diff options
| -rw-r--r-- | trans/null.c | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/trans/null.c b/trans/null.c index 2729a639..ecec5c94 100644 --- a/trans/null.c +++ b/trans/null.c @@ -34,13 +34,37 @@ const char *argp_program_version = STANDARD_HURD_VERSION (null); +/* Error code to return for write attempts. + If zero, they succeed in writing to the bitbucket. */ +static error_t write_error_code; + +static const struct argp_option options[] = +{ + {"full", 'f', 0, 0, "Cause writes to fail as if to a full disk"}, + {0} +}; + +static error_t +parse_opt (int opt, char *arg, struct argp_state *state) +{ + switch (opt) + { + case 'f': + write_error_code = ENOSPC; + return 0; + } + return ARGP_ERR_UNKNOWN; +} + +static const struct argp argp = +{ options, parse_opt, 0, "Endless sink and null source" }; + int main (int argc, char **argv) { error_t err; mach_port_t bootstrap; struct trivfs_control *fsys; - const struct argp argp = { 0, 0, 0, "Endless sink and null source" }; argp_parse (&argp, argc, argv, 0, 0, 0); @@ -197,7 +221,7 @@ trivfs_S_io_write (struct trivfs_protid *cred, else if (!(cred->po->openmodes & O_WRITE)) return EBADF; *amt = datalen; - return 0; + return write_error_code; } /* Truncate file. */ |