Use posix_fallocate when available

2 files changed, 25 insertions, 23 deletions

diff --git a/meson.build b/meson.build
index 3aefd8f8..d43d22f1 100644
--- a/meson.build
+++ b/meson.build
@@ -130,6 +130,10 @@ else
 	exclude_headers += 'xwayland.h'
 endif
 
+if cc.has_header_symbol('fcntl.h', 'posix_fallocate', prefix: '#define _POSIX_C_SOURCE 200112L')
+	conf_data.set('WLR_HAS_POSIX_FALLOCATE', true)
+endif
+
 includedir = get_option('includedir')
 exclude_headers += 'meson.build'
 install_subdir('include/wlr', install_dir: includedir, exclude_files: exclude_headers)
diff --git a/util/os-compatibility.c b/util/os-compatibility.c
index 38333605..70539eef 100644
--- a/util/os-compatibility.c
+++ b/util/os-compatibility.c
@@ -23,7 +23,7 @@
  * SOFTWARE.
  */
 
-#define _XOPEN_SOURCE 700
+#define _POSIX_C_SOURCE 200809L
 #include <errno.h>
 #include <fcntl.h>
 #include <stdlib.h>
@@ -35,17 +35,18 @@
 #include "util/os-compatibility.h"
 
 int os_fd_set_cloexec(int fd) {
-	long flags;
-
-	if (fd == -1)
+	if (fd == -1) {
 		return -1;
+	}
 
-	flags = fcntl(fd, F_GETFD);
-	if (flags == -1)
+	long flags = fcntl(fd, F_GETFD);
+	if (flags == -1) {
 		return -1;
+	}
 
-	if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) == -1)
+	if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) == -1) {
 		return -1;
+	}
 
 	return 0;
 }
@@ -58,15 +59,14 @@ int set_cloexec_or_close(int fd) {
 	return fd;
 }
 
-int create_tmpfile_cloexec(char *tmpname)
-{
+int create_tmpfile_cloexec(char *tmpname) {
 	int fd;
-
 	mode_t prev_umask = umask(0066);
 #ifdef HAVE_MKOSTEMP
 	fd = mkostemp(tmpname, O_CLOEXEC);
-	if (fd >= 0)
+	if (fd >= 0) {
 		unlink(tmpname);
+	}
 #else
 	fd = mkstemp(tmpname);
 	if (fd >= 0) {
@@ -102,32 +102,29 @@ int create_tmpfile_cloexec(char *tmpname)
  */
 int os_create_anonymous_file(off_t size) {
 	static const char template[] = "/wlroots-shared-XXXXXX";
-	const char *path;
-	char *name;
-	int fd;
-	int ret;
 
-	path = getenv("XDG_RUNTIME_DIR");
+	const char *path = getenv("XDG_RUNTIME_DIR");
 	if (!path) {
 		errno = ENOENT;
 		return -1;
 	}
 
-	name = malloc(strlen(path) + sizeof(template));
-	if (!name)
+	char *name = malloc(strlen(path) + sizeof(template));
+	if (!name) {
 		return -1;
+	}
 
 	strcpy(name, path);
 	strcat(name, template);
 
-	fd = create_tmpfile_cloexec(name);
-
+	int fd = create_tmpfile_cloexec(name);
 	free(name);
-
-	if (fd < 0)
+	if (fd < 0) {
 		return -1;
+	}
 
-#ifdef HAVE_POSIX_FALLOCATE
+#ifdef WLR_HAS_POSIX_FALLOCATE
+	int ret;
 	do {
 		ret = posix_fallocate(fd, 0, size);
 	} while (ret == EINTR);
@@ -137,6 +134,7 @@ int os_create_anonymous_file(off_t size) {
 		return -1;
 	}
 #else
+	int ret;
 	do {
 		ret = ftruncate(fd, size);
 	} while (ret < 0 && errno == EINTR);