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libthread: reduce stack usage for ioprocs, open /proc/n/ctl with OCEXEC flag

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This commit is contained in:
cinap_lenrek 2020-12-07 14:29:45 +01:00
parent 1e2657ee97
commit e45bd6814a
1 changed files with 10 additions and 5 deletions
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15
sys/src/libthread/ioproc.c
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@ -19,6 +19,15 @@ iointerrupt(Ioproc *io)
qunlock(io);
}
static int
openprocctl(void)
{
char buf[32];
snprint(buf, sizeof(buf), "/proc/%lud/ctl", (ulong)getpid());
return open(buf, OWRITE|OCEXEC);
}
static void
xioproc(void *a)
{
@ -28,15 +37,11 @@ xioproc(void *a)
c = a;
if(io = mallocz(sizeof(*io), 1)){
char buf[128];
/*
* open might fail, ignore it for programs like factotum
* that don't use iointerrupt() anyway.
*/
snprint(buf, sizeof(buf), "/proc/%d/ctl", getpid());
io->ctl = open(buf, OWRITE);
io->ctl = openprocctl();
if((io->creply = chancreate(sizeof(void*), 0)) == nil){
if(io->ctl >= 0)
close(io->ctl);