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/*
* File Name: pthread_gprs.c
* Workflow: continually listen to MQ, write AT commands
* Note: AT commands must endline with '\n'
* Return Value: NULL always
*/
/* Header files */
#include <errno.h>
#include <pthread.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <sys/types.h>
#include "debug.h"
#include "proto.h"
/* external variables */
extern pthread_mutex_t mutex_gprs;
extern volatile sig_atomic_t should_exit;
void *pthread_gprs(void *args) {
ARG_STRUCT *p_resource_struct;
MQ_STRUCT *p_mq_struct = NULL;
ssize_t rwRetCount;
char staging_telnum[12] = "18851792375";
char rw_tempbuf[32] = {'\0'};
p_resource_struct = args;
memset(p_mq_struct, '\0', sizeof(MQ_STRUCT));
DebugLog("[DEBUG-INFO %s:%d]: Get read/write file describer: %d.\n",
__FUNCTION__, __LINE__, p_resource_struct->rw_fd);
DebugLog("[DEBUG-INFO %s:%d]: Get message queue ID: %d.\n", __FUNCTION__,
__LINE__, p_resource_struct->mq_id);
// read from message queue
while (!should_exit) {
msgrcv(p_resource_struct->mq_id, p_mq_struct,
sizeof(MQ_STRUCT) - sizeof(long), 21L, 0);
memset(rw_tempbuf, '\0', sizeof(rw_tempbuf));
pthread_mutex_lock(&mutex_gprs);
if (p_mq_struct->tswitch == 1) {
// init module
strcpy(rw_tempbuf, "AT;\n");
rwRetCount =
write(p_resource_struct->rw_fd, rw_tempbuf, strlen(rw_tempbuf));
if (rwRetCount < 4) {
fprintf(stderr, "[%s:%d] Not enough bytes written.\n", __FUNCTION__,
__LINE__);
continue;
}
DebugLog("[DEBUG-INFO %s:%d]: Write AT command, %zd Byte(s) written.\n",
__FUNCTION__, __LINE__, rwRetCount);
// alarm call
memset(rw_tempbuf, '\0', sizeof(rw_tempbuf));
sprintf(rw_tempbuf, "ATD%s;", staging_telnum);
strcat(rw_tempbuf, "\n");
rwRetCount =
write(p_resource_struct->rw_fd, rw_tempbuf, strlen(rw_tempbuf));
if (rwRetCount < 16) {
fprintf(stderr, "[%s:%d] Not enough bytes written.\n", __FUNCTION__,
__LINE__);
continue;
}
DebugLog("[DEBUG-INFO %s:%d]: Write AT command, %zd Byte(s) written.\n",
__FUNCTION__, __LINE__, rwRetCount);
} else if (p_mq_struct->tswitch == 0) {
strcpy(rw_tempbuf, "ATH;\n");
rwRetCount =
write(p_resource_struct->rw_fd, rw_tempbuf, strlen(rw_tempbuf));
if (rwRetCount < 5) {
fprintf(stderr, "[%s:%d] Not enough bytes written.\n", __FUNCTION__,
__LINE__);
continue;
}
DebugLog("[DEBUG-INFO %s:%d]: Write AT command, %zd Byte(s) written.\n",
__FUNCTION__, __LINE__, rwRetCount);
}
pthread_mutex_unlock(&mutex_gprs);
}
pthread_exit(NULL);
}
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