lbbs/src/user_list.c

/***************************************************************************
                         user_list.c  -  description
                             -------------------
    Copyright            : (C) 2004-2025 by Leaflet
    Email                : leaflet@leafok.com
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program 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.                                   *
 *                                                                         *
 ***************************************************************************/

#include "common.h"
#include "database.h"
#include "log.h"
#include "user_list.h"
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <sys/ipc.h>
#include <sys/mman.h>
#include <sys/sem.h>
#include <sys/shm.h>

#ifdef _SEM_SEMUN_UNDEFINED
union semun
{
    int val;               /* Value for SETVAL */
    struct semid_ds *buf;  /* Buffer for IPC_STAT, IPC_SET */
    unsigned short *array; /* Array for GETALL, SETALL */
    struct seminfo *__buf; /* Buffer for IPC_INFO
                              (Linux-specific) */
};
#endif // #ifdef _SEM_SEMUN_UNDEFINED

#define USER_LIST_TRY_LOCK_WAIT_TIME 1 // second
#define USER_LIST_TRY_LOCK_TIMES 10

struct user_list_pool_t
{
    int shmid;
    int semid;
    USER_LIST user_list[2];
    USER_LIST *p_current;
    USER_LIST *p_new;
};
typedef struct user_list_pool_t USER_LIST_POOL;

static USER_LIST_POOL *p_user_list_pool = NULL;

int user_list_load(MYSQL *db, USER_LIST *p_list)
{
    MYSQL_RES *rs = NULL;
    MYSQL_ROW row;
    char sql[SQL_BUFFER_LEN];
    int ret = 0;
    int i;

    if (db == NULL || p_list == NULL)
    {
        log_error("NULL pointer error\n");
        return -1;
    }

    snprintf(sql, sizeof(sql),
             "SELECT user_list.UID AS UID, username, nickname, gender, gender_pub, life, exp, "
             "UNIX_TIMESTAMP(signup_dt), UNIX_TIMESTAMP(last_login_dt), UNIX_TIMESTAMP(birthday) "
             "FROM user_list INNER JOIN user_pubinfo ON user_list.UID = user_pubinfo.UID "
             "INNER JOIN user_reginfo ON user_list.UID = user_reginfo.UID "
             "WHERE enable ORDER BY UID");

    if (mysql_query(db, sql) != 0)
    {
        log_error("Query user info error: %s\n", mysql_error(db));
        ret = -1;
        goto cleanup;
    }

    if ((rs = mysql_use_result(db)) == NULL)
    {
        log_error("Get user info data failed\n");
        ret = -1;
        goto cleanup;
    }

    i = 0;
    while ((row = mysql_fetch_row(rs)))
    {
        p_list->users[i].uid = atoi(row[0]);
        strncpy(p_list->users[i].username, row[1], sizeof(p_list->users[i].username) - 1);
        p_list->users[i].username[sizeof(p_list->users[i].username) - 1] = '\0';
        strncpy(p_list->users[i].nickname, row[2], sizeof(p_list->users[i].nickname) - 1);
        p_list->users[i].nickname[sizeof(p_list->users[i].nickname) - 1] = '\0';
        p_list->users[i].gender = row[3][0];
        p_list->users[i].gender_pub = (int8_t)(row[4] == NULL ? 0 : atoi(row[4]));
        p_list->users[i].life = (row[5] == NULL ? 0 : atoi(row[5]));
        p_list->users[i].exp = (row[6] == NULL ? 0 : atoi(row[6]));
        p_list->users[i].signup_dt = (row[7] == NULL ? 0 : atol(row[7]));
        p_list->users[i].last_login_dt = (row[8] == NULL ? 0 : atol(row[8]));
        p_list->users[i].birthday = (row[9] == NULL ? 0 : atol(row[9]));

        i++;
    }
    mysql_free_result(rs);
    rs = NULL;

    p_list->user_count = i;

