daemons/t_syslog.c

/* t_syslog.c

   Demonstrate the use of syslog(3) to write arbitrary messages to
   the system log. Usage is as shown in usageError() below.
*/
#include <syslog.h>
#include "tlpi_hdr.h"

static void
usageError(const char *progName)
{
    fprintf(stderr, "Usage: %s [-p] [-e] [-l level] \"message\"\n", progName);
    fprintf(stderr, "    -p   log PID\n");
    fprintf(stderr, "    -e   log to stderr also\n");
    fprintf(stderr, "    -l   level (g=EMERG; a=ALERT; c=CRIT; e=ERR\n");
    fprintf(stderr, "                w=WARNING; n=NOTICE; i=INFO; d=DEBUG)\n");
    exit(EXIT_FAILURE);
}

int
main(int argc, char *argv[])
{
    int options = 0;
    int level = LOG_INFO;
    int opt;

    while ((opt = getopt(argc, argv, "l:pe")) != -1) {
        switch (opt) {
        case 'l':
            switch (optarg[0]) {
            case 'a': level = LOG_ALERT;        break;
            case 'c': level = LOG_CRIT;         break;
            case 'e': level = LOG_ERR;          break;
            case 'w': level = LOG_WARNING;      break;
            case 'n': level = LOG_NOTICE;       break;
            case 'i': level = LOG_INFO;         break;
            case 'd': level = LOG_DEBUG;        break;
            default:  cmdLineErr("Bad facility: %c\n", optarg[0]);
            }
            break;

        case 'p':
            options |= LOG_PID;
            break;

#if ! defined(__hpux) && ! defined(__sun)

        /* Not on HP-UX 11 or Solaris 8 */

        case 'e':
            options |= LOG_PERROR;
            break;
#endif

        default:
            fprintf(stderr, "Bad option\n");
            usageError(argv[0]);
        }
    }

    if (argc != optind + 1)
        usageError(argv[0]);

    openlog(argv[0], options, LOG_USER);
    syslog(LOG_USER | level, "%s", argv[optind]);
    closelog();

    exit(EXIT_SUCCESS);
}