linux add POSIX_SPAWN_USEVFORK (mostly no-op now) extension.

closes #2269
rust-lang · Nov 6, 2021 · 7877856 · 7877856
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diff --git a/libc-test/semver/linux.txt b/libc-test/semver/linux.txt
@@ -1529,6 +1529,7 @@ POSIX_SPAWN_SETSCHEDPARAM
 POSIX_SPAWN_SETSCHEDULER
 POSIX_SPAWN_SETSIGDEF
 POSIX_SPAWN_SETSIGMASK
+POSIX_SPAWN_USEVFORK
 PROT_GROWSDOWN
 PROT_GROWSUP
 PR_CAPBSET_DROP

diff --git a/src/unix/linux_like/linux/mod.rs b/src/unix/linux_like/linux/mod.rs
@@ -1330,6 +1330,7 @@ pub const POSIX_MADV_NORMAL: ::c_int = 0;
 pub const POSIX_MADV_RANDOM: ::c_int = 1;
 pub const POSIX_MADV_SEQUENTIAL: ::c_int = 2;
 pub const POSIX_MADV_WILLNEED: ::c_int = 3;
+pub const POSIX_SPAWN_USEVFORK: ::c_int = 64;
 
 pub const S_IEXEC: mode_t = 64;
 pub const S_IWRITE: mode_t = 128;