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- From f7cfd36b8a93afd326c0d9378e99576c616bd3fc Mon Sep 17 00:00:00 2001
- From: Yousong Zhou <yszhou4tech@gmail.com>
- Date: Wed, 29 Apr 2015 14:21:12 +0800
- Subject: [PATCH 3/7] xl2tpd-control: open control file with O_NONBLOCK.
-
- Otherwise xl2tpd-control would block indefinitely in case xl2tpd is
- not running.
- ---
- xl2tpd-control.c | 10 +++++++++-
- 1 file changed, 9 insertions(+), 1 deletion(-)
-
- --- a/xl2tpd-control.c
- +++ b/xl2tpd-control.c
- @@ -246,7 +246,7 @@ int main (int argc, char *argv[])
- print_error (DEBUG_LEVEL, "command to be passed:\n%s\n", buf);
-
- /* try to open control file for writing */
- - int control_fd = open (control_filename, O_WRONLY, 0600);
- + int control_fd = open (control_filename, O_WRONLY | O_NONBLOCK, 0600);
- if (control_fd < 0)
- {
- int errorno = errno;
- @@ -265,6 +265,14 @@ int main (int argc, char *argv[])
- }
- return -1;
- }
- +
- + /* turn off O_NONBLOCK */
- + if (fcntl (control_fd, F_SETFL, O_WRONLY) == -1) {
- + print_error (ERROR_LEVEL,
- + "Can not turn off nonblocking mode for control_fd: %s\n",
- + strerror(errno));
- + return -2;
- + }
-
- /* pass command to control pipe */
- if (write (control_fd, buf, ftell (mesf)) < 0)
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