#ifdef _DEBUG
    log_error("Loaded %d users\n", p_list->user_count);
#endif

cleanup:
    mysql_free_result(rs);

    return ret;
}

int user_list_pool_init(void)
{
    int shmid;
    int semid;
    int proj_id;
    key_t key;
    size_t size;
    void *p_shm;
    union semun arg;
    int i;

    if (p_user_list_pool != NULL)
    {
        log_error("p_user_list_pool already initialized\n");
        return -1;
    }

    // Allocate shared memory
    proj_id = (int)(time(NULL) % getpid());
    key = ftok(VAR_USER_LIST_SHM, proj_id);
    if (key == -1)
    {
        log_error("ftok(%s %d) error (%d)\n", VAR_USER_LIST_SHM, proj_id, errno);
        return -2;
    }

    size = sizeof(USER_LIST_POOL);
    shmid = shmget(key, size, IPC_CREAT | IPC_EXCL | 0600);
    if (shmid == -1)
    {
        log_error("shmget(size = %d) error (%d)\n", size, errno);
        return -3;
    }
    p_shm = shmat(shmid, NULL, 0);
    if (p_shm == (void *)-1)
    {
        log_error("shmat(shmid=%d) error (%d)\n", shmid, errno);
        return -3;
    }

    p_user_list_pool = p_shm;
    p_user_list_pool->shmid = shmid;

    // Allocate semaphore as user list pool lock
    size = 2; // r_sem and w_sem
    semid = semget(key, (int)size, IPC_CREAT | IPC_EXCL | 0600);
    if (semid == -1)
    {
        log_error("semget(user_list_pool_sem, size = %d) error (%d)\n", size, errno);
        return -3;
    }

    // Initialize sem value to 0
    arg.val = 0;
    for (i = 0; i < size; i++)
    {
        if (semctl(semid, i, SETVAL, arg) == -1)
        {
            log_error("semctl(user_list_pool_sem, SETVAL) error (%d)\n", errno);
            return -3;
        }
    }

    p_user_list_pool->semid = semid;

    // Set user counts to 0
    p_user_list_pool->user_list[0].user_count = 0;
    p_user_list_pool->user_list[1].user_count = 0;

    p_user_list_pool->p_current = &(p_user_list_pool->user_list[0]);
    p_user_list_pool->p_new = &(p_user_list_pool->user_list[1]);

    return 0;
}

void user_list_pool_cleanup(void)
{
    int shmid;

    if (p_user_list_pool == NULL)
    {
        return;
    }

    shmid = p_user_list_pool->shmid;

    if (semctl(p_user_list_pool->semid, 0, IPC_RMID) == -1)
    {
        log_error("semctl(semid = %d, IPC_RMID) error (%d)\n", p_user_list_pool->semid, errno);
    }

    if (shmdt(p_user_list_pool) == -1)
    {
        log_error("shmdt(shmid = %d) error (%d)\n", shmid, errno);
    }

    if (shmctl(shmid, IPC_RMID, NULL) == -1)
    {
        log_error("shmctl(shmid = %d, IPC_RMID) error (%d)\n", shmid, errno);
    }

    p_user_list_pool = NULL;
}

int set_user_list_pool_shm_readonly(void)
{
    int shmid;
    void *p_shm;

    if (p_user_list_pool == NULL)
    {
        log_error("p_user_list_pool not initialized\n");
        return -1;
    }

    shmid = p_user_list_pool->shmid;

    // Remap shared memory in read-only mode
    p_shm = shmat(shmid, p_user_list_pool, SHM_RDONLY | SHM_REMAP);
    if (p_shm == (void *)-1)
    {
        log_error("shmat(user_list_pool shmid = %d) error (%d)\n", shmid, errno);
        return -3;
    }

    p_user_list_pool = p_shm;

    return 0;
}

int detach_user_list_pool_shm(void)
{
    if (p_user_list_pool != NULL && shmdt(p_user_list_pool) == -1)
    {
        log_error("shmdt(user_list_pool) error (%d)\n", errno);
        return -1;
    }

    p_user_list_pool = NULL;

    return 0;
}

int user_list_pool_reload(void)
{
    MYSQL *db = NULL;
    USER_LIST *p_tmp;
    int ret = 0;

