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-rw-r--r--libc/bionic/semaphore.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/libc/bionic/semaphore.c b/libc/bionic/semaphore.c
index 0c94600..f4eebce 100644
--- a/libc/bionic/semaphore.c
+++ b/libc/bionic/semaphore.c
@@ -196,7 +196,8 @@ int sem_trywait(sem_t *sem)
if (__atomic_dec_if_positive(&sem->count) > 0) {
return 0;
} else {
- return EAGAIN;
+ errno = EAGAIN;
+ return -1;
}
}