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Show why umount failed.

Change-Id: Id2b3fbc46b8dfbe2f05637fb35c298915cd5f524
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1 parent e877ad7 commit baf6b6bdebd6e91c401f64e8013fed49697ed2cc @j9brown j9brown committed Jul 14, 2011
Showing with 6 additions and 5 deletions.
  1. +6 −5 toolbox/umount.c
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11 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;
}
@@ -66,20 +67,20 @@ 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;
}
if (loop) {
// 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;
}

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