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Recipe 9.34 Writing Log Entries via C
9.34.1 Problem
You want
to add information to the system log from a C program.
9.34.2 Solution
Use the system library functions
openlog , syslog, and
closelog (see The syslog API):
syslog-demo.c:
#define _GNU_SOURCE /* for basename( ) in <string.h> */
#include <syslog.h>
#include <string.h>
int count = 0;
char *host = "some-machine ";
int main(int argc, char *argv[]) {
openlog(basename(argv[0]), LOG_PID, LOG_LOCAL3);
syslog(LOG_WARNING, "%d connection attempts from %s", count, host);
syslog(LOG_AUTHPRIV|LOG_ERR, "intruder alert!");
syslog(LOG_ERR, "can't open configuration file: %m");
closelog( );
return(0);
}
9.34.3 Discussion
Like Perl scripts [Recipe 9.33], C programs can pass
the %m format specifier to
syslog to include system
error messages, corresponding to
strerror(errno). Be sure to use
%m only when a system error has occurred, to avoid
misleading messages.
9.34.4 See Also
syslog(3).
