fix incorrect allocation failure check in pthread_create

mmap returns MAP_FAILED not 0 because some idiot thought the ability
to mmap the null pointer page would be a good idea...

diff --git a/src/thread/pthread_create.c b/src/thread/pthread_create.c
index f7768d8d03dd1dc9e8c5c26c974d9a86a8176571..0189f02844f1e7af23f25e273b6ff321fdbceb57 100644 (file)
--- a/src/thread/pthread_create.c
+++ b/src/thread/pthread_create.c
@@ -102,7 +102,7 @@ int pthread_create(pthread_t *res, const pthread_attr_t *attr, void *(*entry)(vo
        }
        size += __pthread_tsd_size;
        map = mmap(0, size, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANON, -1, 0);
-       if (!map) return EAGAIN;
+       if (map == MAP_FAILED) return EAGAIN;
        if (guard) mprotect(map, guard, PROT_NONE);
 
        tsd = map + size - __pthread_tsd_size;