util: add pipe_eof()

[elogind.git] / src / util.c

diff --git a/src/util.c b/src/util.c
index 7f59021826d123ce75dbab6f6739c798f806ca2c..4a735dba58025345e4ef5255449ddb424c035960 100644 (file)
--- a/src/util.c
+++ b/src/util.c
@@ -4437,6 +4437,24 @@ char* hostname_cleanup(char *s) {
         return s;
 }
 
+int pipe_eof(int fd) {
+        struct pollfd pollfd;
+        int r;
+
+        zero(pollfd);
+        pollfd.fd = fd;
+        pollfd.events = POLLIN|POLLHUP;
+
+        r = poll(&pollfd, 1, 0);
+        if (r < 0)
+                return -errno;
+
+        if (r == 0)
+                return 0;
+
+        return pollfd.revents & POLLHUP;
+}
+
 int terminal_vhangup_fd(int fd) {
         if (ioctl(fd, TIOCVHANGUP) < 0)
                 return -errno;