diff options
Diffstat (limited to 'posix/execl.c')
| -rw-r--r-- | posix/execl.c | 53 |
1 files changed, 24 insertions, 29 deletions
diff --git a/posix/execl.c b/posix/execl.c index 62fd45db58..7f822d0142 100644 --- a/posix/execl.c +++ b/posix/execl.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1991,92,94,97,98,99,2002 Free Software Foundation, Inc. +/* Copyright (C) 1991,92,94,97,98,99,2002,2005 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 @@ -16,63 +16,58 @@ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ -#include <alloca.h> #include <unistd.h> #include <stdarg.h> #include <stddef.h> +#include <stdlib.h> #include <string.h> #include <stackinfo.h> -#ifndef HAVE_GNU_LD -# define __environ environ -#endif /* Execute PATH with all arguments after PATH until a NULL pointer and environment from `environ'. */ int execl (const char *path, const char *arg, ...) { - size_t argv_max = 1024; - const char **argv = alloca (argv_max * sizeof (const char *)); - unsigned int i; +#define INITIAL_ARGV_MAX 1024 + size_t argv_max = INITIAL_ARGV_MAX; + const char *initial_argv[INITIAL_ARGV_MAX]; + const char **argv = initial_argv; va_list args; argv[0] = arg; va_start (args, arg); - i = 0; + unsigned int i = 0; while (argv[i++] != NULL) { if (i == argv_max) { - const char **nptr = alloca ((argv_max *= 2) * sizeof (const char *)); - -#ifndef _STACK_GROWS_UP - if ((char *) nptr + argv_max == (char *) argv) + argv_max *= 2; + const char **nptr = realloc (argv == initial_argv ? NULL : argv, + argv_max * sizeof (const char *)); + if (nptr == NULL) { - /* Stack grows down. */ - argv = (const char **) memcpy (nptr, argv, - i * sizeof (const char *)); - argv_max += i; + if (argv != initial_argv) + free (argv); + return -1; } - else -#endif -#ifndef _STACK_GROWS_DOWN - if ((char *) argv + i == (char *) nptr) - /* Stack grows up. */ - argv_max += i; - else -#endif - /* We have a hole in the stack. */ - argv = (const char **) memcpy (nptr, argv, - i * sizeof (const char *)); + if (argv == initial_argv) + /* We have to copy the already filled-in data ourselves. */ + memcpy (nptr, argv, i * sizeof (const char *)); + + argv = nptr; } argv[i] = va_arg (args, const char *); } va_end (args); - return __execve (path, (char *const *) argv, __environ); + int ret = __execve (path, (char *const *) argv, __environ); + if (argv != initial_argv) + free (argv); + + return ret; } libc_hidden_def (execl) |