    if (p_user_list_pool == NULL)
    {
        log_error("p_user_list_pool not initialized\n");
        return -1;
    }

    db = db_open();
    if (db == NULL)
    {
        log_error("db_open() error: %s\n", mysql_error(db));
        return -1;
    }

    if (user_list_rw_lock() < 0)
    {
        log_error("user_list_rw_lock() error\n");
        return -2;
    }

    if (user_list_load(db, p_user_list_pool->p_new) < 0)
    {
        log_error("user_list_rw_lock() error\n");
        ret = -3;
        goto cleanup;
    }

    // Swap p_current and p_new
    p_tmp = p_user_list_pool->p_current;
    p_user_list_pool->p_current = p_user_list_pool->p_new;
    p_user_list_pool->p_new = p_tmp;

cleanup:
    if (user_list_rw_unlock() < 0)
    {
        log_error("user_list_rw_unlock() error\n");
        ret = -2;
    }

    mysql_close(db);

    return ret;
}

int user_list_try_rd_lock(int wait_sec)
{
    struct sembuf sops[2];
    struct timespec timeout;
    int ret;

    sops[0].sem_num = 1; // w_sem
    sops[0].sem_op = 0;  // wait until unlocked
    sops[0].sem_flg = 0;

    sops[1].sem_num = 0;        // r_sem
    sops[1].sem_op = 1;         // lock
    sops[1].sem_flg = SEM_UNDO; // undo on terminate

    timeout.tv_sec = wait_sec;
    timeout.tv_nsec = 0;

    ret = semtimedop(p_user_list_pool->semid, sops, 2, &timeout);
    if (ret == -1 && errno != EAGAIN && errno != EINTR)
    {
        log_error("semtimedop(lock read) error %d\n", errno);
    }

    return ret;
}

int user_list_try_rw_lock(int wait_sec)
{
    struct sembuf sops[3];
    struct timespec timeout;
    int ret;

    sops[0].sem_num = 1; // w_sem
    sops[0].sem_op = 0;  // wait until unlocked
    sops[0].sem_flg = 0;

    sops[1].sem_num = 1;        // w_sem
    sops[1].sem_op = 1;         // lock
    sops[1].sem_flg = SEM_UNDO; // undo on terminate

    sops[2].sem_num = 0; // r_sem
    sops[2].sem_op = 0;  // wait until unlocked
    sops[2].sem_flg = 0;

    timeout.tv_sec = wait_sec;
    timeout.tv_nsec = 0;

    ret = semtimedop(p_user_list_pool->semid, sops, 3, &timeout);
    if (ret == -1 && errno != EAGAIN && errno != EINTR)
    {
        log_error("semtimedop(lock write) error %d\n", errno);
    }

    return ret;
}

int user_list_rd_unlock(void)
{
    struct sembuf sops[2];
    int ret;

    sops[0].sem_num = 0;                     // r_sem
    sops[0].sem_op = -1;                     // unlock
    sops[0].sem_flg = IPC_NOWAIT | SEM_UNDO; // no wait

    ret = semop(p_user_list_pool->semid, sops, 1);
    if (ret == -1 && errno != EAGAIN && errno != EINTR)
    {
        log_error("semop(unlock read) error %d\n", errno);
    }

    return ret;
}

int user_list_rw_unlock(void)
{
    struct sembuf sops[1];
    int ret;

    sops[0].sem_num = 1;                     // w_sem
    sops[0].sem_op = -1;                     // unlock
    sops[0].sem_flg = IPC_NOWAIT | SEM_UNDO; // no wait

    ret = semop(p_user_list_pool->semid, sops, 1);
    if (ret == -1 && errno != EAGAIN && errno != EINTR)
    {
        log_error("semop(unlock write) error %d\n", errno);
    }

    return ret;
}

int user_list_rd_lock(void)
{
    int timer = 0;
    int ret = -1;

