diff options
| -rw-r--r-- | toolbox/umount.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/toolbox/umount.c b/toolbox/umount.c index 6eb8b92..890e870 100644 --- a/toolbox/umount.c +++ b/toolbox/umount.c @@ -6,6 +6,7 @@ #include <string.h> #include <unistd.h> #include <linux/loop.h> +#include <errno.h> #define LOOPDEV_MAXLEN 64 #define LOOP_MAJOR 7 @@ -36,7 +37,7 @@ static int is_loop_mount(const char* path, char *loopdev) f = fopen("/proc/mounts", "r"); if (!f) { - fprintf(stdout, "could not open /proc/mounts\n"); + fprintf(stdout, "could not open /proc/mounts: %s\n", strerror(errno)); return -1; } @@ -66,8 +67,8 @@ int umount_main(int argc, char *argv[]) } loop = is_loop_mount(argv[1], loopdev); - if(umount(argv[1])){ - fprintf(stderr,"failed.\n"); + if (umount(argv[1])) { + fprintf(stderr, "failed: %s\n", strerror(errno)); return 1; } @@ -75,11 +76,11 @@ int umount_main(int argc, char *argv[]) // free the loop device loop_fd = open(loopdev, O_RDONLY); if (loop_fd < 0) { - perror("open loop device failed"); + fprintf(stderr, "open loop device failed: %s\n", strerror(errno)); return 1; } if (ioctl(loop_fd, LOOP_CLR_FD, 0) < 0) { - perror("ioctl LOOP_CLR_FD failed"); + fprintf(stderr, "ioctl LOOP_CLR_FD failed: %s\n", strerror(errno)); return 1; } |