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
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
/*
* Copyright 2020 Corey Minyard
*
* SPDX-License-Identifier: Apache-2.0
*/
/*
* A basic client that talks to the basic server. It sends the string
* given in argv[2] and waits for three lines from the server, printing
* them all out.
*
* To use this, run:
* basic_server telnet,tcp,3023 <string>
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <gensio/gensio.h>
#include <gensio/gensio_list.h>
static void
do_vlog(struct gensio_os_funcs *f, enum gensio_log_levels level,
const char *log, va_list args)
{
fprintf(stderr, "gensio %s log: ", gensio_log_level_to_str(level));
vfprintf(stderr, log, args);
fprintf(stderr, "\n");
}
struct coninfo {
struct gensio_os_funcs *o;
struct gensio *io;
struct gensio_waiter *waiter;
int err;
bool closing;
unsigned int incount; /* Counts read line. */
char *outbuf; /* Holds write data */
unsigned int outbuf_len;
unsigned int outbuf_pos;
};
static void
close_done(struct gensio *io, void *close_data)
{
struct coninfo *ci = close_data;
gensio_os_funcs_wake(ci->o, ci->waiter);
}
static void
start_close(struct coninfo *ci)
{
int rv;
ci->closing = true;
rv = gensio_close(ci->io, close_done, ci);
if (rv) {
/* Should be impossible, but just in case... */
ci->err = rv;
fprintf(stderr, "Error closing io: %s\n", gensio_err_to_str(rv));
close_done(ci->io, ci);
}
}
static int
io_event(struct gensio *io, void *user_data, int event, int err,
unsigned char *buf, gensiods *buflen,
const char *const *auxdata)
{
struct coninfo *ci = user_data;
gensiods len, i;
int rv;
switch (event) {
case GENSIO_EVENT_READ:
if (ci->closing) {
gensio_set_read_callback_enable(ci->io, false);
return 0;
}
if (err) {
fprintf(stderr, "Error from io: %s\n", gensio_err_to_str(err));
if (err != GE_REMCLOSE)
ci->err = err;
start_close(ci);
return 0;
}
len = *buflen;
for (i = 0; i < len; i++) {
if (buf[i] == '\n') {
ci->incount++;
if (ci->incount >= 3) {
gensio_set_read_callback_enable(ci->io, false);
start_close(ci);
}
i++;
break;
}
}
*buflen = i; /* We processed the characters up to the new line. */
fwrite(buf, 1, i, stdout);
fflush(stdout);
return 0;
case GENSIO_EVENT_WRITE_READY:
if (ci->closing) {
gensio_set_write_callback_enable(ci->io, false);
return 0;
}
if (ci->outbuf_pos < ci->outbuf_len) {
rv = gensio_write(ci->io, &i, ci->outbuf + ci->outbuf_pos,
ci->outbuf_len - ci->outbuf_pos, NULL);
if (rv) {
if (rv != GE_REMCLOSE)
fprintf(stderr, "Error writing to io: %s\n",
gensio_err_to_str(rv));
ci->err = rv;
start_close(ci);
}
ci->outbuf_pos += i;
}
if (ci->outbuf_pos >= ci->outbuf_len) {
gensio_set_read_callback_enable(ci->io, true);
gensio_set_write_callback_enable(ci->io, false);
}
return 0;
default:
return GE_NOTSUP;
}
}
int
main(int argc, char *argv[])
{
struct coninfo ci;
int rv;
struct gensio_os_proc_data *proc_data;
if (argc < 2) {
fprintf(stderr, "No gensio given\n");
return 1;
}
if (argc < 3) {
fprintf(stderr, "No string given\n");
return 1;
}
memset(&ci, 0, sizeof(ci));
rv = gensio_alloc_os_funcs(0, &ci.o, 0);
if (rv) {
fprintf(stderr, "Could not allocate OS handler: %s\n",
gensio_err_to_str(rv));
return 1;
}
gensio_os_funcs_set_vlog(ci.o, do_vlog);
rv = gensio_os_proc_setup(ci.o, &proc_data);
if (rv) {
fprintf(stderr, "Could not setup process data: %s\n",
gensio_err_to_str(rv));
return 1;
}
ci.outbuf_len = strlen(argv[2]);
ci.outbuf = calloc(1, ci.outbuf_len + 1);
if (!ci.outbuf) {
fprintf(stderr, "Out of memory\n");
return 1;
}
memcpy(ci.outbuf, argv[2], ci.outbuf_len);
ci.outbuf[ci.outbuf_len++] = '\n';
ci.waiter = gensio_os_funcs_alloc_waiter(ci.o);
if (!ci.waiter) {
rv = GE_NOMEM;
fprintf(stderr, "Could not waiter, out of memory\n");
goto out_err;
}
rv = str_to_gensio(argv[1], ci.o, io_event, &ci, &ci.io);
if (rv) {
fprintf(stderr, "Could not allocate %s: %s\n", argv[1],
gensio_err_to_str(rv));
goto out_err;
}
rv = gensio_open_s(ci.io);
if (rv) {
fprintf(stderr, "Could not open %s: %s\n", argv[1],
gensio_err_to_str(rv));
goto out_err;
}
gensio_set_write_callback_enable(ci.io, true);
rv = gensio_os_funcs_wait(ci.o, ci.waiter, 1, NULL);
if (ci.err)
rv = ci.err;
out_err:
free(ci.outbuf);
if (ci.io)
gensio_free(ci.io);
if (ci.waiter)
gensio_os_funcs_free_waiter(ci.o, ci.waiter);
gensio_os_proc_cleanup(proc_data);
gensio_os_funcs_free(ci.o);
return !!rv;
}
|
