mirrors/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-12-23 09:19:18 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

bpo-47151: Fallback to fork when vfork fails in subprocess. (GH-32186)

Browse source 
bpo-47151: Fallback to fork when vfork fails in subprocess. An OS kernel can specifically decide to disallow vfork() in a process. No need for that to prevent us from launching subprocesses.
(cherry picked from commit 4a08c4c469)

Co-authored-by: Gregory P. Smith <greg@krypto.org>
This commit is contained in:
Miss Islington (bot) 2022-03-31 14:09:50 -07:00 • committed by GitHub
parent 625f6704c0
commit 9ed179b07d
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
2 changed files with 9 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

3
Misc/NEWS.d/next/Library/2022-03-30-01-17-43.bpo-47151.z-nQkR.rst Normal file
View file

@ -0,0 +1,3 @@
When subprocess tries to use vfork, it now falls back to fork if vfork
returns an error. This allows use in situations where vfork isn't allowed
by the OS kernel.

6
Modules/_posixsubprocess.c
View file

@ -681,6 +681,12 @@ do_fork_exec(char *const exec_array[],
assert(preexec_fn == Py_None);
pid = vfork();
if (pid == -1) {
/* If vfork() fails, fall back to using fork(). When it isn't
* allowed in a process by the kernel, vfork can return -1
* with errno EINVAL. https://bugs.python.org/issue47151. */
pid = fork();
}
} else
#endif
{