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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-04-30 12:29:33 +0200
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-05-02 12:40:06 +0200
commitc1efe73569d429b49a9e6e1c9c72b947d414270c (patch)
tree953a2d4943a36b62023391d5ae5073dfd6087029 /lib/util/read_retry.c
parenta85c6025903a2b6e97e1938b201b3361a0cbed66 (diff)
Add utility functions
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'lib/util/read_retry.c')
-rw-r--r--lib/util/read_retry.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/lib/util/read_retry.c b/lib/util/read_retry.c
new file mode 100644
index 0000000..eb113c4
--- /dev/null
+++ b/lib/util/read_retry.c
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+#include <unistd.h>
+#include <errno.h>
+
+#include "util.h"
+
+ssize_t read_retry(int fd, void *buffer, size_t size)
+{
+ ssize_t ret, total = 0;
+
+ while (size > 0) {
+ ret = read(fd, buffer, size);
+ if (ret < 0) {
+ if (errno == EINTR)
+ continue;
+ return -1;
+ }
+ if (ret == 0)
+ break;
+
+ total += ret;
+ size -= ret;
+ buffer = (char *)buffer + ret;
+ }
+
+ return total;
+}