check return value to avoid gcc warning

git-svn-id: svn://svn.lighttpd.net/xcache/trunk@767 c26eb9a1-5813-0410-bd6c-c2e55f420ca7

coverager.c

@@ -171,9 +171,13 @@ static void xc_coverager_save_cov(char *srcfile, char *outfilename, coverager_t
 	p[0] = 0;
 	p[1] = covlines;
 
-	ftruncate(fd, 0);
+	if (ftruncate(fd, 0) != 0) {
+		goto bailout;
+	}
 	lseek(fd, 0, SEEK_SET);
-	write(fd, (char *) buf, size);
+	if (write(fd, (char *) buf, size) != size) {
+		goto bailout;
+	}
 
 bailout:
 	if (contents) efree(contents);

mmap.c

@@ -186,7 +186,12 @@ static XC_SHM_INIT(xc_mmap_init) /* {{{ */
 			goto err;
 		}
 	}
-	ftruncate(fd, size);
+
+	if (ftruncate(fd, size) != 0) {
+		perror(shm->name);
+		errstr = "Failed to ftruncate the file";
+		goto err;
+	}
 #endif
 
 #ifdef ZEND_WIN32

xcache.c

@@ -3155,7 +3155,10 @@ static void xcache_signal_handler(int sig) /* {{{ */
 {
 	xcache_restore_signal_handler();
 	if (xc_coredump_dir && xc_coredump_dir[0]) {
-		chdir(xc_coredump_dir);
+		if (chdir(xc_coredump_dir) != 0) {
+			/* error, but nothing can do about it
+			 * and should'nt print anything which might SEGV again */
+		}
 	}
 	raise(sig);
 }