112 lines
2.9 KiB
C
112 lines
2.9 KiB
C
/***********************************************************************/
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/* */
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/* Caml Special Light */
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/* */
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/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
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/* */
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/* Copyright 1995 Institut National de Recherche en Informatique et */
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/* Automatique. Distributed only by permission. */
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/* */
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/***********************************************************************/
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/* $Id$ */
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#include <mlvalues.h>
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#include <alloc.h>
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#include <memory.h>
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#include "unix.h"
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#ifdef HAS_SELECT
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#include <sys/types.h>
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#include <sys/time.h>
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#ifdef FD_ISSET
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typedef fd_set file_descr_set;
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#else
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typedef int file_descr_set;
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#define FD_SETSIZE (sizeof(int) * 8)
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#define FD_SET(fd,fds) (*(fds) |= 1 << (fd))
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#define FD_CLR(fd,fds) (*(fds) &= ~(1 << (fd)))
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#define FD_ISSET(fd,fds) (*(fds) & (1 << (fd)))
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#define FD_ZERO(fds) (*(fds) = 0)
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#endif
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static void fdlist_to_fdset(fdlist, fdset)
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value fdlist;
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file_descr_set * fdset;
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{
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value l;
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FD_ZERO(fdset);
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for (l = fdlist; l != Val_int(0); l = Field(l, 1)) {
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FD_SET(Int_val(Field(l, 0)), fdset);
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}
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}
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static value fdset_to_fdlist(fdset)
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file_descr_set * fdset;
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{
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int i;
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Push_roots(roots, 1)
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#define res roots[0]
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res = Val_int(0);
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for (i = FD_SETSIZE - 1; i >= 0; i--) {
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if (FD_ISSET(i, fdset)) {
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value newres = alloc(2, 0);
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Field(newres, 0) = Val_int(i);
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Field(newres, 1) = res;
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res = newres;
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}
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}
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Pop_roots();
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return res;
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#undef res
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}
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value unix_select(readfds, writefds, exceptfds, timeout) /* ML */
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value readfds, writefds, exceptfds, timeout;
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{
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file_descr_set read, write, except;
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double tm;
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struct timeval tv;
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struct timeval * tvp;
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int retcode;
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value res;
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Push_roots(roots, 3)
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#define read_list roots[0]
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#define write_list roots[1]
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#define except_list roots[2]
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fdlist_to_fdset(readfds, &read);
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fdlist_to_fdset(writefds, &write);
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fdlist_to_fdset(exceptfds, &except);
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tm = Double_val(timeout);
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if (tm < 0.0)
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tvp = (struct timeval *) NULL;
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else {
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tv.tv_sec = (int) tm;
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tv.tv_usec = (int) (1e6 * (tm - (int) tm));
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tvp = &tv;
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}
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retcode = select(FD_SETSIZE, &read, &write, &except, tvp);
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if (retcode == -1) uerror("select", Nothing);
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read_list = fdset_to_fdlist(&read);
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write_list = fdset_to_fdlist(&write);
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except_list = fdset_to_fdlist(&except);
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res = alloc_tuple(3);
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Field(res, 0) = read_list;
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Field(res, 1) = write_list;
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Field(res, 2) = except_list;
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Pop_roots();
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return res;
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#undef read_list
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#undef write_list
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#undef except_list
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}
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#else
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value unix_select() { invalid_argument("select not implemented"); }
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#endif
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