Merge pull request #3263 from orestisf1993/misbehaving-ipc-queue-2999

Kill misbehaving subscribed clients instead of hanging

libi3/safewrappers.c

@@ -68,10 +68,9 @@ int sasprintf(char **strp, const char *fmt, ...) {
 
 ssize_t writeall(int fd, const void *buf, size_t count) {
     size_t written = 0;
-    ssize_t n = 0;
 
     while (written < count) {
-        n = write(fd, buf + written, count - written);
+        const ssize_t n = write(fd, buf + written, count - written);
         if (n == -1) {
             if (errno == EINTR || errno == EAGAIN)
                 continue;
@@ -83,6 +82,25 @@ ssize_t writeall(int fd, const void *buf, size_t count) {
     return written;
 }
 
+ssize_t writeall_nonblock(int fd, const void *buf, size_t count) {
+    size_t written = 0;
+
+    while (written < count) {
+        const ssize_t n = write(fd, buf + written, count - written);
+        if (n == -1) {
+            if (errno == EAGAIN) {
+                return written;
+            } else if (errno == EINTR) {
+                continue;
+            } else {
+                return n;
+            }
+        }
+        written += (size_t)n;
+    }
+    return written;
+}
+
 ssize_t swrite(int fd, const void *buf, size_t count) {
     ssize_t n;