path: root/main/musl/0010-make-posix_spawn-and-functions-that-use-it-use-CLONE.patch
diff options
Diffstat (limited to 'main/musl/0010-make-posix_spawn-and-functions-that-use-it-use-CLONE.patch')
1 files changed, 0 insertions, 50 deletions
diff --git a/main/musl/0010-make-posix_spawn-and-functions-that-use-it-use-CLONE.patch b/main/musl/0010-make-posix_spawn-and-functions-that-use-it-use-CLONE.patch
deleted file mode 100644
index d6260a5f9d..0000000000
--- a/main/musl/0010-make-posix_spawn-and-functions-that-use-it-use-CLONE.patch
+++ /dev/null
@@ -1,50 +0,0 @@
-From 53761b469221fbe062629c50249e3d534573eda9 Mon Sep 17 00:00:00 2001
-From: Rich Felker <dalias@aerifal.cx>
-Date: Wed, 17 Jul 2013 13:54:41 -0400
-Subject: [PATCH 10/10] make posix_spawn (and functions that use it) use
-this is both a minor scheduling optimization and a workaround for a
-difficult-to-fix bug in qemu app-level emulation.
-from the scheduling standpoint, it makes no sense to schedule the
-parent thread again until the child has exec'd or exited, since the
-parent will immediately block again waiting for it.
-on the qemu side, as regular application code running on an underlying
-libc, qemu cannot make arbitrary clone syscalls itself without
-confusing the underlying implementation. instead, it breaks them down
-into either fork-like or pthread_create-like cases. it was treating
-the code in posix_spawn as pthread_create-like, due to CLONE_VM, which
-caused horribly wrong behavior: CLONE_FILES broke the synchronization
-mechanism, CLONE_SIGHAND broke the parent's signals, and CLONE_THREAD
-caused the child's exec to end the parent -- if it hadn't already
-crashed. however, qemu special-cases CLONE_VFORK and emulates that
-with fork, even when CLONE_VM is also specified. this also gives
-incorrect semantics for code that really needs the memory sharing, but
-posix_spawn does not make use of the vm sharing except to avoid
-momentary double commit charge.
-programs using posix_spawn (including via popen) should now work
-correctly under qemu app-level emulation.
- src/process/posix_spawn.c | 3 ++-
- 1 file changed, 2 insertions(+), 1 deletion(-)
-diff --git a/src/process/posix_spawn.c b/src/process/posix_spawn.c
-index e6a031c..68cf795 100644
---- a/src/process/posix_spawn.c
-+++ b/src/process/posix_spawn.c
-@@ -138,7 +138,8 @@ int __posix_spawnx(pid_t *restrict res, const char *restrict path,
- args.envp = envp;
- pthread_sigmask(SIG_BLOCK, SIGALL_SET, &args.oldmask);
-- pid = __clone(child, stack+sizeof stack, CLONE_VM|SIGCHLD, &args);
-+ pid = __clone(child, stack+sizeof stack,
- close(args.p[1]);
- if (pid > 0) {