remove impossible error case from gethostbyname2_r

[musl] / src / aio / aio.c

diff --git a/src/aio/aio.c b/src/aio/aio.c
index dae97cc..a1a3e79 100644 (file)
--- a/src/aio/aio.c
+++ b/src/aio/aio.c
@@ -9,6 +9,12 @@
 #include "syscall.h"
 #include "atomic.h"
 #include "pthread_impl.h"
+#include "aio_impl.h"
+
+#define malloc __libc_malloc
+#define calloc __libc_calloc
+#define realloc __libc_realloc
+#define free __libc_free
 
 /* The following is a threads-based implementation of AIO with minimal
  * dependence on implementation details. Most synchronization is
@@ -70,6 +76,10 @@ static struct aio_queue *****map;
 static volatile int aio_fd_cnt;
 volatile int __aio_fut;
 
+static size_t io_thread_stack_size;
+
+#define MAX(a,b) ((a)>(b) ? (a) : (b))
+
 static struct aio_queue *__aio_get_queue(int fd, int need)
 {
        if (fd < 0) {
@@ -84,6 +94,10 @@ static struct aio_queue *__aio_get_queue(int fd, int need)
                pthread_rwlock_unlock(&maplock);
                if (fcntl(fd, F_GETFD) < 0) return 0;
                pthread_rwlock_wrlock(&maplock);
+               if (!io_thread_stack_size) {
+                       unsigned long val = __getauxval(AT_MINSIGSTKSZ);
+                       io_thread_stack_size = MAX(MINSIGSTKSZ+2048, val+512);
+               }
                if (!map) map = calloc(sizeof *map, (-1U/2+1)>>24);
                if (!map) goto out;
                if (!map[a]) map[a] = calloc(sizeof **map, 256);
@@ -259,15 +273,6 @@ static void *io_thread_func(void *ctx)
        return 0;
 }
 
-static size_t io_thread_stack_size = MINSIGSTKSZ+2048;
-static pthread_once_t init_stack_size_once;
-
-static void init_stack_size()
-{
-       unsigned long val = __getauxval(AT_MINSIGSTKSZ);
-       if (val > MINSIGSTKSZ) io_thread_stack_size = val + 512;
-}
-
 static int submit(struct aiocb *cb, int op)
 {
        int ret = 0;
@@ -280,6 +285,8 @@ static int submit(struct aiocb *cb, int op)
 
        if (!q) {
                if (errno != EBADF) errno = EAGAIN;
+               cb->__ret = -1;
+               cb->__err = errno;
                return -1;
        }
        q->ref++;
@@ -291,7 +298,6 @@ static int submit(struct aiocb *cb, int op)
                else
                        pthread_attr_init(&a);
        } else {
-               pthread_once(&init_stack_size_once, init_stack_size);
                pthread_attr_init(&a);
                pthread_attr_setstacksize(&a, io_thread_stack_size);
                pthread_attr_setguardsize(&a, 0);
@@ -303,8 +309,8 @@ static int submit(struct aiocb *cb, int op)
        if (pthread_create(&td, &a, io_thread_func, &args)) {
                pthread_mutex_lock(&q->lock);
                __aio_unref_queue(q);
-               errno = EAGAIN;
-               ret = -1;
+               cb->__err = errno = EAGAIN;
+               cb->__ret = ret = -1;
        }
        pthread_sigmask(SIG_SETMASK, &origmask, 0);
 
@@ -390,6 +396,20 @@ int __aio_close(int fd)
        return fd;
 }
 
+void __aio_atfork(int who)
+{
+       if (who<0) {
+               pthread_rwlock_rdlock(&maplock);
+               return;
+       }
+       if (who>0 && map) for (int a=0; a<(-1U/2+1)>>24; a++)
+               if (map[a]) for (int b=0; b<256; b++)
+                       if (map[a][b]) for (int c=0; c<256; c++)
+                               if (map[a][b][c]) for (int d=0; d<256; d++)
+                                       map[a][b][c][d] = 0;
+       pthread_rwlock_unlock(&maplock);
+}
+
 weak_alias(aio_cancel, aio_cancel64);
 weak_alias(aio_error, aio_error64);
 weak_alias(aio_fsync, aio_fsync64);