[CRIU] [PATCH 1/4] log: Don't modify global @errno in __print_on_level

[Cyrill Gorcunov]

The __print_on_level routine may modify global @errno
variable which is inacceptable: this is logging routine
which must be transparent to the rest of the program code.

Thus save @errno in local @__errno variable and restore
it on return.

Signed-off-by: Cyrill Gorcunov <gorcunov at openvz.org>
---
 log.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/log.c b/log.c
index a9f1757efa5a..e32e38b2afc3 100644
--- a/log.c
+++ b/log.c
@@ -155,6 +155,7 @@ unsigned int log_get_loglevel(void)
 static void __print_on_level(unsigned int loglevel, const char *format, va_list params)
 {
 	int fd, size, ret, off = 0;
+	int __errno = errno;
 
 	if (unlikely(loglevel == LOG_MSG)) {
 		fd = STDOUT_FILENO;
@@ -176,6 +177,7 @@ static void __print_on_level(unsigned int loglevel, const char *format, va_list
 			break;
 		off += ret;
 	}
+	errno =  __errno;
 }
 
 void print_on_level(unsigned int loglevel, const char *format, ...)
-- 
1.9.3