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