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Explore comfort level with posix_spawn

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Justine says nay for the time being. Only XNU implements this. It's not
clear what ABI XNU is using but it's obviously not the one in the POSIX
documentation link below. Since all platforms implement vfork, it might
be better to empirically gauge the intersection of consensus which will
have better performance than this interface.

https://pubs.opengroup.org/onlinepubs/009696699/xrat/xsh_chap03.html
This commit is contained in:
Justine Tunney
2021-01-29 00:10:06 -08:00
parent b2260c2278
commit f7c7b949fd
13 changed files with 30 additions and 56 deletions
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12
libc/sysv/consts.sh
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@ -280,18 +280,6 @@ syscon madv MADV_HWPOISON 100 0 0 0 0 # TODO(jart): what is it?
syscon madv MADV_REMOVE 9 0 0 0 0 # TODO(jart): what is it?
syscon fadv POSIX_FADV_NOREUSE 5 0 5 0 0 # wut
# posix_spawn()
# only native on xnu
#
# group name GNU/Systemd XNU's Not UNIX FreeBSD OpenBSD XENIX Commentary
syscon spawn POSIX_SPAWN_RESETIDS 1 1 1 1 0 # unix consensus
syscon spawn POSIX_SPAWN_SETPGROUP 2 2 2 2 0 # unix consensus
syscon spawn POSIX_SPAWN_SETSIGDEF 4 4 0x10 0x10 0
syscon spawn POSIX_SPAWN_SETSIGMASK 8 8 0x20 0x20 0
syscon spawn POSIX_SPAWN_SETSCHEDPARAM 0x10 0 4 4 0
syscon spawn POSIX_SPAWN_SETSCHEDULER 0x20 0 8 8 0
syscon spawn POSIX_SPAWN_USEVFORK 0x40 0 0 0 0
# mmap(), mprotect(), etc.
# digital restrictions management for the people
#