    while (!SYS_server_exit)
    {
        ret = user_list_try_rd_lock(USER_LIST_TRY_LOCK_WAIT_TIME);
        if (ret == 0) // success
        {
            break;
        }
        else if (errno == EAGAIN || errno == EINTR) // retry
        {
            timer++;
            if (timer % USER_LIST_TRY_LOCK_TIMES == 0)
            {
                log_error("user_list_try_rd_lock() tried %d times\n", timer);
            }
        }
        else // failed
        {
            log_error("user_list_try_rd_lock() failed\n");
            break;
        }
    }

    return ret;
}

int user_list_rw_lock(void)
{
    int timer = 0;
    int ret = -1;

    while (!SYS_server_exit)
    {
        ret = user_list_try_rw_lock(USER_LIST_TRY_LOCK_WAIT_TIME);
        if (ret == 0) // success
        {
            break;
        }
        else if (errno == EAGAIN || errno == EINTR) // retry
        {
            timer++;
            if (timer % USER_LIST_TRY_LOCK_TIMES == 0)
            {
                log_error("user_list_try_rw_lock() tried %d times\n", timer);
            }
        }
        else // failed
        {
            log_error("user_list_try_rw_lock() failed\n");
            break;
        }
    }

    return ret;
}
1	/***************************************************************************
2	user_list.c - description
3	-------------------
4	Copyright : (C) 2004-2025 by Leaflet
5	Email : leaflet@leafok.com
6	***************************************************************************/
7
8	/***************************************************************************
9	* *
10	* This program is free software; you can redistribute it and/or modify *
11	* it under the terms of the GNU General Public License as published by *
12	* the Free Software Foundation; either version 3 of the License, or *
13	* (at your option) any later version. *
14	* *
15	***************************************************************************/
16
17	#include "common.h"
18	#include "database.h"
19	#include "log.h"
20	#include "user_list.h"
21	#include <errno.h>
22	#include <stdlib.h>
23	#include <string.h>
24	#include <time.h>
25	#include <sys/ipc.h>
26	#include <sys/mman.h>
27	#include <sys/sem.h>
28	#include <sys/shm.h>
29
30	#ifdef _SEM_SEMUN_UNDEFINED
31	union semun
32	{
33	int val; /* Value for SETVAL */
34	struct semid_ds buf; / Buffer for IPC_STAT, IPC_SET */
35	unsigned short array; / Array for GETALL, SETALL */
36	struct seminfo __buf; / Buffer for IPC_INFO
37	(Linux-specific) */
38	};
39	#endif // #ifdef _SEM_SEMUN_UNDEFINED
40
41	#define USER_LIST_TRY_LOCK_WAIT_TIME 1 // second
42	#define USER_LIST_TRY_LOCK_TIMES 10
43
44	struct user_list_pool_t
45	{
46	int shmid;
47	int semid;
48	USER_LIST user_list[2];
49	USER_LIST *p_current;
50	USER_LIST *p_new;
51	};
52	typedef struct user_list_pool_t USER_LIST_POOL;
53
54	static USER_LIST_POOL *p_user_list_pool = NULL;
55
56	int user_list_load(MYSQL db, USER_LIST p_list)
57	{
58	MYSQL_RES *rs = NULL;
59	MYSQL_ROW row;
60	char sql[SQL_BUFFER_LEN];
61	int ret = 0;
62	int i;
63
64	if (db == NULL \|\| p_list == NULL)
65	{
66	log_error("NULL pointer error\n");
67	return -1;
