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/* 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;

}