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Use memfd on FreeBSD 13, shm_open(SHM_ANON) on older versions

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/dev/shm usually does not exist on FreeBSD, so the mkostemp call was failing.
FreeBSD 13 offers memfd support complete with seals, use it.
This commit is contained in:
Greg V 2020-11-09 00:51:44 +03:00 • committed by Wim Taymans
parent 90ade199e6
commit 6ffb997c5a
1 changed files with 12 additions and 7 deletions
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19
src/pipewire/mem.c
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@ -43,11 +43,7 @@
#define NAME "mempool"
#ifndef __FreeBSD__
#define USE_MEMFD
#endif
#if defined(USE_MEMFD) && !defined(HAVE_MEMFD_CREATE)
#if !defined(__FreeBSD__) && !defined(HAVE_MEMFD_CREATE)
/*
* No glibc wrappers exist for memfd_create(2), so provide our own.
*
@ -60,6 +56,8 @@ static inline int memfd_create(const char *name, unsigned int flags)
{
return syscall(SYS_memfd_create, name, flags);
}
#define HAVE_MEMFD_CREATE 1
#endif
/* memfd_create(2) flags */
@ -478,13 +476,20 @@ struct pw_memblock * pw_mempool_alloc(struct pw_mempool *pool, enum pw_memblock_
spa_list_init(&b->mappings);
spa_list_init(&b->memmaps);
#ifdef USE_MEMFD
#ifdef HAVE_MEMFD_CREATE
b->this.fd = memfd_create("pipewire-memfd", MFD_CLOEXEC | MFD_ALLOW_SEALING);
if (b->this.fd == -1) {
res = -errno;
pw_log_error(NAME" %p: Failed to create memfd: %m", pool);
goto error_free;
}
#elif defined(__FreeBSD__)
b->this.fd = shm_open(SHM_ANON, O_CREAT | O_RDWR | O_CLOEXEC, 0);
if (b->this.fd == -1) {
res = -errno;
pw_log_error(NAME" %p: Failed to create SHM_ANON fd: %m", pool);
goto error_free;
}
#else
char filename[] = "/dev/shm/pipewire-tmpfile.XXXXXX";
b->this.fd = mkostemp(filename, O_CLOEXEC);
@ -501,7 +506,7 @@ struct pw_memblock * pw_mempool_alloc(struct pw_mempool *pool, enum pw_memblock_
pw_log_warn(NAME" %p: Failed to truncate temporary file: %m", pool);
goto error_close;
}
#ifdef USE_MEMFD
#ifdef HAVE_MEMFD_CREATE
if (flags & PW_MEMBLOCK_FLAG_SEAL) {
unsigned int seals = F_SEAL_GROW | F_SEAL_SHRINK | F_SEAL_SEAL;
if (fcntl(b->this.fd, F_ADD_SEALS, seals) == -1) {