demux.c 5.83 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
/* -*- Mode: C; c-basic-offset:4 ; -*- */
/*
 *  (C) 2008 by Argonne National Laboratory.
 *      See COPYRIGHT in top-level directory.
 */

#include "demux.h"
#include "demux_internal.h"

int HYDT_dmxu_num_cb_fds = 0;
struct HYDT_dmxu_callback *HYDT_dmxu_cb_list = NULL;
struct HYDT_dmxu_fns HYDT_dmxu_fns = { 0 };
13

14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
int HYDT_dmxu_got_sigttin = 0;

#if defined(SIGTTIN) && defined(HAVE_ISATTY)
static void signal_cb(int sig)
{
    HYDU_FUNC_ENTER();

    if (sig == SIGTTIN) {
        HYDT_dmxu_got_sigttin = 1;
    }
    /* Ignore all other signals */

    HYDU_FUNC_EXIT();
    return;
}
#endif /* SIGTTIN and HAVE_ISATTY */
30
31
32
33
34
35
36

HYD_status HYDT_dmx_init(char **demux)
{
    HYD_status status = HYD_SUCCESS;

    HYDU_FUNC_ENTER();

37
    if (!(*demux)) {    /* user didn't specify anything */
38
39
#if defined HAVE_POLL
        HYDT_dmxu_fns.wait_for_event = HYDT_dmxu_poll_wait_for_event;
40
        HYDT_dmxu_fns.stdin_valid = HYDT_dmxu_poll_stdin_valid;
41
42
43
        *demux = HYDU_strdup("poll");
#elif defined HAVE_SELECT
        HYDT_dmxu_fns.wait_for_event = HYDT_dmxu_select_wait_for_event;
44
        HYDT_dmxu_fns.stdin_valid = HYDT_dmxu_select_stdin_valid;
45
46
47
48
49
50
        *demux = HYDU_strdup("select");
#endif /* HAVE_SELECT */
    }
    else if (!strcmp(*demux, "poll")) { /* user wants to use poll */
#if defined HAVE_POLL
        HYDT_dmxu_fns.wait_for_event = HYDT_dmxu_poll_wait_for_event;
51
        HYDT_dmxu_fns.stdin_valid = HYDT_dmxu_poll_stdin_valid;
52
53
#endif /* HAVE_POLL */
    }
54
    else if (!strcmp(*demux, "select")) {       /* user wants to use select */
55
56
#if defined HAVE_SELECT
        HYDT_dmxu_fns.wait_for_event = HYDT_dmxu_select_wait_for_event;
57
        HYDT_dmxu_fns.stdin_valid = HYDT_dmxu_select_stdin_valid;
58
59
60
#endif /* HAVE_SELECT */
    }

61
    if (HYDT_dmxu_fns.wait_for_event == NULL || HYDT_dmxu_fns.stdin_valid == NULL) {
62
        /* We couldn't find anything; return an error */
63
64
        HYDU_ERR_SETANDJUMP(status, HYD_INTERNAL_ERROR,
                            "cannot find an appropriate demux engine\n");
65
66
    }

67
68
69
70
71
72
73
#if defined(SIGTTIN) && defined(HAVE_ISATTY)
    if (isatty(STDIN_FILENO)) {
        status = HYDU_set_signal(SIGTTIN, signal_cb);
        HYDU_ERR_POP(status, "unable to set SIGTTIN\n");
    }
#endif /* SIGTTIN and HAVE_ISATTY */

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
  fn_exit:
    HYDU_FUNC_EXIT();
    return status;

  fn_fail:
    goto fn_exit;
}

HYD_status HYDT_dmx_register_fd(int num_fds, int *fd, HYD_event_t events, void *userp,
                                HYD_status(*callback) (int fd, HYD_event_t events,
                                                       void *userp))
{
    struct HYDT_dmxu_callback *cb_element, *run;
#if defined HAVE_ERROR_CHECKING
    int i, j;
#endif /* HAVE_ERROR_CHECKING */
    HYD_status status = HYD_SUCCESS;

    HYDU_FUNC_ENTER();

    HYDU_ASSERT(events, status);

