Refactor shm_{open,unlink} code to separate Linux-specific directory choice from POSIX-generic code.

sysdeps/posix/shm_unlink.c

@@ -24,37 +24,20 @@
 #else
 
 #include <errno.h>
-#include <sys/mman.h>
 #include <string.h>
-#include <stdlib.h>
-#include <paths.h>
+#include "shm-directory.h"
 
-#define SHMDIR	(_PATH_DEV "shm/")
 
 /* Remove shared memory object.  */
 int
 shm_unlink (const char *name)
 {
-  size_t namelen;
-  char *fname;
+  SHM_GET_NAME (ENOENT, -1);
 
-  /* Construct the filename.  */
-  while (name[0] == '/')
-    ++name;
-
-  if (name[0] == '\0')
-    {
-      /* The name "/" is not supported.  */
-      __set_errno (EINVAL);
-      return -1;
-    }
-
-  namelen = strlen (name);
-  fname = (char *) __alloca (sizeof SHMDIR - 1 + namelen + 1);
-  __mempcpy (__mempcpy (fname, SHMDIR, sizeof SHMDIR - 1),
-	     name, namelen + 1);
-
-  return unlink (name);
+  int result = unlink (shm_name);
+  if (result < 0 && errno == EPERM)
+    __set_errno (EACCES);
+  return result;
 }
 
 #endif