1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
/*
* select.c - Builtin functions to provide select I/O multiplexing.
*/
/*
* Copyright (C) 2013 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
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <assert.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "gawkapi.h"
#include "gettext.h"
#define _(msgid) gettext(msgid)
#define N_(msgid) msgid
static const gawk_api_t *api; /* for convenience macros to work */
static awk_ext_id_t *ext_id;
static const char *ext_version = "ordchr extension: version 1.0";
static awk_bool_t (*init_func)(void) = NULL;
int plugin_is_GPL_compatible;
#if defined(HAVE_SELECT) && defined(HAVE_SYS_SELECT_H)
#include <sys/select.h>
#endif
#ifdef HAVE_SIGNAL_H
#include <signal.h>
#endif
/* do_ord --- return numeric value of first char of string */
static awk_value_t *
do_select(int nargs, awk_value_t *result)
{
static const char *argname[] = { "read", "write", "except" };
struct {
awk_value_t array;
awk_flat_array_t *flat;
fd_set bits;
int *array2fd;
} fds[3];
awk_value_t timeout_arg;
int i;
struct timeval maxwait;
struct timeval *timeout;
int nfds = 0;
int rc;
if (do_lint && nargs > 5)
lintwarn(ext_id, _("select: called with too many arguments"));
#define EL fds[i].flat->elements[j]
for (i = 0; i < sizeof(fds)/sizeof(fds[0]); i++) {
size_t j;
if (! get_argument(i, AWK_ARRAY, & fds[i].array)) {
warning(ext_id, _("select: bad array parameter `%s'"), argname[i]);
update_ERRNO_string(_("select: bad array parameter"));
return make_number(-1, result);
}
/* N.B. flatten_array fails for empty arrays, so that's OK */
FD_ZERO(&fds[i].bits);
if (flatten_array(fds[i].array.array_cookie, &fds[i].flat)) {
emalloc(fds[i].array2fd, int *, fds[i].flat->count*sizeof(int), "select");
for (j = 0; j < fds[i].flat->count; j++) {
fds[i].array2fd[j] = -1;
switch (EL.index.val_type) {
case AWK_NUMBER:
if (EL.index.num_value >= 0)
fds[i].array2fd[j] = EL.index.num_value;
if (fds[i].array2fd[j] != EL.index.num_value)
fds[i].array2fd[j] = -1;
break;
case AWK_STRING:
if (EL.value.val_type == AWK_STRING) {
const awk_input_buf_t *buf;
if ((buf = get_file(EL.index.str_value.str, EL.index.str_value.len, EL.value.str_value.str, EL.value.str_value.len)) != NULL)
fds[i].array2fd[j] = buf->fd;
}
break;
}
if (fds[i].array2fd[j] < 0) {
warning(ext_id, _("select: get_file failed"));
update_ERRNO_string(_("select: get_file failed"));
if (! release_flattened_array(fds[i].array.array_cookie, fds[i].flat))
warning(ext_id, _("select: release_flattened_array failed"));
free(fds[i].array2fd);
return make_number(-1, result);
}
FD_SET(fds[i].array2fd[j], &fds[i].bits);
if (nfds <= fds[i].array2fd[j])
nfds = fds[i].array2fd[j]+1;
}
}
else
fds[i].flat = NULL;
}
if (get_argument(3, AWK_NUMBER, &timeout_arg)) {
double secs = timeout_arg.num_value;
if (secs < 0) {
warning(ext_id, _("select: treating negative timeout as zero"));
secs = 0;
}
maxwait.tv_sec = secs;
maxwait.tv_usec = (secs-(double)maxwait.tv_sec)*1000000.0;
timeout = &maxwait;
} else
timeout = NULL;
rc = select(nfds, &fds[0].bits, &fds[1].bits, &fds[2].bits, timeout);
if (rc < 0) {
update_ERRNO_int(errno);
/* bit masks are undefined, so delete all array entries */
for (i = 0; i < sizeof(fds)/sizeof(fds[0]); i++) {
if (fds[i].flat) {
size_t j;
for (j = 0; j < fds[i].flat->count; j++)
EL.flags |= AWK_ELEMENT_DELETE;
if (! release_flattened_array(fds[i].array.array_cookie, fds[i].flat))
warning(ext_id, _("select: release_flattened_array failed"));
free(fds[i].array2fd);
}
}
return make_number(rc, result);
}
for (i = 0; i < sizeof(fds)/sizeof(fds[0]); i++) {
if (fds[i].flat) {
size_t j;
/* remove array elements not set in the bit mask */
for (j = 0; j < fds[i].flat->count; j++) {
if (! FD_ISSET(fds[i].array2fd[j], &fds[i].bits))
EL.flags |= AWK_ELEMENT_DELETE;
}
if (! release_flattened_array(fds[i].array.array_cookie, fds[i].flat))
warning(ext_id, _("select: release_flattened_array failed"));
free(fds[i].array2fd);
}
}
#undef EL
/* Set the return value */
return make_number(rc, result);
}
static awk_ext_func_t func_table[] = {
{ "select", do_select, 5 },
};
/* define the dl_load function using the boilerplate macro */
dl_load_func(func_table, select, "")
|
