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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;
}
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