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/**************************************************************************/
/* */
/* OCaml */
/* */
/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
/* */
/* Copyright 1998 Institut National de Recherche en Informatique et */
/* en Automatique. */
/* */
/* All rights reserved. This file is distributed under the terms of */
/* the GNU Lesser General Public License version 2.1, with the */
/* special exception on linking described in the file LICENSE. */
/* */
/**************************************************************************/
#define CAML_INTERNALS
#include <errno.h>
#include <signal.h>
#include <caml/alloc.h>
#include <caml/fail.h>
#include <caml/memory.h>
#include <caml/mlvalues.h>
#include <caml/signals.h>
#include "unixsupport.h"
#ifdef POSIX_SIGNALS
static void decode_sigset(value vset, sigset_t * set)
{
sigemptyset(set);
for (/*nothing*/; vset != Val_emptylist; vset = Field(vset, 1)) {
int sig = caml_convert_signal_number(Int_val(Field(vset, 0)));
sigaddset(set, sig);
}
}
static value encode_sigset(sigset_t * set)
{
CAMLparam0();
CAMLlocal1(res);
int i;
for (i = 1; i < NSIG; i++)
if (sigismember(set, i) > 0) {
value newcons = caml_alloc_2(Tag_cons,
Val_int(caml_rev_convert_signal_number(i)),
res);
res = newcons;
}
CAMLreturn(res);
}
static int sigprocmask_cmd[3] = { SIG_SETMASK, SIG_BLOCK, SIG_UNBLOCK };
CAMLprim value caml_unix_sigprocmask(value vaction, value vset)
{
int how;
sigset_t set, oldset;
int retcode;
how = sigprocmask_cmd[Int_val(vaction)];
decode_sigset(vset, &set);
caml_enter_blocking_section();
retcode = sigprocmask(how, &set, &oldset);
caml_leave_blocking_section();
/* Run any handlers for just-unmasked pending signals */
caml_process_pending_actions();
if (retcode != 0) caml_unix_error(retcode, "sigprocmask", Nothing);
return encode_sigset(&oldset);
}
CAMLprim value caml_unix_sigpending(value unit)
{
sigset_t pending;
int i, j;
uintnat curr;
if (sigpending(&pending) == -1) caml_uerror("sigpending", Nothing);
for (i = 0; i < NSIG_WORDS; i++) {
curr = atomic_load(&caml_pending_signals[i]);
if (curr == 0) continue;
for (j = 0; j < BITS_PER_WORD; j++) {
if (curr & ((uintnat)1 << j))
sigaddset(&pending, i * BITS_PER_WORD + j + 1);
}
}
return encode_sigset(&pending);
}
CAMLprim value caml_unix_sigsuspend(value vset)
{
sigset_t set;
int retcode;
decode_sigset(vset, &set);
caml_enter_blocking_section();
retcode = sigsuspend(&set);
caml_leave_blocking_section();
if (retcode == -1 && errno != EINTR) caml_uerror("sigsuspend", Nothing);
return Val_unit;
}
#else
CAMLprim value caml_unix_sigprocmask(value vaction, value vset)
{ caml_invalid_argument("Unix.sigprocmask not available"); }
CAMLprim value caml_unix_sigpending(value unit)
{ caml_invalid_argument("Unix.sigpending not available"); }
CAMLprim value caml_unix_sigsuspend(value vset)
{ caml_invalid_argument("Unix.sigsuspend not available"); }
#endif
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