X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=ipc.c;h=d7f515dfec8788f267a41f8c33264d25b15abf8a;hp=9488224a1d4a622860adc957b27977e2bcbfc7e2;hb=5afe721aeb241bd21b832994ec2f2b7d8ff84766;hpb=e0f54e42887a8beef092755f5ed9cdf6d499bef2

diff --git a/ipc.c b/ipc.c
index 9488224a..d7f515df 100644
--- a/ipc.c
+++ b/ipc.c
@@ -161,6 +161,27 @@ int shm_attach(int id, enum shm_attach_mode mode, void **result)
 	return *result == (void *) -1? -ERRNO_TO_PARA_ERROR(errno) : 1;
 }
 
+/**
+ * Get the size of a shared memory segment.
+ *
+ * \param id The shared memory segment identifier.
+ * \param result Size in bytes is returned here, zero on errors.
+ *
+ * \return Standard.
+ *
+ * \sa shmctl(2).
+ */
+int shm_size(int id, size_t *result)
+{
+	struct shmid_ds ds; /* data structure */
+
+	*result = 0;
+	if (shmctl(id, IPC_STAT, &ds) < 0)
+		return -ERRNO_TO_PARA_ERROR(errno);
+	*result = ds.shm_segsz;
+	return 1;
+}
+
 /**
  * Detach a shared memory segment.
  *