mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-23 03:10:05 +00:00
113 lines
3.0 KiB
C
113 lines
3.0 KiB
C
/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public License as
|
|
published by the Free Software Foundation; either version 2 of the
|
|
License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If
|
|
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
|
|
Cambridge, MA 02139, USA. */
|
|
|
|
#include <ansidecl.h>
|
|
#include <unistd.h>
|
|
#include <stdarg.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <sys/stat.h>
|
|
#include <limits.h>
|
|
#include <sys/types.h>
|
|
|
|
#ifndef HAVE_GNU_LD
|
|
#define __environ environ
|
|
#endif
|
|
|
|
/* Execute FILE, searching in the `PATH' environment variable if it contains
|
|
no slashes, with arguments ARGV and environment from `environ'. */
|
|
int
|
|
DEFUN(execvp, (file, argv), CONST char *file AND char *CONST argv[])
|
|
{
|
|
if (strchr (file, '/') == NULL)
|
|
{
|
|
char *path, *p;
|
|
struct stat st;
|
|
size_t len;
|
|
uid_t uid;
|
|
gid_t gid;
|
|
int ngroups;
|
|
gid_t groups[NGROUPS_MAX];
|
|
char *name;
|
|
|
|
path = getenv ("PATH");
|
|
if (path == NULL)
|
|
{
|
|
/* There is no `PATH' in the environment.
|
|
The default search path is the current directory
|
|
followed by the path `confstr' returns for `_CS_PATH'. */
|
|
len = confstr (_CS_PATH, (char *) NULL, 0);
|
|
path = (char *) __alloca (1 + len);
|
|
path[0] = ':';
|
|
(void) confstr (_CS_PATH, path + 1, len);
|
|
}
|
|
|
|
len = strlen (file) + 1;
|
|
name = __alloca (strlen (path) + len);
|
|
uid = geteuid ();
|
|
gid = getegid ();
|
|
ngroups = getgroups (sizeof (groups) / sizeof (groups[0]), groups);
|
|
p = path;
|
|
do
|
|
{
|
|
path = p;
|
|
p = strchr (path, ':');
|
|
if (p == NULL)
|
|
p = strchr (path, '\0');
|
|
|
|
if (p == path)
|
|
/* Two adjacent colons, or a colon at the beginning or the end
|
|
of `PATH' means to search the current directory. */
|
|
(void) memcpy (name, file, len);
|
|
else
|
|
{
|
|
/* Construct the pathname to try. */
|
|
(void) memcpy (name, path, p - path);
|
|
name[p - path] = '/';
|
|
(void) memcpy (&name[(p - path) + 1], file, len);
|
|
}
|
|
if (stat (name, &st) == 0 && S_ISREG (st.st_mode))
|
|
{
|
|
int bit = S_IXOTH;
|
|
if (st.st_uid == uid)
|
|
bit = S_IXUSR;
|
|
else if (st.st_gid == gid)
|
|
bit = S_IXGRP;
|
|
else
|
|
{
|
|
register int i;
|
|
for (i = 0; i < ngroups; ++i)
|
|
if (st.st_gid == groups[i])
|
|
{
|
|
bit = S_IXGRP;
|
|
break;
|
|
}
|
|
}
|
|
if (st.st_mode & bit)
|
|
{
|
|
file = name;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
while (*p++ != '\0');
|
|
}
|
|
|
|
return __execve (file, argv, __environ);
|
|
}
|