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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 Lesser General Public License version 2.1, with the */
/* special exception on linking described in the file LICENSE. */
/* */
/**************************************************************************/
#define CAML_INTERNALS
#include <caml/mlvalues.h>
#include <caml/alloc.h>
#include <caml/fail.h>
#include <caml/memory.h>
#include <caml/signals.h>
#include "unixsupport.h"
#include <sys/types.h>
#include <sys/wait.h>
#if !(defined(WIFEXITED) && defined(WEXITSTATUS) && defined(WIFSTOPPED) && \
defined(WSTOPSIG) && defined(WTERMSIG))
/* Assume old-style V7 status word */
#define WIFEXITED(status) (((status) & 0xFF) == 0)
#define WEXITSTATUS(status) (((status) >> 8) & 0xFF)
#define WIFSTOPPED(status) (((status) & 0xFF) == 0xFF)
#define WSTOPSIG(status) (((status) >> 8) & 0xFF)
#define WTERMSIG(status) ((status) & 0x3F)
#endif
#define TAG_WEXITED 0
#define TAG_WSIGNALED 1
#define TAG_WSTOPPED 2
static value alloc_process_status(int pid, int status)
{
CAMLparam0();
CAMLlocal1(st);
value res;
// status is undefined when pid is zero so we set a default value.
if (pid == 0) status = 0;
if (WIFEXITED(status)) {
st = caml_alloc_small(1, TAG_WEXITED);
Field(st, 0) = Val_int(WEXITSTATUS(status));
}
else if (WIFSTOPPED(status)) {
st = caml_alloc_small(1, TAG_WSTOPPED);
Field(st, 0) = Val_int(caml_rev_convert_signal_number(WSTOPSIG(status)));
}
else {
st = caml_alloc_small(1, TAG_WSIGNALED);
Field(st, 0) = Val_int(caml_rev_convert_signal_number(WTERMSIG(status)));
}
res = caml_alloc_small(2, 0);
Field(res, 0) = Val_int(pid);
Field(res, 1) = st;
CAMLreturn(res);
}
CAMLprim value caml_unix_wait(value unit)
{
int pid, status;
caml_enter_blocking_section();
pid = wait(&status);
caml_leave_blocking_section();
if (pid == -1) caml_uerror("wait", Nothing);
return alloc_process_status(pid, status);
}
#if defined(HAS_WAITPID) || defined(HAS_WAIT4)
#ifndef HAS_WAITPID
#define waitpid(pid,status,opts) wait4(pid,status,opts,NULL)
#endif
static const int wait_flag_table[] = {
WNOHANG, WUNTRACED
};
CAMLprim value caml_unix_waitpid(value flags, value pid_req)
{
int pid, status, cv_flags;
cv_flags = caml_convert_flag_list(flags, wait_flag_table);
caml_enter_blocking_section();
pid = waitpid(Int_val(pid_req), &status, cv_flags);
caml_leave_blocking_section();
if (pid == -1) caml_uerror("waitpid", Nothing);
return alloc_process_status(pid, status);
}
#else
CAMLprim value caml_unix_waitpid(value flags, value pid_req)
{ caml_invalid_argument("waitpid not implemented"); }
#endif
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