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-rw-r--r--src/mman/shm_open.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/src/mman/shm_open.c b/src/mman/shm_open.c
new file mode 100644
index 00000000..d368622d
--- /dev/null
+++ b/src/mman/shm_open.c
@@ -0,0 +1,21 @@
+#include <sys/mman.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+
+int shm_open(const char *name, int flag, mode_t mode)
+{
+ int fd, dir;
+
+ while (*name == '/') name++;
+ if (strchr(name, '/')) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ if ((dir = open("/dev/shm", O_DIRECTORY|O_RDONLY)) < 0) return -1;
+ fd = openat(dir, name, flag|O_NOFOLLOW|O_CLOEXEC|O_NONBLOCK, mode);
+ close(dir);
+ return fd;
+}