[Qemu-devel] [PATCH 11/17] vl.c: fix warning with _FORTIFY_SOURCE

[Juan Quintela]

From: Kirill A. Shutemov <address@hidden>

CC    i386-softmmu/vl.o
cc1: warnings being treated as errors
/usr/src/RPM/BUILD/qemu-0.11.92/vl.c: In function 'qemu_event_increment':
/usr/src/RPM/BUILD/qemu-0.11.92/vl.c:3404: error: ignoring return value of 
'write', declared with attribute warn_unused_result
/usr/src/RPM/BUILD/qemu-0.11.92/vl.c: In function 'main':
/usr/src/RPM/BUILD/qemu-0.11.92/vl.c:5774: error: ignoring return value of 
'write', declared with attribute warn_unused_result
/usr/src/RPM/BUILD/qemu-0.11.92/vl.c:6064: error: ignoring return value of 
'chdir', declared with attribute warn_unused_result
/usr/src/RPM/BUILD/qemu-0.11.92/vl.c:6083: error: ignoring return value of 
'chdir', declared with attribute warn_unused_result
make[1]: *** [vl.o] Error 1

Signed-off-by: Kirill A. Shutemov <address@hidden>
Signed-off-by: Juan Quintela <address@hidden>
---
 vl.c |   22 ++++++++++++++++++----
 1 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/vl.c b/vl.c
index e070ec9..9c74038 100644
--- a/vl.c
+++ b/vl.c
@@ -3185,11 +3185,17 @@ static int io_thread_fd = -1;
 static void qemu_event_increment(void)
 {
     static const char byte = 0;
+    ssize_t ret;

     if (io_thread_fd == -1)
         return;

-    write(io_thread_fd, &byte, sizeof(byte));
+    ret = write(io_thread_fd, &byte, sizeof(byte));
+    if (ret < 0 && (errno != EINTR && errno != EAGAIN)) {
+        fprintf(stderr, "qemu_event_increment: write() filed: %s\n",
+                strerror(errno));
+        exit (1);
+    }
 }

 static void qemu_event_read(void *opaque)
@@ -5594,7 +5600,9 @@ int main(int argc, char **argv, char **envp)
 #ifndef _WIN32
         if (daemonize) {
             uint8_t status = 1;
-            write(fds[1], &status, 1);
+            if (write(fds[1], &status, 1) != 1) {
+                perror("daemonize. Writing to pipe\n");
+            }
         } else
 #endif
             fprintf(stderr, "Could not acquire pid file: %s\n", 
strerror(errno));
@@ -5893,7 +5901,10 @@ int main(int argc, char **argv, char **envp)
        if (len != 1)
            exit(1);

-       chdir("/");
+        if (chdir("/")) {
+            perror("not able to chdir to /");
+            exit(1);
+        }
        TFR(fd = qemu_open("/dev/null", O_RDWR));
        if (fd == -1)
            exit(1);
@@ -5912,7 +5923,10 @@ int main(int argc, char **argv, char **envp)
             fprintf(stderr, "chroot failed\n");
             exit(1);
         }
-        chdir("/");
+        if (chdir("/")) {
+            perror("not able to chdir to /");
+            exit(1);
+        }
     }

     if (run_as) {
-- 
1.6.6