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/*
* fork.c - Provide fork and waitpid functions for gawk.
*
* Revised 6/2004
* Revised 5/2012 for new extension API.
*/
/*
* Copyright (C) 2001, 2004, 2011, 2012 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 3 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <stdio.h>
#include <assert.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "config.h"
#include "gawkapi.h"
static const gawk_api_t *api; /* for convenience macros to work */
static awk_ext_id_t *ext_id;
int plugin_is_GPL_compatible;
/* array_set --- set an array element */
static void
array_set_numeric(awk_array_t array, const char *sub, double num)
{
awk_value_t index, value;
set_array_element(array,
make_string(sub, strlen(sub), & index),
make_number(num, & value));
}
/* do_fork --- provide dynamically loaded fork() builtin for gawk */
static awk_value_t *
do_fork(int nargs, awk_value_t *result)
{
int ret = -1;
assert(result != NULL);
if (do_lint && nargs > 0)
lintwarn(ext_id, "fork: called with too many arguments");
ret = fork();
if (ret < 0)
update_ERRNO_int(errno);
else if (ret == 0) {
/* update PROCINFO in the child, if the array exists */
awk_value_t procinfo;
if (sym_lookup("PROCINFO", AWK_ARRAY, & procinfo)) {
if (procinfo.val_type != AWK_ARRAY) {
if (do_lint)
lintwarn(ext_id, "fork: PROCINFO is not an array!");
} else {
array_set_numeric(procinfo.array_cookie, "pid", getpid());
array_set_numeric(procinfo.array_cookie, "ppid", getppid());
}
}
}
/* Set the return value */
return make_number(ret, result);
}
/* do_waitpid --- provide dynamically loaded waitpid() builtin for gawk */
static awk_value_t *
do_waitpid(int nargs, awk_value_t *result)
{
awk_value_t pid;
int ret = -1;
int options = 0;
assert(result != NULL);
if (do_lint && nargs > 1)
lintwarn(ext_id, "waitpid: called with too many arguments");
if (get_argument(0, AWK_NUMBER, &pid)) {
options = WNOHANG|WUNTRACED;
ret = waitpid(pid.num_value, NULL, options);
if (ret < 0)
update_ERRNO_int(errno);
} else if (do_lint)
lintwarn(ext_id, "wait: called with no arguments");
/* Set the return value */
return make_number(ret, result);
}
/* do_wait --- provide dynamically loaded wait() builtin for gawk */
static awk_value_t *
do_wait(int nargs, awk_value_t *result)
{
int ret;
assert(result != NULL);
if (do_lint && nargs > 0)
lintwarn(ext_id, "wait: called with too many arguments");
ret = wait(NULL);
if (ret < 0)
update_ERRNO_int(errno);
/* Set the return value */
return make_number(ret, result);
}
static awk_ext_func_t func_table[] = {
{ "fork", do_fork, 0 },
{ "waitpid", do_waitpid, 1 },
{ "wait", do_wait, 0 },
};
/* define the dl_load function using the boilerplate macro */
dl_load_func(func_table, fork, "")
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