68	}
69
70	snprintf(sql, sizeof(sql),
71	"SELECT user_list.UID AS UID, username, nickname, gender, gender_pub, life, exp, "
72	"UNIX_TIMESTAMP(signup_dt), UNIX_TIMESTAMP(last_login_dt), UNIX_TIMESTAMP(birthday) "
73	"FROM user_list INNER JOIN user_pubinfo ON user_list.UID = user_pubinfo.UID "
74	"INNER JOIN user_reginfo ON user_list.UID = user_reginfo.UID "
75	"WHERE enable ORDER BY UID");
76
77	if (mysql_query(db, sql) != 0)
78	{
79	log_error("Query user info error: %s\n", mysql_error(db));
80	ret = -1;
81	goto cleanup;
82	}
83
84	if ((rs = mysql_use_result(db)) == NULL)
85	{
86	log_error("Get user info data failed\n");
87	ret = -1;
88	goto cleanup;
89	}
90
91	i = 0;
92	while ((row = mysql_fetch_row(rs)))
93	{
94	p_list->users[i].uid = atoi(row[0]);
95	strncpy(p_list->users[i].username, row[1], sizeof(p_list->users[i].username) - 1);
96	p_list->users[i].username[sizeof(p_list->users[i].username) - 1] = '\0';
97	strncpy(p_list->users[i].nickname, row[2], sizeof(p_list->users[i].nickname) - 1);
98	p_list->users[i].nickname[sizeof(p_list->users[i].nickname) - 1] = '\0';
99	p_list->users[i].gender = row[3][0];
100	p_list->users[i].gender_pub = (int8_t)(row[4] == NULL ? 0 : atoi(row[4]));
101	p_list->users[i].life = (row[5] == NULL ? 0 : atoi(row[5]));
102	p_list->users[i].exp = (row[6] == NULL ? 0 : atoi(row[6]));
103	p_list->users[i].signup_dt = (row[7] == NULL ? 0 : atol(row[7]));
104	p_list->users[i].last_login_dt = (row[8] == NULL ? 0 : atol(row[8]));
105	p_list->users[i].birthday = (row[9] == NULL ? 0 : atol(row[9]));
106
107	i++;
108	}
109	mysql_free_result(rs);
110	rs = NULL;
111
112	p_list->user_count = i;
113
114	#ifdef _DEBUG
115	log_error("Loaded %d users\n", p_list->user_count);
116	#endif
117
118	cleanup:
119	mysql_free_result(rs);
120
121	return ret;
122	}
123
124	int user_list_pool_init(void)
125	{
126	int shmid;
127	int semid;
128	int proj_id;
129	key_t key;
130	size_t size;
131	void *p_shm;
132	union semun arg;
133	int i;
134
135	if (p_user_list_pool != NULL)
136	{
137	log_error("p_user_list_pool already initialized\n");
138	return -1;
139	}
140
141	// Allocate shared memory
142	proj_id = (int)(time(NULL) % getpid());
143	key = ftok(VAR_USER_LIST_SHM, proj_id);
144	if (key == -1)
145	{
146	log_error("ftok(%s %d) error (%d)\n", VAR_USER_LIST_SHM, proj_id, errno);
147	return -2;
148	}
149
150	size = sizeof(USER_LIST_POOL);
151	shmid = shmget(key, size, IPC_CREAT \| IPC_EXCL \| 0600);
152	if (shmid == -1)
153	{
154	log_error("shmget(size = %d) error (%d)\n", size, errno);
155	return -3;
156	}
157	p_shm = shmat(shmid, NULL, 0);
158	if (p_shm == (void *)-1)
159	{
160	log_error("shmat(shmid=%d) error (%d)\n", shmid, errno);
161	return -3;
162	}
163
164	p_user_list_pool = p_shm;
165	p_user_list_pool->shmid = shmid;
166
167	// Allocate semaphore as user list pool lock
168	size = 2; // r_sem and w_sem
169	semid = semget(key, (int)size, IPC_CREAT \| IPC_EXCL \| 0600);
170	if (semid == -1)
171	{
172	log_error("semget(user_list_pool_sem, size = %d) error (%d)\n", size, errno);
173	return -3;
174	}
175
176	// Initialize sem value to 0
177	arg.val = 0;
178	for (i = 0; i < size; i++)
179	{
