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author | Alexandra Hájková <alexandra.khirnova@gmail.com> | 2021-05-03 16:35:10 +0000 |
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committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2021-05-03 16:46:06 -0300 |
commit | 19d83270fcd993cc349570164e21b06d57036704 (patch) | |
tree | 3b792ec90a694a69046fe4858d5f408fcb9e41ff /sysdeps/unix/sysv/linux/execveat.c | |
parent | 1427d28e3008e2d2d467883a14a24df6a40b82b1 (diff) | |
download | glibc-19d83270fcd993cc349570164e21b06d57036704.tar.gz glibc-19d83270fcd993cc349570164e21b06d57036704.tar.xz glibc-19d83270fcd993cc349570164e21b06d57036704.zip |
linux: Add execveat system call wrapper
It operates similar to execve and it is is already used to implement fexecve without requiring /proc to be mounted. However, different than fexecve, if the syscall is not supported by the kernel an error is returned instead of trying a fallback. Checked on x86_64-linux-gnu and powerpc64le-linux-gnu. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Diffstat (limited to 'sysdeps/unix/sysv/linux/execveat.c')
-rw-r--r-- | sysdeps/unix/sysv/linux/execveat.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/execveat.c b/sysdeps/unix/sysv/linux/execveat.c new file mode 100644 index 0000000000..29ab81a464 --- /dev/null +++ b/sysdeps/unix/sysv/linux/execveat.c @@ -0,0 +1,32 @@ +/* Execute program relative to a directory file descriptor. + Copyright (C) 2021 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 + <https://www.gnu.org/licenses/>. */ + +#include <fd_to_filename.h> +#include <sysdep.h> +#include <unistd.h> + +/* Execute the file FD refers to, overlaying the running program image. + ARGV and ENVP are passed to the new program, as for 'execve'. */ +int +execveat (int dirfd, const char *path, char *const argv[], char *const envp[], + int flags) +{ + /* Avoid implicit array coercion in syscall macros. */ + return INLINE_SYSCALL_CALL (execveat, dirfd, path, &argv[0], &envp[0], + flags); +} |