mirror of git://gcc.gnu.org/git/gcc.git
326 lines
6.0 KiB
C++
326 lines
6.0 KiB
C++
/* Selective.c provide access to timeval and select.
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Copyright (C) 2009-2022 Free Software Foundation, Inc.
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Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.
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This file is part of GNU Modula-2.
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GNU Modula-2 is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GNU Modula-2 is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include <config.h>
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#include <m2rts.h>
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#define EXPORT(FUNC) m2pim ## _Selective_ ## FUNC
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#define M2EXPORT(FUNC) m2pim ## _M2_Selective_ ## FUNC
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#define M2LIBNAME "m2pim"
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#if defined(HAVE_STDDEF_H)
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/* Obtain a definition for NULL. */
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#include <stddef.h>
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#endif
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#if defined(HAVE_STDIO_H)
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/* Obtain a definition for NULL. */
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#include <stdio.h>
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#endif
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#if defined(HAVE_SYS_TIME_H)
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#include <sys/time.h>
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#endif
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#if defined(HAVE_TIME_H)
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/* Obtain a definition for NULL. */
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#include <time.h>
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#endif
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#if defined(HAVE_STRING_H)
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/* Obtain a definition for NULL. */
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#include <string.h>
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#endif
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#if defined(HAVE_WCHAR_H)
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/* Obtain a definition for NULL. */
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#include <wchar.h>
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#endif
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#if defined(HAVE_STDLIB_H)
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/* Obtain a prototype for free and malloc. */
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#include <stdlib.h>
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#endif
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#if defined(HAVE_SYS_TYPES_H)
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#include <sys/types.h>
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#endif
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#if defined(HAVE_UNISTD_H)
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#include <unistd.h>
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#endif
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#if !defined(NULL)
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#define NULL (void *)0
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#endif
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#if defined(HAVE_SELECT)
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#define FDSET_T fd_set
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#else
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#define FDSET_T void
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#endif
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/* Select wrap a call to the C select. */
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#if defined(HAVE_STRUCT_TIMEVAL)
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extern "C" int
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EXPORT(Select) (int nooffds, fd_set *readfds, fd_set *writefds,
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fd_set *exceptfds, struct timeval *timeout)
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{
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return select (nooffds, readfds, writefds, exceptfds, timeout);
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}
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#else
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extern "C" int
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EXPORT(Select) (int nooffds, void *readfds, void *writefds, void *exceptfds,
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void *timeout)
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{
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return 0;
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}
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#endif
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/* InitTime initializes a timeval structure and returns a pointer to it. */
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#if defined(HAVE_STRUCT_TIMEVAL)
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extern "C" struct timeval *
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EXPORT(InitTime) (unsigned int sec, unsigned int usec)
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{
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struct timeval *t = (struct timeval *)malloc (sizeof (struct timeval));
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t->tv_sec = (long int)sec;
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t->tv_usec = (long int)usec;
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return t;
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}
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extern "C" void
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EXPORT(GetTime) (struct timeval *t, unsigned int *sec, unsigned int *usec)
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{
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*sec = (unsigned int)t->tv_sec;
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*usec = (unsigned int)t->tv_usec;
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}
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extern "C" void
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EXPORT(SetTime) (struct timeval *t, unsigned int sec, unsigned int usec)
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{
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t->tv_sec = sec;
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t->tv_usec = usec;
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}
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/* KillTime frees the timeval structure and returns NULL. */
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extern "C" struct timeval *
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EXPORT(KillTime) (struct timeval *t)
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{
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#if defined(HAVE_STDLIB_H)
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free (t);
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#endif
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return NULL;
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}
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/* InitSet returns a pointer to a FD_SET. */
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extern "C" FDSET_T *
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EXPORT(InitSet) (void)
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{
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#if defined(HAVE_STDLIB_H)
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FDSET_T *s = (FDSET_T *)malloc (sizeof (FDSET_T));
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return s;
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#else
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return NULL
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#endif
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}
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/* KillSet frees the FD_SET and returns NULL. */
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extern "C" FDSET_T *
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EXPORT(KillSet) (FDSET_T *s)
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{
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#if defined(HAVE_STDLIB_H)
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free (s);
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#endif
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return NULL;
