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[thirdparty/glibc.git] / sysdeps / posix / shm_open.c

diff --git a/sysdeps/posix/shm_open.c b/sysdeps/posix/shm_open.c
index d18ca07802a1b7bda068821e585a4f490027f979..3c4eb08c901028756cfbdb88aed222da9896e38a 100644 (file)
--- a/sysdeps/posix/shm_open.c
+++ b/sysdeps/posix/shm_open.c
@@ -1,5 +1,5 @@
 /* shm_open -- open a POSIX shared memory object.  Generic POSIX file version.
-   Copyright (C) 2001,2002,2005 Free Software Foundation, Inc.
+   Copyright (C) 2001-2019 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -14,71 +14,43 @@
 
    You should have received a copy of the GNU Lesser General Public
    License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
+   <https://www.gnu.org/licenses/>.  */
 
 #include <unistd.h>
 
 #if ! _POSIX_MAPPED_FILES
-#include <rt/shm_open.c>
+
+# include <rt/shm_open.c>
 
 #else
 
-#include <errno.h>
-#include <sys/mman.h>
-#include <fcntl.h>
-#include <string.h>
-#include <stdlib.h>
-#include <paths.h>
+# include <fcntl.h>
+# include <pthread.h>
+# include <shm-directory.h>
 
-#define SHMDIR (_PATH_DEV "shm/")
 
 /* Open shared memory object.  */
 int
 shm_open (const char *name, int oflag, mode_t mode)
 {
-  size_t namelen;
-  char *fname;
-  int fd;
-
-  /* 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);
-
-  fd = open (name, oflag, mode);
-  if (fd != -1)
-    {
-      /* We got a descriptor.  Now set the FD_CLOEXEC bit.  */
-      int flags = fcntl (fd, F_GETFD, 0);
-
-      if (__builtin_expect (flags, 0) != -1)
-       {
-         flags |= FD_CLOEXEC;
-         flags = fcntl (fd, F_SETFD, flags);
-       }
-
-      if (flags == -1)
-       {
-         /* Something went wrong.  We cannot return the descriptor.  */
-         int save_errno = errno;
-         close (fd);
-         fd = -1;
-         __set_errno (save_errno);
-       }
-    }
+  SHM_GET_NAME (EINVAL, -1, "");
+
+  oflag |= O_NOFOLLOW | O_CLOEXEC;
+
+  /* Disable asynchronous cancellation.  */
+  int state;
+  pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, &state);
+
+  int fd = open (shm_name, oflag, mode);
+  if (fd == -1 && __glibc_unlikely (errno == EISDIR))
+    /* It might be better to fold this error with EINVAL since
+       directory names are just another example for unsuitable shared
+       object names and the standard does not mention EISDIR.  */
+    __set_errno (EINVAL);
+
+  pthread_setcancelstate (state, NULL);
 
   return fd;
 }
 
-#endif
+#endif  /* _POSIX_MAPPED_FILES */