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/* GSelective.c provides access to select for Modula-2.
Copyright (C) 2016-2025 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.
You should have received a copy of the GNU General Public License
along with GNU Modula-2; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
/* implementation module in C. */
#include "config.h"
#include "system.h"
#include "ansidecl.h"
#include "gm2-libs-host.h"
#if defined(__cplusplus)
#define EXTERN extern "C"
#else
#define EXTERN
#endif
/* PROCEDURE Select (nooffds: CARDINAL; readfds, writefds, exceptfds:
SetOfFd; timeout: Timeval) : INTEGER ; */
#if defined(HAVE_SELECT)
EXTERN
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
EXTERN
int
Selective_Select (int nooffds, void *readfds, void *writefds, void *exceptfds,
void *timeout)
{
return 0;
}
#endif
/* PROCEDURE InitTime (sec, usec) : Timeval ; */
#if defined(HAVE_SELECT)
EXTERN
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;
}
EXTERN
void
Selective_GetTime (struct timeval *t, unsigned int *sec, unsigned int *usec)
{
*sec = (unsigned int)t->tv_sec;
*usec = (unsigned int)t->tv_usec;
}
EXTERN
void
Selective_SetTime (struct timeval *t, unsigned int sec, unsigned int usec)
{
t->tv_sec = sec;
t->tv_usec = usec;
}
/* PROCEDURE KillTime (t: Timeval) : Timeval ; */
EXTERN
struct timeval *
Selective_KillTime (struct timeval *t)
{
free (t);
return NULL;
}
/* PROCEDURE InitSet () : SetOfFd ; */
EXTERN
fd_set *
Selective_InitSet (void)
{
fd_set *s = (fd_set *)malloc (sizeof (fd_set));
return s;
}
/* PROCEDURE KillSet (s: SetOfFd) : SetOfFd ; */
EXTERN
fd_set *
Selective_KillSet (fd_set *s)
{
free (s);
return NULL;
}
/* PROCEDURE FdZero (s: SetOfFd) ; */
EXTERN
void
Selective_FdZero (fd_set *s)
{
FD_ZERO (s);
}
/* PROCEDURE Fd_Set (fd: INTEGER; SetOfFd) ; */
EXTERN
void
Selective_FdSet (int fd, fd_set *s)
{
FD_SET (fd, s);
}
/* PROCEDURE FdClr (fd: INTEGER; SetOfFd) ; */
EXTERN
void
Selective_FdClr (int fd, fd_set *s)
{
FD_CLR (fd, s);
}
/* PROCEDURE FdIsSet (fd: INTEGER; SetOfFd) : BOOLEAN ; */
EXTERN
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) */
EXTERN
int
Selective_GetTimeOfDay (struct timeval *t)
{
return gettimeofday (t, NULL);
}
#else
EXTERN
void *
Selective_InitTime (unsigned int sec, unsigned int usec)
{
return NULL;
}
EXTERN
void *
Selective_KillTime (void *t)
{
return NULL;
}
EXTERN
void
Selective_GetTime (struct timeval *t, unsigned int *sec, unsigned int *usec)
{
}
EXTERN
void
Selective_SetTime (struct timeval *t, unsigned int sec, unsigned int usec)
{
}
EXTERN
fd_set *
Selective_InitSet (void)
{
return NULL;
}
EXTERN
void
Selective_FdZero (void *s)
{
}
EXTERN
void
Selective_FdSet (int fd, void *s)
{
}
EXTERN
void
Selective_FdClr (int fd, void *s)
{
}
EXTERN
int
Selective_FdIsSet (int fd, void *s)
{
return 0;
}
EXTERN
int
Selective_GetTimeOfDay (struct timeval *t)
{
return -1;
}
#endif
/* PROCEDURE MaxFdsPlusOne (a, b: File) : File ; */
EXTERN
int
Selective_MaxFdsPlusOne (int a, int b)
{
if (a > b)
return a + 1;
else
return b + 1;
}
/* PROCEDURE WriteCharRaw (fd: INTEGER; ch: CHAR) ; */
EXTERN
void
Selective_WriteCharRaw (int fd, char ch)
{
write (fd, &ch, 1);
}
/* PROCEDURE ReadCharRaw (fd: INTEGER) : CHAR ; */
EXTERN
char
Selective_ReadCharRaw (int fd)
{
char ch;
read (fd, &ch, 1);
return ch;
}
EXTERN
void
_M2_Selective_init ()
{
}
EXTERN
void
_M2_Selective_finish ()
{
}
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