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