[iproute PATCH 51/51] lib/bpf: Check return value of write()

[Phil Sutter]

This is merely to silence the compiler warning. If write to stderr
failed, assume that printing an error message will fail as well so don't
even try.

Signed-off-by: Phil Sutter <p...@nwl.cc>
---
 lib/bpf.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/bpf.c b/lib/bpf.c
index 1dcb261dc915f..825e071cea572 100644
--- a/lib/bpf.c
+++ b/lib/bpf.c
@@ -591,7 +591,8 @@ int bpf_trace_pipe(void)
 
                ret = read(fd, buff, sizeof(buff) - 1);
                if (ret > 0) {
-                       write(2, buff, ret);
+                       if (write(STDERR_FILENO, buff, ret) != ret)
+                               return -1;
                        fflush(stderr);
                }
        }
-- 
2.13.1