conf: change some logs to print errno

Signed-off-by: Donghwa Jeong <dh48.jeong@samsung.com>

diff --git a/src/lxc/conf.c b/src/lxc/conf.c
index 48cd7f8b3ef3049e1839de88575f55a059a3d8c3..87674541f5b66339d4b0e576d5bc01df6dd816ef 100644 (file)
--- a/src/lxc/conf.c
+++ b/src/lxc/conf.c
@@ -3186,25 +3186,27 @@ void remount_all_slave(void)
        char *line = NULL;
 
        mntinfo_fd = open("/proc/self/mountinfo", O_RDONLY | O_CLOEXEC);
-       if (mntinfo_fd < 0)
+       if (mntinfo_fd < 0) {
+               SYSERROR("Failed to open \"/proc/self/mountinfo\"");
                return;
+       }
 
        memfd = memfd_create(".lxc_mountinfo", MFD_CLOEXEC);
        if (memfd < 0) {
                char template[] = P_tmpdir "/.lxc_mountinfo_XXXXXX";
 
                if (errno != ENOSYS) {
+                       SYSERROR("Failed to create temporary in-memory file");
                        close(mntinfo_fd);
-                       WARN("Failed to create temporary in-memory file");
                        return;
                }
 
                memfd = lxc_make_tmpfile(template, true);
-       }
-       if (memfd < 0) {
-               close(mntinfo_fd);
-               WARN("Failed to create temporary file");
-               return;
+               if (memfd < 0) {
+                       close(mntinfo_fd);
+                       WARN("Failed to create temporary file");
+                       return;
+               }
        }
 
 #define __LXC_SENDFILE_MAX 0x7ffff000 /* maximum number of bytes sendfile can handle */
@@ -3214,9 +3216,9 @@ again:
                if (errno == EINTR)
                        goto again;
 
+               SYSERROR("Failed to copy \"/proc/self/mountinfo\"");
                close(mntinfo_fd);
                close(memfd);
-               WARN("Failed to copy \"/proc/self/mountinfo\"");
                return;
        }
        close(mntinfo_fd);
@@ -3226,15 +3228,15 @@ again:
         */
        ret = lseek(memfd, 0, SEEK_SET);
        if (ret < 0) {
+               SYSERROR("Failed to reset file descriptor offset");
                close(memfd);
-               WARN("%s - Failed to reset file descriptor offset", strerror(errno));
                return;
        }
 
        f = fdopen(memfd, "r");
        if (!f) {
-               WARN("Failed to open copy of \"/proc/self/mountinfo\" to mark "
-                    "all shared. Continuing");
+               SYSERROR("Failed to open copy of \"/proc/self/mountinfo\" to mark "
+                               "all shared. Continuing");
                close(memfd);
                return;
        }