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Show why umount failed.

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Change-Id: Id2b3fbc46b8dfbe2f05637fb35c298915cd5f524
This commit is contained in:
Jeff Brown 2011-07-13 22:12:18 -07:00
parent e877ad7ae3
commit baf6b6bdeb
1 changed files with 6 additions and 5 deletions
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11
toolbox/umount.c
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@ -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;
}