summaryrefslogtreecommitdiff
path: root/src/shared/copy.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/shared/copy.c')
-rw-r--r--src/shared/copy.c85
1 files changed, 59 insertions, 26 deletions
diff --git a/src/shared/copy.c b/src/shared/copy.c
index 3744797b95..a863246b2b 100644
--- a/src/shared/copy.c
+++ b/src/shared/copy.c
@@ -19,17 +19,20 @@
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
+#include <sys/sendfile.h>
+
#include "util.h"
#include "copy.h"
int copy_bytes(int fdf, int fdt, off_t max_bytes) {
+ bool try_sendfile = true;
+
assert(fdf >= 0);
assert(fdt >= 0);
for (;;) {
- char buf[PIPE_BUF];
- ssize_t n, k;
- size_t m = sizeof(buf);
+ size_t m = PIPE_BUF;
+ ssize_t n;
if (max_bytes != (off_t) -1) {
@@ -40,19 +43,44 @@ int copy_bytes(int fdf, int fdt, off_t max_bytes) {
m = (size_t) max_bytes;
}
- n = read(fdf, buf, m);
- if (n < 0)
- return -errno;
- if (n == 0)
- break;
+ /* First try sendfile(), unless we already tried */
+ if (try_sendfile) {
+
+ n = sendfile(fdt, fdf, NULL, m);
+ if (n < 0) {
+ if (errno != EINVAL && errno != ENOSYS)
+ return -errno;
+
+ try_sendfile = false;
+ /* use fallback below */
+ } else if (n == 0) /* EOF */
+ break;
+ else if (n > 0)
+ /* Succcess! */
+ goto next;
+ }
+
+ /* As a fallback just copy bits by hand */
+ {
+ char buf[m];
+ ssize_t k;
- errno = 0;
- k = loop_write(fdt, buf, n, false);
- if (k < 0)
- return k;
- if (k != n)
- return errno ? -errno : -EIO;
+ n = read(fdf, buf, m);
+ if (n < 0)
+ return -errno;
+ if (n == 0) /* EOF */
+ break;
+
+ errno = 0;
+ k = loop_write(fdt, buf, n, false);
+ if (k < 0)
+ return k;
+ if (k != n)
+ return errno ? -errno : -EIO;
+
+ }
+ next:
if (max_bytes != (off_t) -1) {
assert(max_bytes >= n);
max_bytes -= n;
@@ -262,34 +290,39 @@ int copy_tree(const char *from, const char *to, bool merge) {
return -ENOTSUP;
}
-int copy_file(const char *from, const char *to, int flags, mode_t mode) {
- _cleanup_close_ int fdf = -1, fdt = -1;
- int r;
+int copy_file_fd(const char *from, int fdt) {
+ _cleanup_close_ int fdf = -1;
assert(from);
- assert(to);
+ assert(fdt >= 0);
fdf = open(from, O_RDONLY|O_CLOEXEC|O_NOCTTY);
if (fdf < 0)
return -errno;
+ return copy_bytes(fdf, fdt, (off_t) -1);
+}
+
+int copy_file(const char *from, const char *to, int flags, mode_t mode) {
+ int fdt, r;
+
+ assert(from);
+ assert(to);
+
fdt = open(to, flags|O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, mode);
if (fdt < 0)
return -errno;
- r = copy_bytes(fdf, fdt, (off_t) -1);
+ r = copy_file_fd(from, fdt);
if (r < 0) {
+ close(fdt);
unlink(to);
return r;
}
- r = close(fdt);
- fdt = -1;
-
- if (r < 0) {
- r = -errno;
- unlink(to);
- return r;
+ if (close(fdt) < 0) {
+ unlink_noerrno(to);
+ return -errno;
}
return 0;