Fix the compiler's warnings in make test with glibc

test/client/main.c

@@ -1,3 +1,4 @@
+#define _GNU_SOURCE
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -94,16 +95,11 @@ int client_sendmsg(int server_fd, char *buf) {
 
 #ifdef __GLIBC__
 
-struct mmsghdr {
-    struct msghdr msg;
-    unsigned int len;
-};
-
 int client_sendmmsg(int server_fd, char *buf) {
     int ret = 0;
     struct mmsghdr msg_v[2] = {};
     struct iovec iov[1];
-    struct msghdr *msg_ptr = &msg_v[0].msg;
+    struct msghdr *msg_ptr = &msg_v[0].msg_hdr;
 
     // Set msg0
     msg_ptr->msg_name = NULL;
@@ -118,14 +114,15 @@ int client_sendmmsg(int server_fd, char *buf) {
 
     // Set msg1
     msg_v[1] = msg_v[0];
-    msg_ptr = &msg_v[1].msg;
+    msg_ptr = &msg_v[1].msg_hdr;
     msg_ptr->msg_iov = NULL;
     msg_ptr->msg_iovlen = 0;
 
     ret = sendmmsg(server_fd, msg_v,  2, 0);
-    if (ret != 2 || msg_v[0].len <= 0 || msg_v[1].len != 0) {
+    if (ret != 2 || msg_v[0].msg_len <= 0 || msg_v[1].msg_len != 0) {
         THROW_ERROR("sendmsg failed");
     }
+    return 0;
 }
 #endif
 

test/device/main.c

@@ -1,3 +1,4 @@
+#define _GNU_SOURCE
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <fcntl.h>
@@ -158,7 +159,9 @@ int test_dev_fd() {
     if (fd_str == NULL) {
         THROW_ERROR("calloc failed");
     }
-    asprintf(&fd_str, "%d", fd);
+    if (asprintf(&fd_str, "%d", fd) < 0) {
+        THROW_ERROR("failed to asprintf");
+    }
     strcat(dev_fd_path, fd_str);
     int dev_fd = open(dev_fd_path, O_WRONLY, 0666);
     if (dev_fd < 0) {

test/eventfd/Makefile

@@ -1,5 +1,5 @@
 include ../test_common.mk
 
-EXTRA_C_FLAGS := -Wno-incompatible-pointer-types-discards-qualifiers
+EXTRA_C_FLAGS := -Wno-incompatible-pointer-types-discards-qualifiers -Wno-unused-result
 EXTRA_LINK_FLAGS := -lpthread
 BIN_ARGS :=

test/exec/main.c

@@ -45,7 +45,8 @@ int test_execve_error_return(void) {
     }
 
     // during the time, try execve a non-exit process
-    int ret = execve("/bin/joke", NULL, NULL);
+    char *args[] = {"joke", NULL};
+    int ret = execve("/bin/joke", args, NULL);
     if (ret != -1 || errno != ENOENT) {
         THROW_ERROR("execve error code wrong");
     }

test/ioctl/main.c

@@ -1,3 +1,4 @@
+#define _GNU_SOURCE
 #include <net/if.h>
 #include <sys/socket.h>
 #include <sys/types.h>
@@ -5,7 +6,6 @@
 #include <sys/stat.h>
 #include <errno.h>
 #include <fcntl.h>
-#define _GNU_SOURCE
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -547,9 +547,11 @@ int test_ioctl_FIOCLEX(void) {
     child_argv[0] = strdup("naughty_child");
     child_argv[1] = strdup("-t");
     child_argv[2] = strdup("fioclex");
-    asprintf(&child_argv[3], "%d", fd);
+    if (asprintf(&child_argv[3], "%d", fd) < 0 ||
-    asprintf(&child_argv[4], "%d", pipefds[0]);
+            asprintf(&child_argv[4], "%d", pipefds[0]) < 0 ||
-    asprintf(&child_argv[5], "%d", pipefds[1]);
+            asprintf(&child_argv[5], "%d", pipefds[1]) < 0) {
+        THROW_ERROR("failed to call asprintf");
+    }
 
     ret = posix_spawn(&child_pid, "/bin/naughty_child", NULL, NULL, child_argv, NULL);
     if (ret != 0) {

test/resolv_conf/main.c

@@ -12,10 +12,15 @@ char *read_resolv_conf(void) {
     fseek(fp, 0, SEEK_SET);
     char *resolv_conf_buffer = malloc(fsize + 1);
     if (resolv_conf_buffer == NULL) {
-        printf("ERROR: Failed to malloc for /etc/resolv.conf buffer");
+        printf("ERROR: Failed to malloc for /etc/resolv.conf buffer\n");
+        return NULL;
+    }
+    size_t len = fread(resolv_conf_buffer, 1, fsize, fp);
+    if (len != fsize) {
+        printf("ERROR: failed to fread correct len\n");
+        fclose(fp);
         return NULL;
     }
-    fread(resolv_conf_buffer, 1, fsize, fp);
     fclose(fp);
     return resolv_conf_buffer;
 }

test/server/main.c

@@ -381,7 +381,7 @@ int test_poll() {
         char buf[512];
         if ((count = read(client_fd, buf, sizeof buf)) != 0) {
             if (strcmp(buf, DEFAULT_MSG) != 0) {
-                printf(buf);
+                printf("%s", buf);
                 THROW_ERROR("msg mismatched");
             }
         } else {

test/unix_socket/main.c

@@ -160,8 +160,8 @@ int verify_child_echo(int *connected_sockets) {
     }
 
     char actual_str[32] = {0};
-    read(connected_sockets[1], actual_str, 32);
+    ssize_t len = read(connected_sockets[1], actual_str, 32);
-    if (strncmp(actual_str, ECHO_MSG, sizeof(ECHO_MSG) - 1) != 0) {
+    if (len != sizeof(ECHO_MSG) || strncmp(actual_str, ECHO_MSG, strlen(ECHO_MSG)) != 0) {
         printf("data read is :%s\n", actual_str);
         THROW_ERROR("received string is not as expected");
     }
@@ -269,7 +269,9 @@ int test_poll() {
         THROW_ERROR("socketpair failed");
     }
 
-    write(socks[0], "not today\n", 10);
+    if (write(socks[0], "not today\n", 10) < 0) {
+        THROW_ERROR("failed to write to socket");
+    }
 
     struct pollfd polls[] = {
         { .fd = socks[0], .events = POLLOUT },
@@ -358,8 +360,8 @@ int test_ioctl_fionread() {
     }
 
     char actual_str[32] = {0};
-    read(sockets[1], actual_str, 32);
+    ssize_t len = read(sockets[1], actual_str, 32);
-    if (strncmp(actual_str, ECHO_MSG, sizeof(ECHO_MSG) - 1) != 0) {
+    if (len != sizeof(ECHO_MSG) || strncmp(actual_str, ECHO_MSG, strlen(ECHO_MSG)) != 0) {
         printf("data read is :%s\n", actual_str);
         THROW_ERROR("received string is not as expected");
     }