Use strerror(errno) instead of %m

Better for portability and consistency. Currently strerror() is used
everywhere else, so use it here as well. printf's %m is a glibc
extension that is supported also by some other libc implementations.

Signed-off-by: Tomi Leppänen <tomi.leppanen@jolla.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/firejail/sandbox.c b/src/firejail/sandbox.c
index a04551ed4..a97ca0abb 100644
--- a/src/firejail/sandbox.c
+++ b/src/firejail/sandbox.c
@@ -975,10 +975,10 @@ int sandbox(void* sandbox_arg) {
                         fs_private_dir_copy("/usr/etc", RUN_USR_ETC_DIR, cfg.etc_private_keep); // openSUSE
 
                         if (umount2("/etc/group", MNT_DETACH) == -1)
-                                fprintf(stderr, "/etc/group: unmount: %m\n");
+                                fprintf(stderr, "/etc/group: unmount: %s\n", strerror(errno));
 
                         if (umount2("/etc/passwd", MNT_DETACH) == -1)
-                                fprintf(stderr, "/etc/passwd: unmount: %m\n");
+                                fprintf(stderr, "/etc/passwd: unmount: %s\n", strerror(errno));
 
                         fs_private_dir_mount("/etc", RUN_ETC_DIR);
                         fs_private_dir_mount("/usr/etc", RUN_USR_ETC_DIR);