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/*
* fork.c - Provide fork and waitpid functions for gawk.
*/
/*
* Copyright (C) 2001 the Free Software Foundation, Inc.
*
* This file is part of GAWK, the GNU implementation of the
* AWK Programming Language.
*
* GAWK is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GAWK is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include "awk.h"
#include <sys/wait.h>
/* do_fork --- provide dynamically loaded fork() builtin for gawk */
static NODE *
do_fork(tree)
NODE *tree;
{
int ret = -1;
NODE **aptr;
if (do_lint && tree->param_cnt > 0)
lintwarn("fork: called with too many arguments");
ret = fork();
if (ret < 0)
update_ERRNO();
else if (ret == 0) {
/* update PROCINFO in the child */
aptr = assoc_lookup(PROCINFO_node, tmp_string("pid", 3), FALSE);
(*aptr)->numbr = (AWKNUM) getpid();
aptr = assoc_lookup(PROCINFO_node, tmp_string("ppid", 4), FALSE);
(*aptr)->numbr = (AWKNUM) getppid();
}
/* Set the return value */
set_value(tmp_number((AWKNUM) ret));
/* Just to make the interpreter happy */
return tmp_number((AWKNUM) 0);
}
/* do_waitpid --- provide dynamically loaded waitpid() builtin for gawk */
static NODE *
do_waitpid(tree)
NODE *tree;
{
NODE *pidnode;
int ret = -1;
double pidval;
pid_t pid;
int options = 0;
if (do_lint && tree->param_cnt > 1)
lintwarn("waitpid: called with too many arguments");
pidnode = get_argument(tree, 0);
if (pidnode != NULL) {
pidval = force_number(pidnode);
pid = (int) pidval;
options = WNOHANG|WUNTRACED;
ret = waitpid(pid, NULL, options);
if (ret < 0)
update_ERRNO();
} else if (do_lint)
lintwarn("wait: called with no arguments");
/* Set the return value */
set_value(tmp_number((AWKNUM) ret));
/* Just to make the interpreter happy */
return tmp_number((AWKNUM) 0);
}
/* dlload --- load new builtins in this library */
NODE *
dlload(tree, dl)
NODE *tree;
void *dl;
{
make_builtin("fork", do_fork, 0);
make_builtin("waitpid", do_waitpid, 1);
return tmp_number((AWKNUM) 0);
}
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