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shm: prefer posix_fallocate over ftruncate

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Daniel Eklöf 2020-02-15 19:46:00 +01:00
parent 291410bd71
commit db830643d2
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GPG key ID: 5BBD4992C116573F
1 changed files with 14 additions and 3 deletions
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17
shm.c
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@ -6,6 +6,7 @@
#include <sys/types.h>
#include <sys/mman.h>
#include <linux/memfd.h>
#include <fcntl.h>
#include <pixman.h>
@ -123,9 +124,19 @@ shm_get_buffer(struct wl_shm *shm, int width, int height, unsigned long cookie)
size = stride * height;
LOG_DBG("cookie=%lx: allocating new buffer: %zu KB", cookie, size / 1024);
if (ftruncate(pool_fd, size) == -1) {
LOG_ERRNO("failed to truncate SHM pool");
goto err;
int err = posix_fallocate(pool_fd, 0, size);
if (err != 0) {
static bool failure_logged = false;
if (!failure_logged) {
failure_logged = true;
LOG_ERRNO_P("failed to fallocate", err);
}
if (ftruncate(pool_fd, size) == -1) {
LOG_ERRNO("failed to truncate SHM pool");
goto err;
}
}
mmapped = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, pool_fd, 0);