180	if (semctl(semid, i, SETVAL, arg) == -1)
181	{
182	log_error("semctl(user_list_pool_sem, SETVAL) error (%d)\n", errno);
183	return -3;
184	}
185	}
186
187	p_user_list_pool->semid = semid;
188
189	// Set user counts to 0
190	p_user_list_pool->user_list[0].user_count = 0;
191	p_user_list_pool->user_list[1].user_count = 0;
192
193	p_user_list_pool->p_current = &(p_user_list_pool->user_list[0]);
194	p_user_list_pool->p_new = &(p_user_list_pool->user_list[1]);
195
196	return 0;
197	}
198
199	void user_list_pool_cleanup(void)
200	{
201	int shmid;
202
203	if (p_user_list_pool == NULL)
204	{
205	return;
206	}
207
208	shmid = p_user_list_pool->shmid;
209
210	if (semctl(p_user_list_pool->semid, 0, IPC_RMID) == -1)
211	{
212	log_error("semctl(semid = %d, IPC_RMID) error (%d)\n", p_user_list_pool->semid, errno);
213	}
214
215	if (shmdt(p_user_list_pool) == -1)
216	{
217	log_error("shmdt(shmid = %d) error (%d)\n", shmid, errno);
218	}
219
220	if (shmctl(shmid, IPC_RMID, NULL) == -1)
221	{
222	log_error("shmctl(shmid = %d, IPC_RMID) error (%d)\n", shmid, errno);
223	}
224
225	p_user_list_pool = NULL;
226	}
227
228	int set_user_list_pool_shm_readonly(void)
229	{
230	int shmid;
231	void *p_shm;
232
233	if (p_user_list_pool == NULL)
234	{
235	log_error("p_user_list_pool not initialized\n");
236	return -1;
237	}
238
239	shmid = p_user_list_pool->shmid;
240
241	// Remap shared memory in read-only mode
242	p_shm = shmat(shmid, p_user_list_pool, SHM_RDONLY \| SHM_REMAP);
243	if (p_shm == (void *)-1)
244	{
245	log_error("shmat(user_list_pool shmid = %d) error (%d)\n", shmid, errno);
246	return -3;
247	}
248
249	p_user_list_pool = p_shm;
250
251	return 0;
252	}
253
254	int detach_user_list_pool_shm(void)
255	{
256	if (p_user_list_pool != NULL && shmdt(p_user_list_pool) == -1)
257	{
258	log_error("shmdt(user_list_pool) error (%d)\n", errno);
259	return -1;
260	}
261
262	p_user_list_pool = NULL;
263
264	return 0;
265	}
266
267	int user_list_pool_reload(void)
268	{
269	MYSQL *db = NULL;
270	USER_LIST *p_tmp;
271	int ret = 0;
272
273	if (p_user_list_pool == NULL)
274	{
275	log_error("p_user_list_pool not initialized\n");
276	return -1;
277	}
278
279	db = db_open();
280	if (db == NULL)
281	{
282	log_error("db_open() error: %s\n", mysql_error(db));
283	return -1;
284	}
285
286	if (user_list_rw_lock() < 0)
287	{
288	log_error("user_list_rw_lock() error\n");
289	return -2;
290	}
291
292	if (user_list_load(db, p_user_list_pool->p_new) < 0)
293	{
294	log_error("user_list_rw_lock() error\n");
295	ret = -3;
296	goto cleanup;
297	}
298
299	// Swap p_current and p_new
300	p_tmp = p_user_list_pool->p_current;
301	p_user_list_pool->p_current = p_user_list_pool->p_new;
302	p_user_list_pool->p_new = p_tmp;
303
304	cleanup:
305	if (user_list_rw_unlock() < 0)
306	{
307	log_error("user_list_rw_unlock() error\n");
308	ret = -2;
309	}
310
311	mysql_close(db);
312
313	return ret;
314	}
315
316	int user_list_try_rd_lock(int wait_sec)
317	{
318	struct sembuf sops[2];
319	struct timespec timeout;
320	int ret;
321
322	sops[0].sem_num = 1; // w_sem
323	sops[0].sem_op = 0; // wait until unlocked
324	sops[0].sem_flg = 0;
325
326	sops[1].sem_num = 0; // r_sem
