59 lines
1.4 KiB
C
59 lines
1.4 KiB
C
#include "monitor_user.h"
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#include <fcntl.h>
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#include <stdio.h>
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#include <sys/ioctl.h>
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#include <unistd.h>
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#define DEVICE "/dev/variable_monitor"
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int file_desc = -1;
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/// @brief start watch
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/// @param w_arg
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/// @return 0 means success, other means fail
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int start_watch(watch_arg w_arg) {
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if (file_desc < 0) {
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file_desc = open(DEVICE, 0);
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}
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if (file_desc < 0) {
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printf("Can't open device file: %s\n", DEVICE);
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return -1;
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}
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if (ioctl(file_desc, 0, &w_arg) < 0) {
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printf("ioctl failed\n");
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close(file_desc);
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return -1;
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}
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return 0;
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}
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/// @brief cancel watch
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/// @return 0 means success, other means fail
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int cancel_watch() {
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if (file_desc < 0) {
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file_desc = open(DEVICE, 0);
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}
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if (file_desc < 0) {
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printf("Device not open: %s,%d \n", DEVICE, file_desc);
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return file_desc;
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}
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close(file_desc);
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file_desc = -1;
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return 0;
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}
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void init_watch_arg(watch_arg *wg, char *name, void *ptr,
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int length_byte, long long threshold,
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unsigned char unsigned_flag,
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unsigned char above_threshold, unsigned long time_ns){
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wg->task_id = getpid();
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strncpy(wg->name, name, (MAX_NAME_LEN + 1));
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wg->ptr = ptr;
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wg->length_byte = length_byte;
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wg->threshold = threshold;
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wg->unsigned_flag = unsigned_flag;
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wg->above_threshold = above_threshold;
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wg->time_ns = time_ns;
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}
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