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hurd: Implement SHM_ANON

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This adds a special SHM_ANON value that can be passed into shm_open ()
in place of a name. When called in this way, shm_open () will create a
new anonymous shared memory file. The file will be created in the same
way that other shared memory files are created (i.e., under /dev/shm/),
except that it is not given a name and therefore cannot be reached from
the file system, nor by other calls to shm_open (). This is accomplished
by utilizing O_TMPFILE.

This is intended to be compatible with FreeBSD's API of the same name.

Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
Message-Id: <20230130125216.6254-4-bugaevc@gmail.com>
This commit is contained in:
Sergey Bugaev
2023-01-30 15:52:16 +03:00
committed by Samuel Thibault
parent 65392c8478
commit a979b72747
3 changed files with 51 additions and 4 deletions
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5
rt/shm_open.c
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@ -23,6 +23,7 @@
#include <shlib-compat.h>
#include <shm-directory.h>
#include <unistd.h>
#include <sys/mman.h>
/* Open shared memory object. */
int
@ -36,6 +37,10 @@ __shm_open (const char *name, int oflag, mode_t mode)
}
oflag |= O_NOFOLLOW | O_CLOEXEC;
#if defined (SHM_ANON) && defined (O_TMPFILE)
if (name == SHM_ANON)
oflag |= O_TMPFILE;
#endif
int fd = __open64_nocancel (dirname.name, oflag, mode);
if (fd == -1 && __glibc_unlikely (errno == EISDIR))