tests: fix potential errno clobbering in netlink_kobject_uevent.test

* tests/netlink_kobject_uevent.c (errstr): New variable.
(sys_send): New function.
(main): Use them.

diff --git a/tests/netlink_kobject_uevent.c b/tests/netlink_kobject_uevent.c
index cacab5fd68d4b9a1b3559d2736fca81730e56645..5b98061290428470424360a5aac125d2ec835fc4 100644 (file)
--- a/tests/netlink_kobject_uevent.c
+++ b/tests/netlink_kobject_uevent.c
@@ -31,12 +31,21 @@
 #include <sys/socket.h>
 #include "netlink.h"
 
+static const char *errstr;
+
+static ssize_t
+sys_send(const int fd, const void *const buf, const size_t len)
+{
+       const ssize_t rc = sendto(fd, buf, len, MSG_DONTWAIT, NULL, 0);
+       errstr = sprintrc(rc);
+       return rc;
+}
+
 int
 main(void)
 {
        skip_if_unavailable("/proc/self/fd/");
 
-       long rc;
        int fd = create_nl_socket(NETLINK_KOBJECT_UEVENT);
 
        /* test using data that looks like a zero-length C string */
@@ -44,17 +53,17 @@ main(void)
        buf[0] = '=';
        fill_memory_ex(buf + 1, DEFAULT_STRLEN, 0, DEFAULT_STRLEN);
 
-       rc = sendto(fd, buf + 1, DEFAULT_STRLEN, MSG_DONTWAIT, NULL, 0);
+       sys_send(fd, buf + 1, DEFAULT_STRLEN);
        printf("sendto(%d, ", fd);
        print_quoted_memory(buf + 1, DEFAULT_STRLEN);
        printf(", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
-              DEFAULT_STRLEN, sprintrc(rc));
+              DEFAULT_STRLEN, errstr);
 
-       rc = sendto(fd, buf, DEFAULT_STRLEN + 1, MSG_DONTWAIT, NULL, 0);
+       sys_send(fd, buf, DEFAULT_STRLEN + 1);
        printf("sendto(%d, ", fd);
        print_quoted_memory(buf, DEFAULT_STRLEN);
        printf("..., %u, MSG_DONTWAIT, NULL, 0) = %s\n",
-              DEFAULT_STRLEN + 1, sprintrc(rc));
+              DEFAULT_STRLEN + 1, errstr);
 
        puts("+++ exited with 0 +++");
        return 0;