LOG(7)

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LOG(7)

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log - ��

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�� log �� [��. strerr(1M), strace(1M)]. Log �� : �� , �� , � �� ioctl(2) �� , � �� , �� .

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�� strlog:

#include <sys/stropts.h>
#include <sys/strlog.h>
#include <sys/log.h>

strlog (mid, sid, level, flags, fmt, arg1, ...)
short mid, sid;
char level;
unsigned short flags;
char *fmt;
unsigned int arg1;

�� mid - �� , �� . �� sid �� , �� . �� level - �� , �� (�� ). �� flags �� :

SL_ERROR: �� , �� .
SL_TRACE: �� .
SL_FATAL: �� .
SL_NOTIFY: �� mail(1).

�� fmt - �� , �� printf(3S), �� %s, %e, %E, %g � %G �� . �� (arg1, ...) �� NLOGARGS (� �� 3).

�� 
�� log �� /dev/log �� clone(7). �� /dev/log �� log. �� log, �� I_STR �� ioctl(2) � �� , �� ioctl �� struct strioctl.

struct strioctl {                               
  int  ic_cmd;     /* ������� */            
  int  ic_timout;  /* ������� */            
  int  ic_len;     /* ����� ������ */       
  char *ic_dp;     /* ��������� �� ������ */
};

�� , �� , �� ic_cmd �� I_ERRLOG, � �� ic_len - 0, � � �� ic_dp NULL. �� , �� , �� ic_cmd �� I_TRCLOG, � �� ic_dp �� struct trace_ids, � � �� ic_len - �� .

struct trace_ids {
  short ti_mid;  
  short ti_sid;  
  char  ti_level;
};

�� , �� . �� strlog �� , �� , � �� . �� -1 � �� ti_mid, ti_sid, ti_level �� .

� �� .

�� , �� ioctl �� , �� , log �� , �� . �� getmsg(2).

�� struct log_ctl, � �� , ��, ��, �� , �� 1 �� 1970 �� .

struct log_ctl {                                      
  short mid;                                       
  short sid;                                       
  char  level;                                     
  short flags;                                     
  long  ltime;  /* ����� � ������ �� �������� */
  long  ttime;  /* ����� � �������� �� 1.01.1970 */
  long  seq_no; /* ���������� ����� */             
};

�� 1 �� 1970 �� , �� , � �� . �� : �� . �� .

�� - �� , �� , �� NLOGARGS ��, �� .

�� , �� , �� log. �� log_ctl �� level � flags, �� log. �� , �� , �� , �� NLOGARGS ��, �� .

�� I_ERRLOG �� I_TRCLOG, �� -�� , �� ENXIO. �� ENXIO ��, �� I_TRCLOG �� trace_ids, � �� I_STR ��. �� log �� , �� , �� .

��

�� :

     struct strioctl ioc;
     
     ic.ic_cmd = IERRLOG;
     ic.ic_timeout = 0;  /* ������� �� ��������� (15 �) */
     ic.ic_len = 0;
     ic.ic_dp = NULL;
     
     ioctl (log, I_STR, &ioc);

�� :

     struct strioctl ioc;
     struct trace_ids tid [2];
     
     tid[0].ti_mid = 2;
     tid[0].ti_sid = 0;
     tid[0].ti_level = 1;
     
     tid[1].ti_mid = 1002;
     tid[1].ti_sid = -1;     /* ����� */
     tid[1].ti_level = -1;   /* ����� */
     
     ic.ic_cmd = ITRCLOG;
     ic.ic_timeout = 0;
     ic.ic_len = 2 * sizeof (struct trace_ids);
     ic.ic_dp = (char *) tid;
     
     ioctl (log, I_STR, &ioc);

�� log (�� ):

     struct strbuf ctl, dat;
     struct log_ctl lc;
     char *message = "I am waiting for you";
     
     ctl.len = ctl.maxlen = sizeof (lc);
     ctl.buf = (char *) &lc;
     
     dat.len = dat.maxlen = strlen (message) + 1;
     dat.buf = message;
     
     lc.level = 0;
     lc.flags = SL_ERROR | SL_NOTIFY;
     
     putmsg (log, &ctl, &dat, 0);

��

/dev/log
<sys/stropts.h>
<sys/log.h>
<sys/strlog.h>

��. ��
strace(1M), strerr(1M), clone(7).
intro(2), getmsg(2), ioctl(2), putmsg(2) � �� .

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Designed by Andrey Novikov
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