lib/sysfs: Handle EINTR from vfprintf()

Some write operations into sysfs may be slow and potentially interrupted
by a signal. So handle EINTR by repeating the vfprintf(). A partial is
reported back to the caller, as is any other error.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com

1 files changed, 3 insertions, 1 deletions

diff --git a/lib/igt_sysfs.c b/lib/igt_sysfs.c
index e7c67dae..030d1c6a 100644
--- a/lib/igt_sysfs.c
+++ b/lib/igt_sysfs.c
@@ -399,7 +399,9 @@ int igt_sysfs_vprintf(int dir, const char *attr, const char *fmt, va_list ap)
 
 	file = fdopen(fd, "w");
 	if (file) {
-		ret = vfprintf(file, fmt, ap);
+		do {
+			ret = vfprintf(file, fmt, ap);
+		} while (ret == -1 && errno == EINTR);
 		fclose(file);
 	}
 	close(fd);