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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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2
libc/sysv/syscalls.sh
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@ -91,7 +91,7 @@ scall 'setsockopt$sysv' 0x0069006920690036 globl hidden
scall 'getsockopt$sysv' 0x0076007620760037 globl hidden
scall '__fork$sysv' 0x0002000220020039 globl hidden # xnu needs eax=~-edx b/c eax always holds pid and edx is 0 for parent and 1 for child
#scall vfork 0x004200422042003a globl # this syscall is from the moon so we implement it by hand in libc/calls/hefty/vfork.S
scall posix_spawn 0xffffffff20f4ffff globl hidden # TODO: put in spawnve()
scall 'posix_spawn$sysv' 0xffffffff20f4ffff globl hidden # good luck figuring out how xnu defines this
scall '__execve$sysv' 0x003b003b203b003b globl hidden
scall 'wait4$sysv' 0x000b00072007003d globl hidden
scall 'kill$sysv' 0x007a00252025003e globl hidden # kill(pid, sig, 1) b/c xnu