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handle typical permission denied error in user friendly way 

This is the first (and the only) error that will occur if user will
try to access /dev/nbd0 without proper permissions.
This commit is contained in:
Vladimir Rutsky 2016-02-01 00:08:43 +03:00
parent 491f7ba326
commit 0b2d3e5052
1 changed files with 7 additions and 1 deletions
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8
buse.c
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@ -94,7 +94,13 @@ int buse_main(const char* dev_file, const struct buse_operations *aop, void *use
assert(!socketpair(AF_UNIX, SOCK_STREAM, 0, sp));
nbd = open(dev_file, O_RDWR);
assert(nbd != -1);
if (nbd == -1) {
fprintf(stderr,
"Failed to open `%s': %s\n"
"Is kernel module `nbd' is loaded and you have permissions "
"to access the device?\n", dev_file, strerror(errno));
return 1;
}
assert(ioctl(nbd, NBD_SET_SIZE, aop->size) != -1);
assert(ioctl(nbd, NBD_CLEAR_SOCK) != -1);