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authorDenys Vlasenko <vda.linux@googlemail.com>2017-02-16 20:04:19 +0100
committerDenys Vlasenko <vda.linux@googlemail.com>2017-02-16 20:04:19 +0100
commitdc207f669675a271812a21b0ddbe3b894adf8e4c (patch)
tree6d68282fa379fd778f7621ecb59450bfc85996e4
parent5b3b468ec0c6e6dfe772722dbd6b2c57cef817b5 (diff)
downloadbusybox-dc207f669675a271812a21b0ddbe3b894adf8e4c.tar.gz
udhcp: do not clobber errno by signal handler
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-rw-r--r--networking/udhcp/signalpipe.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/networking/udhcp/signalpipe.c b/networking/udhcp/signalpipe.c
index 6355c5e90..30bccd6bf 100644
--- a/networking/udhcp/signalpipe.c
+++ b/networking/udhcp/signalpipe.c
@@ -25,9 +25,11 @@ static struct fd_pair signal_pipe;
static void signal_handler(int sig)
{
+ int sv = errno;
unsigned char ch = sig; /* use char, avoid dealing with partial writes */
if (write(signal_pipe.wr, &ch, 1) != 1)
bb_perror_msg("can't send signal");
+ errno = sv;
}
/* Call this before doing anything else. Sets up the socket pair