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waitpid: W_NOHANG

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Matheus
2024-05-01 21:37:19 -03:00
parent a4c117c36c
commit 5da946e0bd
1 changed files with 9 additions and 2 deletions
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kernel-src/sys/syscalls/waitpid.c
+9 -2
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@@ -4,6 +4,9 @@
#include <errno.h>
#include <logging.h>
#define WNOHANG 1
#define KNOWN_FLAGS WNOHANG
syscallret_t syscall_waitpid(context_t *context, pid_t pid, int *status, int options) {
syscallret_t ret = {
.ret = -1
@@ -11,7 +14,7 @@ syscallret_t syscall_waitpid(context_t *context, pid_t pid, int *status, int opt
// TODO address check
// TODO implement these
__assert(options == 0);
__assert((options & ~KNOWN_FLAGS) == 0);
__assert(pid == -1 || pid > 0);
thread_t *thread = _cpu()->thread;
@@ -30,7 +33,11 @@ syscallret_t syscall_waitpid(context_t *context, pid_t pid, int *status, int opt
return ret;
}
spinlock_release(&proc->lock);
if (semaphore_wait(&proc->waitsem, true)) {
if ((options & WNOHANG) && semaphore_test(&proc->waitsem) == false) {
ret.errno = 0;
ret.ret = 0;
return ret;
} else if ((options & WNOHANG) == 0 && semaphore_wait(&proc->waitsem, true)) {
ret.errno = EINTR;
return ret;
}