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90 lines
2.8 KiB
C
90 lines
2.8 KiB
C
/* Copyright (C) 1991, 1992, 1995 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <unistd.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <string.h>
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/* Execute FILE, searching in the `PATH' environment variable if it contains
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no slashes, with arguments ARGV and environment from `environ'. */
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int
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execvp (file, argv)
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const char *file;
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char *const argv[];
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{
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if (strchr (file, '/') != NULL)
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/* Don't search when it contains a slash. */
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return execv (file, argv);
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else
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{
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char *path, *p, *name;
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size_t len;
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path = getenv ("PATH");
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if (path == NULL)
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{
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/* There is no `PATH' in the environment.
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The default search path is the current directory
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followed by the path `confstr' returns for `_CS_PATH'. */
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len = confstr (_CS_PATH, (char *) NULL, 0);
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path = (char *) __alloca (1 + len);
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path[0] = ':';
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(void) confstr (_CS_PATH, path + 1, len);
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}
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len = strlen (file) + 1;
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name = __alloca (strlen (path) + len);
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p = path;
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do
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{
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path = p;
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p = strchr (path, ':');
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if (p == NULL)
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p = strchr (path, '\0');
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if (p == path)
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/* Two adjacent colons, or a colon at the beginning or the end
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of `PATH' means to search the current directory. */
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(void) memcpy (name, file, len);
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else
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{
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/* Construct the pathname to try. */
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(void) memcpy (name, path, p - path);
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name[p - path] = '/';
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(void) memcpy (&name[(p - path) + 1], file, len);
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}
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/* Try to execute this name. If it works, execv will not return. */
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execv (name, argv);
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if (errno != ENOENT && errno != EACCES)
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/* Those errors indicate the file is missing or not executable
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by us, in which case we want to just try the next path
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directory. Some other error means we found an executable
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file, but something went wrong executing it; return the
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error to our caller. */
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return -1;
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}
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while (*p++ != '\0');
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}
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/* We tried every element and none of them worked.
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Return the error from the last attempt (probably ENOENT). */
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return -1;
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}
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