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/***********************************************************************/
/* */
/* OCaml */
/* */
/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
/* */
/* Copyright 1996 Institut National de Recherche en Informatique et */
/* en Automatique. All rights reserved. This file is distributed */
/* under the terms of the GNU Library General Public License, with */
/* the special exception on linking described in file ../../LICENSE. */
/* */
/***********************************************************************/
/* $Id$ */
#include <mlvalues.h>
#include <alloc.h>
#include <fail.h>
#include <memory.h>
#include <signals.h>
#include "unixsupport.h"
#ifdef HAS_SELECT
#include <sys/types.h>
#include <sys/time.h>
#ifdef HAS_SYS_SELECT_H
#include <sys/select.h>
#endif
#include <string.h>
#include <unistd.h>
#include <errno.h>
static int fdlist_to_fdset(value fdlist, fd_set *fdset, int *maxfd)
{
value l;
FD_ZERO(fdset);
for (l = fdlist; l != Val_int(0); l = Field(l, 1)) {
long fd = Long_val(Field(l, 0));
/* PR#5563: harden against bad fds */
if (fd < 0 || fd >= FD_SETSIZE) return -1;
FD_SET((int) fd, fdset);
if (fd > *maxfd) *maxfd = fd;
}
return 0;
}
static value fdset_to_fdlist(value fdlist, fd_set *fdset)
{
value l;
value res = Val_int(0);
Begin_roots2(l, res);
for (l = fdlist; l != Val_int(0); l = Field(l, 1)) {
int fd = Int_val(Field(l, 0));
if (FD_ISSET(fd, fdset)) {
value newres = alloc_small(2, 0);
Field(newres, 0) = Val_int(fd);
Field(newres, 1) = res;
res = newres;
}
}
End_roots();
return res;
}
CAMLprim value unix_select(value readfds, value writefds, value exceptfds,
value timeout)
{
fd_set read, write, except;
int maxfd;
double tm;
struct timeval tv;
struct timeval * tvp;
int retcode;
value res;
Begin_roots3 (readfds, writefds, exceptfds);
maxfd = -1;
retcode = fdlist_to_fdset(readfds, &read, &maxfd);
retcode += fdlist_to_fdset(writefds, &write, &maxfd);
retcode += fdlist_to_fdset(exceptfds, &except, &maxfd);
/* PR#5563: if a bad fd was encountered, report EINVAL error */
if (retcode != 0) unix_error(EINVAL, "select", Nothing);
tm = Double_val(timeout);
if (tm < 0.0)
tvp = (struct timeval *) NULL;
else {
tv.tv_sec = (int) tm;
tv.tv_usec = (int) (1e6 * (tm - tv.tv_sec));
tvp = &tv;
}
enter_blocking_section();
retcode = select(maxfd + 1, &read, &write, &except, tvp);
leave_blocking_section();
if (retcode == -1) uerror("select", Nothing);
readfds = fdset_to_fdlist(readfds, &read);
writefds = fdset_to_fdlist(writefds, &write);
exceptfds = fdset_to_fdlist(exceptfds, &except);
res = alloc_small(3, 0);
Field(res, 0) = readfds;
Field(res, 1) = writefds;
Field(res, 2) = exceptfds;
End_roots();
return res;
}
#else
CAMLprim value unix_select(value readfds, value writefds, value exceptfds,
value timeout)
{ invalid_argument("select not implemented"); }
#endif
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