents of the University of California.
* All rights reserved.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
int
__hsunix_execvpe(const char *name, char *const argv[], char *const envp[])
{
#if HAVE_EXECVPE
return execvpe(name, argv, envp);
#else
register int lp, ln;
register char *p;
int eacces=0, etxtbsy=0;
char *bp, *cur, *path, *buf = 0;
/* If it's an absolute or relative path name, it's easy. */
if (strchr(name, '/')) {
bp = (char *) name;
cur = path = buf = NULL;
goto retry;
}
/* Get the path we're searching. */
if (!(path = getenv("PATH"))) {
# ifdef HAVE_CONFSTR
ln = confstr(_CS_PATH, NULL, 0);
if ((cur = path = malloc(ln + 1)) != NULL) {
path[0] = ':';
(void) confstr (_CS_PATH, path + 1, ln);
}
# else
if ((cur = path = malloc(1 + 1)) != NULL) {
path[0] = ':';
path[1] = '\0';
}
# endif
} else
cur = path = strdup(path);
if (path == NULL || (bp = buf = malloc(strlen(path)+strlen(name)+2)) == NULL)
goto done;
while (cur != NULL) {
p = cur;
if ((cur = strchr(cur, ':')) != NULL)
*cur++ = '\0';
/*
* It's a SHELL path -- double, leading and trailing colons mean the current
* directory.
*/
if (!*p) {
p = ".";
lp = 1;
} else
lp = strlen(p);
ln = strlen(name);
memcpy(buf, p, lp);
buf[lp] = '/';
memcpy(buf + lp + 1, name, ln);
buf[lp + ln + 1] = '\0';
retry:
(void) execve(bp, argv, envp);
switch (errno) {
case EACCES:
eacces = 1;
break;
case ENOTDIR:
case ENOENT:
break;
case ENOEXEC:
{
register size_t cnt;
register char **ap;
for (cnt = 0, ap = (char **) argv; *ap; ++ap, ++cnt)
;
if ((ap = malloc((cnt + 2) * sizeof(char *))) != NULL) {
memcpy(ap + 2, argv + 1, cnt * sizeof(char *));
ap[0] = "sh";
ap[1] = bp;
(void) execve("/bin/sh", ap, envp);
free(ap);
}
goto done;
}
case ETXTBSY:
if (etxtbsy < 3)
(void) sleep(++etxtbsy);
goto retry;
default:
goto done;
}
}
if (eacces)
errno = EACCES;
else if (!errno)
errno = ENOENT;
done:
if (path)
free(path);
if (buf)
free(buf);
return (-1);
#endif
}
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