327	sops[1].sem_op = 1; // lock
328	sops[1].sem_flg = SEM_UNDO; // undo on terminate
329
330	timeout.tv_sec = wait_sec;
331	timeout.tv_nsec = 0;
332
333	ret = semtimedop(p_user_list_pool->semid, sops, 2, &timeout);
334	if (ret == -1 && errno != EAGAIN && errno != EINTR)
335	{
336	log_error("semtimedop(lock read) error %d\n", errno);
337	}
338
339	return ret;
340	}
341
342	int user_list_try_rw_lock(int wait_sec)
343	{
344	struct sembuf sops[3];
345	struct timespec timeout;
346	int ret;
347
348	sops[0].sem_num = 1; // w_sem
349	sops[0].sem_op = 0; // wait until unlocked
350	sops[0].sem_flg = 0;
351
352	sops[1].sem_num = 1; // w_sem
353	sops[1].sem_op = 1; // lock
354	sops[1].sem_flg = SEM_UNDO; // undo on terminate
355
356	sops[2].sem_num = 0; // r_sem
357	sops[2].sem_op = 0; // wait until unlocked
358	sops[2].sem_flg = 0;
359
360	timeout.tv_sec = wait_sec;
361	timeout.tv_nsec = 0;
362
363	ret = semtimedop(p_user_list_pool->semid, sops, 3, &timeout);
364	if (ret == -1 && errno != EAGAIN && errno != EINTR)
365	{
366	log_error("semtimedop(lock write) error %d\n", errno);
367	}
368
369	return ret;
370	}
371
372	int user_list_rd_unlock(void)
373	{
374	struct sembuf sops[2];
375	int ret;
376
377	sops[0].sem_num = 0; // r_sem
378	sops[0].sem_op = -1; // unlock
379	sops[0].sem_flg = IPC_NOWAIT \| SEM_UNDO; // no wait
380
381	ret = semop(p_user_list_pool->semid, sops, 1);
382	if (ret == -1 && errno != EAGAIN && errno != EINTR)
383	{
384	log_error("semop(unlock read) error %d\n", errno);
385	}
386
387	return ret;
388	}
389
390	int user_list_rw_unlock(void)
391	{
392	struct sembuf sops[1];
393	int ret;
394
395	sops[0].sem_num = 1; // w_sem
396	sops[0].sem_op = -1; // unlock
397	sops[0].sem_flg = IPC_NOWAIT \| SEM_UNDO; // no wait
398
399	ret = semop(p_user_list_pool->semid, sops, 1);
400	if (ret == -1 && errno != EAGAIN && errno != EINTR)
401	{
402	log_error("semop(unlock write) error %d\n", errno);
403	}
404
405	return ret;
406	}
407
408	int user_list_rd_lock(void)
409	{
410	int timer = 0;
411	int ret = -1;
412
413	while (!SYS_server_exit)
414	{
415	ret = user_list_try_rd_lock(USER_LIST_TRY_LOCK_WAIT_TIME);
416	if (ret == 0) // success
417	{
418	break;
419	}
420	else if (errno == EAGAIN \|\| errno == EINTR) // retry
421	{
422	timer++;
423	if (timer % USER_LIST_TRY_LOCK_TIMES == 0)
424	{
425	log_error("user_list_try_rd_lock() tried %d times\n", timer);
426	}
427	}
428	else // failed
429	{
430	log_error("user_list_try_rd_lock() failed\n");
431	break;
432	}
433	}
434
435	return ret;
436	}
437
438	int user_list_rw_lock(void)
439	{
440	int timer = 0;
441	int ret = -1;
442
443	while (!SYS_server_exit)
444	{
445	ret = user_list_try_rw_lock(USER_LIST_TRY_LOCK_WAIT_TIME);
446	if (ret == 0) // success
447	{
448	break;
449	}
450	else if (errno == EAGAIN \|\| errno == EINTR) // retry
451	{
452	timer++;
453	if (timer % USER_LIST_TRY_LOCK_TIMES == 0)
454	{
455	log_error("user_list_try_rw_lock() tried %d times\n", timer);
456	}
457	}
458	else // failed
459	{
460	log_error("user_list_try_rw_lock() failed\n");
461	break;
462	}
463	}
464
465	return ret;
466	}
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