1 files changed, 103 insertions, 0 deletions
diff --git a/stubs.c b/stubs.c
index d267fa6..c553e4d 100644
--- a/stubs.c
+++ b/stubs.c
@@ -25,6 +25,8 @@
  */
 
 #include <pthread.h>
+#include <errno.h>
+#include <semaphore.h>
 #include "config.h"
 
 #ifndef HAVE_PTHREAD_SELF
@@ -126,6 +128,51 @@ int pthread_equal() __attribute__ ((weak, alias ("__pthread_equal_stub")));
 # endif
 #endif
 
+#ifndef HAVE_SEM_INIT
+#define NEED_SEM_INIT_STUB
+# ifdef SUPPORT_ATTRIBUTE_ALIAS
+int sem_init() __attribute__ ((weak, alias ("__sem_init_stub")));
+# else
+#  pragma weak sem_init = __sem_init_stub
+# endif
+#endif
+
+#ifndef HAVE_SEM_DESTROY
+#define NEED_ZERO_STUB
+# ifdef SUPPORT_ATTRIBUTE_ALIAS
+int sem_destroy() __attribute__ ((weak, alias ("__pthread_zero_stub")));
+# else
+#  pragma weak sem_destroy = __sem_destroy_stub
+# endif
+#endif
+
+#ifndef HAVE_SEM_WAIT
+#define NEED_SEM_WAIT_STUB
+# ifdef SUPPORT_ATTRIBUTE_ALIAS
+int sem_wait() __attribute__ ((weak, alias ("__sem_wait_stub")));
+# else
+#  pragma weak sem_wait = __sem_wait_stub
+# endif
+#endif
+
+#ifndef HAVE_SEM_TRYWAIT
+#define NEED_SEM_TRYWAIT_STUB
+# ifdef SUPPORT_ATTRIBUTE_ALIAS
+int sem_trywait() __attribute__ ((weak, alias ("__sem_trywait_stub")));
+# else
+#  pragma weak sem_trywait = __sem_trywait_stub
+# endif
+#endif
+
+#ifndef HAVE_SEM_POST
+#define NEED_SEM_POST_STUB
+# ifdef SUPPORT_ATTRIBUTE_ALIAS
+int sem_post() __attribute__ ((weak, alias ("__sem_post_stub")));
+# else
+#  pragma weak sem_post = __sem_post_stub
+# endif
+#endif
+
 #ifdef NEED_ZERO_STUB
 static int __pthread_zero_stub()
 {
@@ -139,3 +186,59 @@ static int __pthread_equal_stub(pthread_t t1, pthread_t t2)
     return (t1 == t2);
 }
 #endif
+
+#ifdef NEED_SEM_INIT_STUB
+static int __sem_init_stub(sem_t *_sem, int pshared, unsigned int value)
+{
+    unsigned int *sem = (unsigned int *) _sem;
+    if (pshared) {
+	errno = ENOSYS;
+	return -1;
+    }
+
+    if (sizeof(sem_t) < sizeof(unsigned int)) {
+	errno = ENOSYS;
+	return -1;
+    }
+
+    *sem = value;
+    return 0;
+}
+#endif
+
+#ifdef NEED_SEM_WAIT_STUB
+static int __sem_wait_stub(sem_t *_sem)
+{
+    unsigned int *sem = (unsigned int *) _sem;
+    if (!*sem) {
+	/* Not available, simulate a blocking sem_wait */
+	pause();
+	errno = EINTR;
+	return -1;
+    }
+    *sem--;
+    return 0;
+}
+#endif
+
+#ifdef NEED_SEM_TRYWAIT_STUB
+static int __sem_trywait_stub(sem_t *_sem)
+{
+    unsigned int *sem = (unsigned int *) _sem;
+    if (!*sem) {
+	errno = EAGAIN;
+	return -1;
+    }
+    *sem--;
+    return 0;
+}
+#endif
+
+#ifdef NEED_SEM_POST_STUB
+static int __sem_post_stub(sem_t *_sem)
+{
+    unsigned int *sem = (unsigned int *) _sem;
+    *sem++;
+    return 0;
+}
+#endif