Merge pull request #7 from rutsky/verbose-messages
handle errors in verbose user friendly way
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commit
5192bb933b
8
buse.c
8
buse.c
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@ -95,7 +95,13 @@ int buse_main(const char* dev_file, const struct buse_operations *aop, void *use
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assert(!err);
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assert(!err);
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nbd = open(dev_file, O_RDWR);
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nbd = open(dev_file, O_RDWR);
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assert(nbd != -1);
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if (nbd == -1) {
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fprintf(stderr,
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"Failed to open `%s': %s\n"
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"Is kernel module `nbd' is loaded and you have permissions "
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"to access the device?\n", dev_file, strerror(errno));
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return 1;
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}
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err = ioctl(nbd, NBD_SET_SIZE, aop->size);
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err = ioctl(nbd, NBD_SET_SIZE, aop->size);
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assert(err != -1);
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assert(err != -1);
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11
busexmp.c
11
busexmp.c
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@ -74,7 +74,16 @@ static struct buse_operations aop = {
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int main(int argc, char *argv[])
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int main(int argc, char *argv[])
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{
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{
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(void)(argc);
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if (argc != 2)
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{
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fprintf(stderr,
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"Usage:\n"
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" %s /dev/nbd0\n"
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"Don't forget to load nbd kernel module (`modprobe nbd`) and\n"
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"run example from root.\n", argv[0]);
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return 1;
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}
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data = malloc(aop.size);
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data = malloc(aop.size);
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return buse_main(argv[1], &aop, (void *)&xmpl_debug);
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return buse_main(argv[1], &aop, (void *)&xmpl_debug);
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