写log日志文件

1200阅读　0评论2017-12-28　Tay_linux
分类：LINUX


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  1. #include <stdio.h>
  2. #include <unistd.h>
  3. #include <sys/types.h>
  4. #include <sys/stat.h>
  5. #include <fcntl.h>
  6. #include <time.h>
  7. #include <string.h>

  9. int Write_log_file(char *pFilename, char *pBuffer, int data_len)
  10. {
  11.     int ret_val = -1;
  12.     int fd = -1;
  13.     mode_t f_attrib;
  14.     time_t cur_time;
  15.     struct tm *pTm;
  16.     char date_buf[50];

  18.     f_attrib = S_IRWXU | S_IRWXG | S_IRWXO;
  19.     /**/
  20.     fd = open(pFilename, O_RDWR|O_APPEND|O_CREAT, f_attrib);
  21.     if(fd < 0)
  22.     {
  23.         printf("open Failed:%d\n", fd);
  24.         goto _OVER_;
  25.     }

  27.     /**/
  28.     time(&cur_time);
  29.     pTm = localtime(&cur_time);
  30.     snprintf(date_buf, 50, "[%04d-%02d-%02d %02d:%02d:%02d]",
  31.                     pTm->tm_year + 1900,
  32.                     pTm->tm_mon + 1,
  33.                     pTm->tm_mday,
  34.                     pTm->tm_hour,
  35.                     pTm->tm_min,
  36.                     pTm->tm_sec);
  37.     /**/
  38.     ret_val = write(fd, date_buf, strlen(date_buf));
  39.     if(ret_val != (int)strlen(date_buf))
  40.     {
  41.         printf("write Failed:%d\n", ret_val);
  42.         goto _OVER_;
  43.     }
  44.     
  45.     /**/
  46.     ret_val = write(fd, pBuffer, data_len);
  47.     if(ret_val != data_len)
  48.     {
  49.         printf("write Failed:%d\n", ret_val);
  50.         goto _OVER_;
  51.     }

  53. _OVER_:
  54.     if(fd >= 0)
  55.     {
  56.         close(fd);
  57.     }
  58.     return ret_val;
  59. }

  61. /**/
  62. int main(int argc, char **argv)
  63. {
  64.     int i;
  65.     char buffer[20];
  66.     
  67.     for(i = 0; i < 20; i++)
  68.     {
  69.         snprintf(buffer, 20, "hello%dhello\n", i);        
  70.         Write_log_file((char *)"./a.txt", (char *)buffer, strlen(buffer));
  71.     }

  73.     return 0;
  74. }

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