glibc/sysdeps/unix
Rasmus Villemoes 4b4d4056bb linux: spawni.c: simplify error reporting to parent
Using CLONE_VFORK already ensures that the parent does not run until the
child has either exec'ed succesfully or called _exit. Hence we don't
need to read from a CLOEXEC pipe to ensure proper synchronization - we
just make explicit use of the fact the the child and parent run in the
same VM, so the child can write an error code to a field of the
posix_spawn_args struct instead of sending it through a pipe.

To ensure that this mechanism really works, the parent initializes the
field to -1 and the child writes 0 before execing.

This eliminates some annoying bookkeeping that is necessary to avoid
the file actions from clobbering the write end of the pipe, and
getting rid of the pipe creation in the first place means fewer system
calls (four in the parent, usually one in the child) and fewer
chanches for the spawn to fail (e.g. if we're close to EMFILE).

Checked on x86_64 and i686.

	* sysdeps/unix/sysv/linux/spawni.c (posix_spawn_args): Remove pipe
	field, add err field.
	(__spawni_child): Report error through err member instead of pipe.
	(__spawnix): Likewise.
2016-09-28 11:16:21 -07:00
..
alpha Do not override objects in libc.a in other static libraries [BZ #20452] 2016-08-17 14:57:01 +02:00
arm Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
bsd Make padding in struct sockaddr_storage explicit [BZ #20111] 2016-05-23 19:43:09 +02:00
i386 Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
inet Move nss directory into sysdeps Subdirs. 2013-02-05 14:32:48 -08:00
mips Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
powerpc Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sh Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sysv/linux linux: spawni.c: simplify error reporting to parent 2016-09-28 11:16:21 -07:00
x86_64 Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
clock_gettime.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
clock_nanosleep.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
clock_settime.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
confstr.h
get_child_max.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
getlogin_r.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
getlogin.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
getpagesize.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
grantpt.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
ifreq.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
Implies
make-syscalls.sh Make shebang interpreter directives consistent 2016-01-07 04:03:21 -05:00
Makefile Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
s-proto-cancel.S
s-proto.S
setxid.h
sockatmark.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
stime.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
syscall-template.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
syscall.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
syscalls.list Fix nice getpriority, setpriority namespace (bug 18553). 2015-06-17 20:22:39 +00:00
sysdep.h Add INTERNAL_SYSCALL_CALL 2016-09-26 08:47:13 -07:00