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Make system() and popen() thread safe

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This commit is contained in:
Justine Tunney 2022-10-13 15:38:31 -07:00
parent 997ce29ddc
commit f52f65b2e3
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GPG key ID: BE714B4575D6E328
19 changed files with 135 additions and 31 deletions
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11
libc/runtime/fork.c
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@ -21,19 +21,23 @@
#include "libc/calls/struct/sigset.internal.h"
#include "libc/calls/syscall-nt.internal.h"
#include "libc/calls/syscall-sysv.internal.h"
#include "libc/calls/syscall_support-sysv.internal.h"
#include "libc/dce.h"
#include "libc/intrin/atomic.h"
#include "libc/intrin/strace.internal.h"
#include "libc/intrin/weaken.h"
#include "libc/nt/process.h"
#include "libc/runtime/internal.h"
#include "libc/sysv/consts/sig.h"
#include "libc/thread/posixthread.internal.h"
#include "libc/thread/tls.h"
int _fork(uint32_t dwCreationFlags) {
axdx_t ad;
sigset_t old, all;
int ax, dx, parent;
int ax, dx, parent, parent_tid = 0;
if (_weaken(_pthread_atfork)) {
parent_tid = gettid();
}
if (!IsWindows()) {
sigfillset(&all);
sys_sigprocmask(SIG_BLOCK, &all, &old);
@ -61,6 +65,9 @@ int _fork(uint32_t dwCreationFlags) {
IsLinux() ? dx : sys_gettid(),
memory_order_relaxed);
}
if (_weaken(_pthread_atfork)) {
_weaken(_pthread_atfork)(parent_tid);
}
if (!IsWindows()) sys_sigprocmask(SIG_SETMASK, &old, 0);
STRACE("fork() → 0 (child of %d)", parent);
} else {