mirror of
git://sourceware.org/git/glibc.git
synced 2024-11-21 01:12:26 +08:00
90 lines
2.8 KiB
C
90 lines
2.8 KiB
C
/* Copyright (C) 1991, 1992, 1995 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 <unistd.h>
|
|
#include <stdarg.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
/* Execute FILE, searching in the `PATH' environment variable if it contains
|
|
no slashes, with arguments ARGV and environment from `environ'. */
|
|
int
|
|
execvp (file, argv)
|
|
const char *file;
|
|
char *const argv[];
|
|
{
|
|
if (strchr (file, '/') != NULL)
|
|
/* Don't search when it contains a slash. */
|
|
return execv (file, argv);
|
|
else
|
|
{
|
|
char *path, *p, *name;
|
|
size_t len;
|
|
|
|
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);
|
|
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);
|
|
}
|
|
|
|
/* Try to execute this name. If it works, execv will not return. */
|
|
execv (name, argv);
|
|
if (errno != ENOENT && errno != EACCES)
|
|
/* Those errors indicate the file is missing or not executable
|
|
by us, in which case we want to just try the next path
|
|
directory. Some other error means we found an executable
|
|
file, but something went wrong executing it; return the
|
|
error to our caller. */
|
|
return -1;
|
|
}
|
|
while (*p++ != '\0');
|
|
}
|
|
|
|
/* We tried every element and none of them worked.
|
|
Return the error from the last attempt (probably ENOENT). */
|
|
return -1;
|
|
}
|