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/* Selective.c provide access to timeval and select.
Copyright (C) 2005-2025 Free Software Foundation, Inc.
Contributed by Gaius Mulley <gaius@glam.ac.uk>.
This file is part of GNU Modula-2.
GNU Modula-2 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, or (at your option)
any later version.
GNU Modula-2 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.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "ansidecl.h"
#include "gm2-libs-host.h"
#ifdef __cplusplus
extern "C" {
#endif
#if defined(HAVE_SELECT)
# define FDSET_T fd_set
#else
# define FDSET_T void
#endif
#if defined(HAVE_SELECT)
int Selective_Select (int nooffds,
fd_set *readfds,
fd_set *writefds,
fd_set *exceptfds,
struct timeval *timeout)
{
return select (nooffds, readfds, writefds, exceptfds, timeout);
}
#else
int Selective_Select (int nooffds,
void *readfds,
void *writefds,
void *exceptfds,
void *timeout)
{
return 0;
}
#endif
/* InitTime initialises a timeval structure and returns a pointer to it. */
#if defined(HAVE_SELECT)
struct timeval *Selective_InitTime (unsigned int sec, unsigned int usec)
{
struct timeval *t = (struct timeval *) malloc (sizeof (struct timeval));
t->tv_sec = (long int) sec;
t->tv_usec = (long int) usec;
return t;
}
void Selective_GetTime (struct timeval *t,
unsigned int *sec, unsigned int *usec)
{
*sec = (unsigned int) t->tv_sec;
*usec = (unsigned int) t->tv_usec;
}
void Selective_SetTime (struct timeval *t,
unsigned int sec, unsigned int usec)
{
t->tv_sec = sec;
t->tv_usec = usec;
}
/* KillTime frees the timeval structure and returns NULL. */
struct timeval *Selective_KillTime (struct timeval *t)
{
free (t);
return NULL;
}
/* InitSet returns a pointer to a FD_SET. */
fd_set *Selective_InitSet (void)
{
fd_set *s = (fd_set *) malloc (sizeof (fd_set));
return s;
}
/* KillSet frees the FD_SET and returns NULL. */
fd_set *Selective_KillSet (fd_set *s)
{
free (s);
return NULL;
}
/* FdZero generate an empty set. */
void Selective_FdZero (fd_set *s)
{
FD_ZERO (s);
}
/* FS_Set include an element, fd, into set, s. */
void Selective_FdSet (int fd, fd_set *s)
{
FD_SET (fd, s);
}
/* FdClr exclude an element, fd, from the set, s. */
void Selective_FdClr (int fd, fd_set *s)
{
FD_CLR (fd, s);
}
/* FdIsSet return TRUE if, fd, is present in set, s. */
int Selective_FdIsSet (int fd, fd_set *s)
{
return FD_ISSET (fd, s);
}
/* GetTimeOfDay fills in a record, Timeval, filled in with the
current system time in seconds and microseconds.
It returns zero (see man 3p gettimeofday). */
int Selective_GetTimeOfDay (struct timeval *t)
{
return gettimeofday (t, NULL);
}
#else
void *Selective_InitTime (unsigned int sec, unsigned int usec)
{
return NULL;
}
void *Selective_KillTime (void *t)
{
return NULL;
}
void Selective_GetTime (struct timeval *t,
unsigned int *sec, unsigned int *usec)
{
}
void Selective_SetTime (struct timeval *t,
unsigned int sec, unsigned int usec)
{
}
fd_set *Selective_InitSet (void)
{
return NULL;
}
void Selective_FdZero (void *s)
{
}
void Selective_FdSet (int fd, void *s)
{
}
void Selective_FdClr (int fd, void *s)
{
}
int Selective_FdIsSet (int fd, void *s)
{
return 0;
}
int Selective_GetTimeOfDay (struct timeval *t)
{
return -1;
}
#endif
/* MaxFdsPlusOne returns max (a + 1, b + 1). */
int Selective_MaxFdsPlusOne (int a, int b)
{
if (a > b)
return a+1;
else
return b+1;
}
/* WriteCharRaw writes a single character to the file descriptor. */
void Selective_WriteCharRaw (int fd, char ch)
{
write (fd, &ch, 1);
}
/* ReadCharRaw read and return a single char from file descriptor, fd. */
char Selective_ReadCharRaw (int fd)
{
char ch;
read (fd, &ch, 1);
return ch;
}
void
_M2_Selective_init ()
{
}
void
_M2_Selective_finish ()
{
}
#ifdef __cplusplus
}
#endif
|
