[Qemu-devel] [PATCH 14/18] vl.c: fix warning with _FORTIFY_SOURCE

["Kirill A. Shutemov" <kirill@shutemov.name>]

  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 <kirill@shutemov.name>
---
 vl.c |   15 +++++++++++----
 1 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/vl.c b/vl.c
index e606903..60a2c5e 100644
--- a/vl.c
+++ b/vl.c
@@ -3383,7 +3383,11 @@ static void qemu_event_increment(void)
     if (io_thread_fd == -1)
         return;
 
-    write(io_thread_fd, &byte, sizeof(byte));
+    if (write(io_thread_fd, &byte, sizeof(byte)) != sizeof(byte)){
+        fprintf(stderr, "qemu_event_increment: write() filed: %s\n",
+                strerror(errno));
+        exit (1);
+    }
 }
 
 static void qemu_event_read(void *opaque)
@@ -5767,7 +5771,8 @@ 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("write()");
         } else
 #endif
             fprintf(stderr, "Could not acquire pid file: %s\n", strerror(errno));
@@ -6064,7 +6069,8 @@ int main(int argc, char **argv, char **envp)
 	if (len != 1)
 	    exit(1);
 
-	chdir("/");
+	if (chdir("/"))
+        exit(1);
 	TFR(fd = qemu_open("/dev/null", O_RDWR));
 	if (fd == -1)
 	    exit(1);
@@ -6083,7 +6089,8 @@ int main(int argc, char **argv, char **envp)
             fprintf(stderr, "chroot failed\n");
             exit(1);
         }
-        chdir("/");
+        if (chdir("/"))
+            exit(1);
     }
 
     if (run_as) {
-- 
1.6.5.6