#if defined HAVE_ERROR_CHECKING
    for (i = 0; i < num_fds; i++) {
        if (fd[i] < 0)
99
            HYDU_ERR_SETANDJUMP(status, HYD_INTERNAL_ERROR, "registering bad fd %d\n", fd[i]);
100
101
102
103
104

        cb_element = HYDT_dmxu_cb_list;
        while (cb_element) {
            for (j = 0; j < cb_element->num_fds; j++) {
                if (cb_element->fd[j] == fd[i]) {
105
106
                    HYDU_ERR_SETANDJUMP(status, HYD_INTERNAL_ERROR,
                                        "registering duplicate fd %d\n", fd[i]);
107
108
109
110
111
112
113
                }
            }
            cb_element = cb_element->next;
        }
    }
#endif /* HAVE_ERROR_CHECKING */

114
115
    HYDU_MALLOC(cb_element, struct HYDT_dmxu_callback *, sizeof(struct HYDT_dmxu_callback),
                status);
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
    cb_element->num_fds = num_fds;
    HYDU_MALLOC(cb_element->fd, int *, num_fds * sizeof(int), status);
    memcpy(cb_element->fd, fd, num_fds * sizeof(int));
    cb_element->events = events;
    cb_element->userp = userp;
    cb_element->callback = callback;
    cb_element->next = NULL;

    if (HYDT_dmxu_cb_list == NULL) {
        HYDT_dmxu_cb_list = cb_element;
    }
    else {
        run = HYDT_dmxu_cb_list;
        while (run->next)
            run = run->next;
        run->next = cb_element;
    }

    HYDT_dmxu_num_cb_fds += num_fds;

  fn_exit:
    HYDU_FUNC_EXIT();
    return status;

  fn_fail:
    goto fn_exit;
}

HYD_status HYDT_dmx_deregister_fd(int fd)
{
    int i;
    struct HYDT_dmxu_callback *cb_element;
    HYD_status status = HYD_SUCCESS;

    HYDU_FUNC_ENTER();

    cb_element = HYDT_dmxu_cb_list;
    while (cb_element) {
        for (i = 0; i < cb_element->num_fds; i++) {
            if (cb_element->fd[i] == fd) {
156
                cb_element->fd[i] = HYD_FD_UNSET;
157
158
159
160
161
162
163
164
                HYDT_dmxu_num_cb_fds--;
                goto fn_exit;
            }
        }
        cb_element = cb_element->next;
    }

    /* FD is not found */
165
166
    HYDU_ERR_SETANDJUMP(status, HYD_INTERNAL_ERROR,
                        "could not find fd to deregister: %d\n", fd);
167
168
169
170
171
172
173
174
175
176
177
178
179
180

  fn_exit:
    HYDU_FUNC_EXIT();
    return status;

  fn_fail:
    goto fn_exit;
}

HYD_status HYDT_dmx_wait_for_event(int wtime)
{
    return HYDT_dmxu_fns.wait_for_event(wtime);
}

Pavan Balaji's avatar
Pavan Balaji committed
181
int HYDT_dmx_query_fd_registration(int fd)
182
183
{
    struct HYDT_dmxu_callback *run;
Pavan Balaji's avatar
Pavan Balaji committed
184
    int i, ret;
185
186
187

    HYDU_FUNC_ENTER();

Pavan Balaji's avatar
Pavan Balaji committed
188
    ret = 0;
189
190
191
    for (run = HYDT_dmxu_cb_list; run; run = run->next) {
        for (i = 0; i < run->num_fds; i++) {
            if (run->fd[i] == fd) {     /* found it */
Pavan Balaji's avatar
Pavan Balaji committed
192
                ret = 1;
193
194
195
                break;
            }
        }
Pavan Balaji's avatar
Pavan Balaji committed
196
        if (ret)
197
198
199
200
201
            break;
    }

    HYDU_FUNC_EXIT();

Pavan Balaji's avatar
Pavan Balaji committed
202
    return ret;
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
}

HYD_status HYDT_dmx_finalize(void)
{
    struct HYDT_dmxu_callback *run1, *run2;
    HYD_status status = HYD_SUCCESS;

    HYDU_FUNC_ENTER();

    run1 = HYDT_dmxu_cb_list;
    while (run1) {
        run2 = run1->next;
        if (run1->fd)
            HYDU_FREE(run1->fd);
        HYDU_FREE(run1);
        run1 = run2;
    }
    HYDT_dmxu_cb_list = NULL;

    HYDU_FUNC_EXIT();
    return status;
}

HYD_status HYDT_dmx_stdin_valid(int *out)
{
228
    return HYDT_dmxu_fns.stdin_valid(out);
229
}