| 1 | /*
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| 2 | * fork.c - Provide fork and waitpid functions for gawk.
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| 3 | *
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| 4 | * Revised 6/2004
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| 5 | */
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| 6 |
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| 7 | /*
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| 8 | * Copyright (C) 2001, 2004 the Free Software Foundation, Inc.
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| 9 | *
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| 10 | * This file is part of GAWK, the GNU implementation of the
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| 11 | * AWK Programming Language.
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| 12 | *
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| 13 | * GAWK is free software; you can redistribute it and/or modify
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| 14 | * it under the terms of the GNU General Public License as published by
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| 15 | * the Free Software Foundation; either version 2 of the License, or
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| 16 | * (at your option) any later version.
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| 17 | *
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| 18 | * GAWK is distributed in the hope that it will be useful,
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| 19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 21 | * GNU General Public License for more details.
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| 22 | *
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| 23 | * You should have received a copy of the GNU General Public License
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| 24 | * along with this program; if not, write to the Free Software
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| 25 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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| 26 | */
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| 27 |
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| 28 | #include "awk.h"
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| 29 |
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| 30 | /* do_fork --- provide dynamically loaded fork() builtin for gawk */
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| 31 |
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| 32 | static NODE *
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| 33 | do_fork(tree)
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| 34 | NODE *tree;
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| 35 | {
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| 36 | int ret = -1;
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| 37 | NODE **aptr;
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| 38 |
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| 39 | if (do_lint && get_curfunc_arg_count() > 0)
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| 40 | lintwarn("fork: called with too many arguments");
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| 41 |
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| 42 | ret = fork();
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| 43 |
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| 44 | if (ret < 0)
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| 45 | update_ERRNO();
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| 46 | else if (ret == 0) {
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| 47 | /* update PROCINFO in the child */
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| 48 |
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| 49 | aptr = assoc_lookup(PROCINFO_node, tmp_string("pid", 3), FALSE);
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| 50 | (*aptr)->numbr = (AWKNUM) getpid();
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| 51 |
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| 52 | aptr = assoc_lookup(PROCINFO_node, tmp_string("ppid", 4), FALSE);
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| 53 | (*aptr)->numbr = (AWKNUM) getppid();
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| 54 | }
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| 55 |
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| 56 | /* Set the return value */
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| 57 | set_value(tmp_number((AWKNUM) ret));
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| 58 |
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| 59 | /* Just to make the interpreter happy */
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| 60 | return tmp_number((AWKNUM) 0);
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| 61 | }
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| 62 |
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| 63 |
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| 64 | /* do_waitpid --- provide dynamically loaded waitpid() builtin for gawk */
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| 65 |
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| 66 | static NODE *
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| 67 | do_waitpid(tree)
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| 68 | NODE *tree;
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| 69 | {
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| 70 | NODE *pidnode;
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| 71 | int ret = -1;
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| 72 | double pidval;
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| 73 | pid_t pid;
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| 74 | int options = 0;
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| 75 |
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| 76 | if (do_lint && get_curfunc_arg_count() > 1)
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| 77 | lintwarn("waitpid: called with too many arguments");
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| 78 |
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| 79 | pidnode = get_argument(tree, 0);
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| 80 | if (pidnode != NULL) {
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| 81 | pidval = force_number(pidnode);
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| 82 | pid = (int) pidval;
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| 83 | options = WNOHANG|WUNTRACED;
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| 84 | ret = waitpid(pid, NULL, options);
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| 85 | if (ret < 0)
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| 86 | update_ERRNO();
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| 87 | } else if (do_lint)
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| 88 | lintwarn("wait: called with no arguments");
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| 89 |
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| 90 | /* Set the return value */
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| 91 | set_value(tmp_number((AWKNUM) ret));
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| 92 |
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| 93 | /* Just to make the interpreter happy */
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| 94 | return tmp_number((AWKNUM) 0);
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| 95 | }
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| 96 |
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| 97 | /* dlload --- load new builtins in this library */
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| 98 |
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| 99 | NODE *
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| 100 | dlload(tree, dl)
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| 101 | NODE *tree;
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| 102 | void *dl;
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| 103 | {
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| 104 | make_builtin("fork", do_fork, 0);
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| 105 | make_builtin("waitpid", do_waitpid, 1);
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| 106 | return tmp_number((AWKNUM) 0);
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| 107 | }
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