From 7736feb2769e32b669bffcccb89483163116ed5c Mon Sep 17 00:00:00 2001
From: Jeff Johnston <jjohnstn@redhat.com>
Date: Wed, 22 May 2002 20:26:28 +0000
Subject: 2002-05-22  Jeff Johnston  <jjohnstn@redhat.com>

        * libc/sys/linux/shm_open.c: New file.
        * libc/sys/linux/shm_unlink.c: Ditto.
        * libc/sys/linux/Makefile.am: Add support for shm_open.c and
        shm_unlink.c.
        * libc/sys/linux/Makefile.in: Regenerated.
        * libc/sys/linux/sys/types.h: Add some additional checks to see
        if clock_t or time_t is already defined.
---
 newlib/libc/sys/linux/shm_open.c | 48 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 newlib/libc/sys/linux/shm_open.c

(limited to 'newlib/libc/sys/linux/shm_open.c')

diff --git a/newlib/libc/sys/linux/shm_open.c b/newlib/libc/sys/linux/shm_open.c
new file mode 100644
index 000000000..cb92c3ae4
--- /dev/null
+++ b/newlib/libc/sys/linux/shm_open.c
@@ -0,0 +1,48 @@
+/* shm_open - open a shared memory file */
+
+/* Copyright 2002, Red Hat Inc. */
+
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <unistd.h>
+#include <string.h>
+#include <fcntl.h>
+#include <limits.h>
+
+int
+shm_open (const char *name, int oflag, mode_t mode)
+{
+  int fd;
+  char shm_name[PATH_MAX+20] = "/dev/shm/";
+
+  /* skip opening slash */
+  if (*name == '/')
+    ++name;
+
+  /* create special shared memory file name and leave enough space to
+     cause a path/name error if name is too long */
+  strlcpy (shm_name + 9, name, PATH_MAX + 10);
+
+  fd = open (shm_name, oflag, mode);
+
+  if (fd != -1)
+    {
+      /* once open we must add FD_CLOEXEC flag to file descriptor */
+      int flags = fcntl (fd, F_GETFD, 0);
+
+      if (flags >= 0)
+        {
+          flags |= FD_CLOEXEC;
+          flags = fcntl (fd, F_SETFD, flags);
+        }
+
+      /* on failure, just close file and give up */
+      if (flags == -1)
+        {
+          close (fd);
+          fd = -1;
+        }
+    }
+
+  return fd;
+}
-- 
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