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Use posix_spawn on musl targets 

The posix_spawn had been available in a form suitable for use in a
Command implementation since musl 0.9.12. Use it in a preference to a
fork when possible, to benefit from CLONE_VM|CLONE_VFORK used there.
This commit is contained in:
Tomasz Miąsko 2020-10-01 00:00:00 +00:00
parent 2ad6187ce5
commit 9845e7d5fb
1 changed files with 8 additions and 6 deletions
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14
library/std/src/sys/unix/process/process_unix.rs
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@ -252,7 +252,8 @@ impl Command {
#[cfg(not(any(
target_os = "macos",
target_os = "freebsd",
all(target_os = "linux", target_env = "gnu")
all(target_os = "linux", target_env = "gnu"),
all(target_os = "linux", target_env = "musl"),
)))]
fn posix_spawn(
&mut self,
@ -267,7 +268,8 @@ impl Command {
#[cfg(any(
target_os = "macos",
target_os = "freebsd",
all(target_os = "linux", target_env = "gnu")
all(target_os = "linux", target_env = "gnu"),
all(target_os = "linux", target_env = "musl"),
))]
fn posix_spawn(
&mut self,
@ -297,10 +299,10 @@ impl Command {
}
}
// Solaris and glibc 2.29+ can set a new working directory, and maybe
// others will gain this non-POSIX function too. We'll check for this
// weak symbol as soon as it's needed, so we can return early otherwise
// to do a manual chdir before exec.
// Solaris, glibc 2.29+, and musl 1.24+ can set a new working directory,
// and maybe others will gain this non-POSIX function too. We'll check
// for this weak symbol as soon as it's needed, so we can return early
// otherwise to do a manual chdir before exec.
weak! {
fn posix_spawn_file_actions_addchdir_np(
*mut libc::posix_spawn_file_actions_t,