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| author | Sergey Bugaev <bugaevc@gmail.com> | 2023-01-30 15:52:16 +0300 |
|---|---|---|
| committer | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2023-02-01 23:36:11 +0100 |
| commit | a979b72747e34add3433a23c0966490cd809120f (patch) | |
| tree | 45d4888dc9ee62a8d851dc27b435516f827718b5 /rt | |
| parent | 65392c84782a53b0d7705ca0207c95c3da41c7dc (diff) | |
| download | glibc-a979b72747e34add3433a23c0966490cd809120f.zip glibc-a979b72747e34add3433a23c0966490cd809120f.tar.gz glibc-a979b72747e34add3433a23c0966490cd809120f.tar.bz2 | |
hurd: Implement SHM_ANON
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>
Diffstat (limited to 'rt')
| -rw-r--r-- | rt/shm_open.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/rt/shm_open.c b/rt/shm_open.c index 48970bb..6c1f4d6 100644 --- a/rt/shm_open.c +++ b/rt/shm_open.c @@ -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)) |