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logger.c
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logger.c
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#include "logger.h"
void log_command(char *command, int childId)
{
char *time_str = current_time_string();
char *buffer = (char *)malloc(1000 * sizeof(char));
int fd;
if (!buffer)
{
perror("Error while allocating buffer");
exit(EXIT_FAILURE);
}
tidy_time_str(time_str);
fd = open_file(time_str, buffer);
write_to_file(fd, time_str, buffer, childId, command);
free(buffer);
close_file(fd);
}
char *current_time_string()
{
struct timespec ts;
struct tm *timeinfo;
static char buffer[TIME_STR_MAX_LEN + 1];
clock_gettime(CLOCK_REALTIME, &ts);
timeinfo = localtime(&ts.tv_sec);
strftime(buffer, TIME_STR_MAX_LEN, "log_%Y_%m_%d_%H.%M.%S", timeinfo);
snprintf(buffer + strlen(buffer), TIME_STR_MAX_LEN - strlen(buffer),
".%09ld", ts.tv_nsec);
return buffer;
}
void tidy_time_str(char *time_str)
{
size_t len = strlen(time_str);
if (len > 0 && time_str[len - 1] == '\n')
{
time_str[len - 1] = '\0';
}
}
int open_file(char *time_str, char *buffer)
{
char *path = (char *)malloc(MAX_PATHNAME_LEN * sizeof(char));
int fd;
set_path(path, time_str, buffer);
check_path_exist();
fd = open(path, O_WRONLY | O_CREAT, FILE_MODE);
if (fd == -1)
{
perror("Error while opening log file");
free(buffer);
exit(EXIT_FAILURE);
}
free(path);
return fd;
}
void set_path(char *path, char *time_str, char *buffer)
{
if (!path)
{
perror("Error while allocating path");
free(buffer);
exit(EXIT_FAILURE);
}
sprintf(path, "logs/%s", time_str);
}
void check_path_exist()
{
struct stat st;
if (stat("./logs", &st) == -1)
{
mkdir("./logs", FILE_MODE);
}
}
void write_to_file(int log_fd, char *time_str, char *buffer, int childId, char *command)
{
int bytes_written = sprintf(buffer, "PID: %d\nCommand: %s\n", childId, command);
if (bytes_written < 0)
{
perror("Error while formatting log message");
free(buffer);
close(log_fd);
exit(EXIT_FAILURE);
}
if (write(log_fd, buffer, bytes_written) == -1)
{
perror("Error while writing to log file");
free(buffer);
close(log_fd);
exit(EXIT_FAILURE);
}
}
void close_file(int fd)
{
if (close(fd) == -1)
{
perror("Error while closing log file");
exit(EXIT_FAILURE);
}
}