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/*
Unix SMB/CIFS implementation.
Samba system utilities
Copyright (C) Andrew Tridgell 1992-1998
Copyright (C) Jeremy Allison 1998-2002
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "system/network.h"
#include "system/filesys.h"
/*
The idea is that this file will eventually have wrappers around all
important system calls in samba. The aims are:
- to enable easier porting by putting OS dependent stuff in here
- to allow for hooks into other "pseudo-filesystems"
- to allow easier integration of things like the japanese extensions
- to support the philosophy of Samba to expose the features of
the OS within the SMB model. In general whatever file/printer/variable
expansions/etc make sense to the OS should be acceptable to Samba.
*/
/**************************************************************************
A wrapper for gethostbyname() that tries avoids looking up hostnames
in the root domain, which can cause dial-on-demand links to come up for no
apparent reason.
****************************************************************************/
_PUBLIC_ struct hostent *sys_gethostbyname(const char *name)
{
#ifdef REDUCE_ROOT_DNS_LOOKUPS
char query[256], hostname[256];
char *domain;
/* Does this name have any dots in it? If so, make no change */
if (strchr(name, '.'))
return(gethostbyname(name));
/* Get my hostname, which should have domain name
attached. If not, just do the gethostname on the
original string.
*/
gethostname(hostname, sizeof(hostname) - 1);
hostname[sizeof(hostname) - 1] = 0;
if ((domain = strchr(hostname, '.')) == NULL)
return(gethostbyname(name));
/* Attach domain name to query and do modified query.
If names too large, just do gethostname on the
original string.
*/
if((strlen(name) + strlen(domain)) >= sizeof(query))
return(gethostbyname(name));
slprintf(query, sizeof(query)-1, "%s%s", name, domain);
return(gethostbyname(query));
#else /* REDUCE_ROOT_DNS_LOOKUPS */
return(gethostbyname(name));
#endif /* REDUCE_ROOT_DNS_LOOKUPS */
}
_PUBLIC_ struct in_addr sys_inet_makeaddr(int net, int host)
{
struct in_addr in;
struct in_addr in2;
in = inet_makeaddr(net, host);
in2.s_addr = in.s_addr;
return in2;
}
/**************************************************************************
Wrapper for fork. Ensures we clear our pid cache.
****************************************************************************/
static pid_t mypid = (pid_t)-1;
_PUBLIC_ pid_t sys_fork(void)
{
pid_t forkret = fork();
if (forkret == (pid_t)0) {
/* Child - reset mypid so sys_getpid does a system call. */
mypid = (pid_t) -1;
}
return forkret;
}
/**************************************************************************
Wrapper for getpid. Ensures we only do a system call *once*.
****************************************************************************/
_PUBLIC_ pid_t sys_getpid(void)
{
if (mypid == (pid_t)-1)
mypid = getpid();
return mypid;
}
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