Merge branch 'ss/commit-squash-msg' into maint

diff --git a/wrapper.c b/wrapper.c
index 32c6c609da0fbc3a40d17b34de61bffa7c43700c..9afc1a021c224d4ff2230fffeb0e4f0882d4a99e 100644 (file)
--- a/wrapper.c
+++ b/wrapper.c
@@ -239,8 +239,24 @@ ssize_t xread(int fd, void *buf, size_t len)
            len = MAX_IO_SIZE;
        while (1) {
                nr = read(fd, buf, len);
-               if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
-                       continue;
+               if (nr < 0) {
+                       if (errno == EINTR)
+                               continue;
+                       if (errno == EAGAIN || errno == EWOULDBLOCK) {
+                               struct pollfd pfd;
+                               pfd.events = POLLIN;
+                               pfd.fd = fd;
+                               /*
+                                * it is OK if this poll() failed; we
+                                * want to leave this infinite loop
+                                * only when read() returns with
+                                * success, or an expected failure,
+                                * which would be checked by the next
+                                * call to read(2).
+                                */
+                               poll(&pfd, 1, -1);
+                       }
+               }
                return nr;
        }
 }