mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-25 22:40:05 +00:00
93 lines
2.7 KiB
C
93 lines
2.7 KiB
C
/* Get a host configuration item kept as the whole contents of a file.
|
|
Copyright (C) 1996-2020 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
|
|
<https://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 && more == 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 (nread != 0 && 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;
|
|
}
|