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glibc/hurd/get-host.c
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/* Get a host configuration item kept as the whole contents of a file. | |
Copyright (C) 1996-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <fcntl.h> | |
#include <hurd.h> | |
#include <hurd/lookup.h> | |
#include "hurdhost.h" | |
#include <string.h> | |
ssize_t | |
_hurd_get_host_config (const char *item, char *buf, size_t buflen) | |
{ | |
error_t err; | |
char *data; | |
mach_msg_type_number_t nread, more; | |
file_t config; | |
err = __hurd_file_name_lookup (&_hurd_ports_use, &__getdport, 0, | |
item, O_RDONLY, 0, &config); | |
switch (err) | |
{ | |
case 0: /* Success; read file contents below. */ | |
break; | |
case ENOENT: /* ? Others? All errors? */ | |
/* The file does not exist, so no value has been set. Rather than | |
causing gethostname et al to fail with ENOENT, give an empty value | |
as other systems do before sethostname has been called. */ | |
if (buflen != 0) | |
*buf = '\0'; | |
return 0; | |
default: | |
return __hurd_fail (err); | |
} | |
data = buf; | |
nread = buflen; | |
err = __io_read (config, &data, &nread, -1, buflen); | |
if (! err) | |
/* Check if there is more in the file we didn't read. */ | |
err = __io_readable (config, &more); | |
__mach_port_deallocate (__mach_task_self (), config); | |
if (err) | |
return __hurd_fail (err); | |
if (data != buf) | |
{ | |
memcpy (buf, data, nread); | |
__vm_deallocate (__mach_task_self (), (vm_address_t) data, nread); | |
} | |
/* If the file is empty, give an empty value. */ | |
if (nread == 0) | |
{ | |
if (buflen != 0) | |
*buf = '\0'; | |
return 0; | |
} | |
/* Remove newlines in case someone wrote the file by hand. */ | |
while (nread > 0 && buf[nread - 1] == '\n') | |
buf[--nread] = '\0'; | |
/* Null-terminate the result if there is enough space. */ | |
if (nread < buflen) | |
buf[nread] = '\0'; | |
else | |
if (buf[nread - 1] != '\0') | |
more = 1; | |
if (more) | |
/* If we didn't read the whole file, tell the caller to use a bigger | |
buffer next time. */ | |
return __hurd_fail (ENAMETOOLONG); | |
return nread; | |
} |