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Diffstat (limited to 'REORG.TODO/posix/execle.c')
-rw-r--r-- | REORG.TODO/posix/execle.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/REORG.TODO/posix/execle.c b/REORG.TODO/posix/execle.c new file mode 100644 index 0000000000..bb2c4a0cf2 --- /dev/null +++ b/REORG.TODO/posix/execle.c @@ -0,0 +1,59 @@ +/* Copyright (C) 1991-2017 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 Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <unistd.h> +#include <stdarg.h> +#include <errno.h> +#include <sys/param.h> + +/* Execute PATH with all arguments after PATH until a NULL pointer, + and the argument after that for environment. */ +int +execle (const char *path, const char *arg, ...) +{ + ptrdiff_t argc; + va_list ap; + va_start (ap, arg); + for (argc = 1; va_arg (ap, const char *); argc++) + { + if (argc == INT_MAX) + { + va_end (ap); + errno = E2BIG; + return -1; + } + } + va_end (ap); + + /* Avoid dynamic memory allocation due two main issues: + 1. The function should be async-signal-safe and a running on a signal + handler with a fail outcome might lead to malloc bad state. + 2. It might be used in a vfork/clone(VFORK) scenario where using + malloc also might lead to internal bad state. */ + ptrdiff_t i; + char *argv[argc + 1]; + char **envp; + va_start (ap, arg); + argv[0] = (char *) arg; + for (i = 1; i <= argc; i++) + argv[i] = va_arg (ap, char *); + envp = va_arg (ap, char **); + va_end (ap); + + return __execve (path, argv, envp); +} +libc_hidden_def (execle) |