Move non-blocking-write code here from rtsp.c

common.c

@@ -33,6 +33,7 @@
 #include <time.h>
 #include <unistd.h>
 #include <popt.h>
+#include <poll.h>
 #include <sys/types.h>
 #include <sys/wait.h>
 
@@ -510,3 +511,28 @@ uint64_t get_absolute_time_in_fp() {
 #endif
   return time_now_fp;
 }
+
+ssize_t non_blocking_write(int fd, const void *buf, size_t count) {
+  // debug(1,"writing %u to pipe...",count);
+  // we are assuming that the count is always smaller than the FIFO's buffer
+  struct pollfd ufds[1];
+  ssize_t reply;
+  do {
+    ufds[0].fd = fd;
+    ufds[0].events = POLLOUT;
+    int rv = poll(ufds, 1, 5000);
+    if (rv == -1)
+      debug(1, "error waiting for pipe to unblock...");
+    if (rv == 0)
+      debug(1, "timeout waiting for pipe to unblock");
+    reply = write(fd, buf, count);
+    if ((reply == -1) && ((errno == EAGAIN) || (errno == EWOULDBLOCK)))
+      debug(1, "writing to pipe will block...");
+    //    else
+    //      debug(1,"writing %u to pipe done...",reply);
+  } while ((reply == -1) && ((errno == EAGAIN) || (errno == EWOULDBLOCK)));
+  return reply;
+
+  //  return write(fd,buf,count);
+}
+

common.h

@@ -90,6 +90,8 @@ int get_requested_connection_state_to_output();
 
 void set_requested_connection_state_to_output(int v);
 
+ssize_t non_blocking_write(int fd, const void *buf, size_t count); // used in a few places
+
 int debuglev;
 void die(char *format, ...);
 void warn(char *format, ...);