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}
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/* FdZero generate an empty set. */
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extern "C" void
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EXPORT(FdZero) (FDSET_T *s)
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{
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FD_ZERO (s);
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}
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/* FS_Set include an element, fd, into set, s. */
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extern "C" void
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EXPORT(FdSet) (int fd, FDSET_T *s)
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{
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FD_SET (fd, s);
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}
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/* FdClr exclude an element, fd, from the set, s. */
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extern "C" void
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EXPORT(FdClr) (int fd, FDSET_T *s)
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{
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FD_CLR (fd, s);
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}
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/* FdIsSet return TRUE if, fd, is present in set, s. */
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extern "C" int
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EXPORT(FdIsSet) (int fd, FDSET_T *s)
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{
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return FD_ISSET (fd, s);
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}
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/* GetTimeOfDay fills in a record, Timeval, filled in with the
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current system time in seconds and microseconds.
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It returns zero (see man 3p gettimeofday). */
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extern "C" int
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EXPORT(GetTimeOfDay) (struct timeval *t)
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{
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return gettimeofday (t, NULL);
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}
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#else
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extern "C" void *
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EXPORT(InitTime) (unsigned int sec, unsigned int usec)
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{
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return NULL;
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}
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extern "C" void *
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EXPORT(KillTime) (void *t)
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{
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return NULL;
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}
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extern "C" void
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EXPORT(GetTime) (void *t, unsigned int *sec, unsigned int *usec)
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{
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}
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extern "C" void
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EXPORT(SetTime) (void *t, unsigned int sec, unsigned int usec)
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{
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}
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extern "C" FDSET_T *
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EXPORT(InitSet) (void)
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{
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return NULL;
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}
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extern "C" FDSET_T *
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EXPORT(KillSet) (void)
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{
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return NULL;
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}
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extern "C" void
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EXPORT(FdZero) (void *s)
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{
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}
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extern "C" void
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EXPORT(FdSet) (int fd, void *s)
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{
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}
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extern "C" void
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EXPORT(FdClr) (int fd, void *s)
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{
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}
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extern "C" int
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EXPORT(FdIsSet) (int fd, void *s)
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{
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return 0;
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}
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extern "C" int
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EXPORT(GetTimeOfDay) (void *t)
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{
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return -1;
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}
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#endif
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/* MaxFdsPlusOne returns max (a + 1, b + 1). */
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extern "C" int
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EXPORT(MaxFdsPlusOne) (int a, int b)
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{
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if (a > b)
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return a + 1;
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else
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return b + 1;
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}
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/* WriteCharRaw writes a single character to the file descriptor. */
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extern "C" void
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EXPORT(WriteCharRaw) (int fd, char ch)
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{
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write (fd, &ch, 1);
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}
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/* ReadCharRaw read and return a single char from file descriptor, fd. */
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extern "C" char
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EXPORT(ReadCharRaw) (int fd)
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{
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char ch;
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read (fd, &ch, 1);
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return ch;
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}
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/* GNU Modula-2 linking hooks. */
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extern "C" void
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M2EXPORT(init) (int, char **, char **)
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{
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}
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extern "C" void
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M2EXPORT(fini) (int, char **, char **)
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{
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}
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extern "C" void
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M2EXPORT(dep) (void)
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{
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}
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extern "C" void __attribute__((__constructor__))
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M2EXPORT(ctor) (void)
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{
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m2pim_M2RTS_RegisterModule ("Selective", M2LIBNAME,
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M2EXPORT(init), M2EXPORT(fini),
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M2EXPORT(dep));
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}
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