From c1efe73569d429b49a9e6e1c9c72b947d414270c Mon Sep 17 00:00:00 2001 From: David Oberhollenzer Date: Tue, 30 Apr 2019 12:29:33 +0200 Subject: Add utility functions Signed-off-by: David Oberhollenzer --- lib/util/read_retry.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) create mode 100644 lib/util/read_retry.c (limited to 'lib/util/read_retry.c') 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 +#include + +#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; +} -- cgit v1.2.3