source: rtems/cpukit/libnetworking/lib/syslog.c @ 430f6ff

/*
 * RTEMS version of syslog and associated routines
 *
 * $Id$
 */

#include <rtems.h>
#include <stdio.h>
#include <stdarg.h>
#include <errno.h>
#include <syslog.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>

#include <unistd.h>

static int LogStatus = LOG_CONS;
static const char *LogTag = "syslog";
static int LogFacility = LOG_USER;
static int LogMask = 0xff;

static int LogFd = -1;
static rtems_id LogSemaphore;
extern struct in_addr rtems_bsdnet_log_host_address;

#define SYSLOG_PORT     514

void
syslog (int pri, const char *fmt, ...)
{
        va_list ap;

        va_start (ap, fmt);
        vsyslog (pri, fmt, ap);
        va_end (ap);
}

/*
 * FIXME: Should cbuf be static?  It could be if we put the mutex
 *        around the entire body of this routine.  Then we wouldn't
 *        have to worry about blowing stacks with a local variable
 *        that large.  Could make cbuf bigger, too.
 */
void
vsyslog (int pri, const char *fmt, va_list ap)
{
        int cnt;
        char *cp;
        char *msgp, cbuf[200];
        int sent;

        if (pri & ~(LOG_PRIMASK|LOG_FACMASK)) {
                syslog (LOG_ERR|LOG_CONS|LOG_PERROR|LOG_PID,
                                                                "syslog: unknown facility/priority: %#x", pri);
                pri &= LOG_PRIMASK|LOG_FACMASK;
        }

        if (!(LOG_MASK(LOG_PRI(pri)) & LogMask))
                return;

        if ((pri & LOG_FACMASK) == 0)
                pri |= LogFacility;

        cnt = sprintf (cbuf, "<%d>", pri);
        cp = msgp = cbuf + cnt;
        if (LogTag) {
                const char *lp = LogTag;
                while ((*cp = *lp++) != '\0')
                        cp++;
        }
        if (LogStatus & LOG_PID) {
                rtems_id tid;
                rtems_task_ident (RTEMS_SELF, 0, &tid);
                cnt = sprintf (cp, "[%#lx]", (unsigned long)tid);
                cp += cnt;
        }
        if (LogTag) {
                *cp++ = ':';
                *cp++ = ' ';
        }
        cnt = vsprintf (cp, fmt, ap);
        cnt += cp - cbuf;
        if (cbuf[cnt-1] == '\n')
                cbuf[--cnt] = '\0';

        if (LogStatus & LOG_PERROR)
                printf ("%s\n", cbuf);

        /*
         * Grab the mutex
         */
        sent = 0;
        if ((rtems_bsdnet_log_host_address.s_addr != INADDR_ANY)
         && (LogFd >= 0)
         && (rtems_semaphore_obtain (LogSemaphore, RTEMS_WAIT, RTEMS_NO_TIMEOUT) == RTEMS_SUCCESSFUL)) {
                /*
                 * Set the destination address/port
                 */
                struct sockaddr_in farAddress;
                farAddress.sin_family = AF_INET;
                farAddress.sin_port = htons (SYSLOG_PORT);
                farAddress.sin_addr = rtems_bsdnet_log_host_address;
                memset (farAddress.sin_zero, '\0', sizeof farAddress.sin_zero);

                /*
                 * Send the message
                 */
                if (sendto (LogFd, cbuf, cnt, 0, (struct sockaddr *)&farAddress, sizeof farAddress) >= 0)
                        sent = 1;
                rtems_semaphore_release (LogSemaphore);
        }
        if (!sent && (LogStatus & LOG_CONS) && !(LogStatus & LOG_PERROR))
                printf ("%s\n", msgp);
}

void
openlog (const char *ident, int logstat, int logfac)
{
        rtems_status_code sc;
        struct sockaddr_in myAddress;

        if (ident != NULL)
                LogTag = ident;
        LogStatus = logstat;
        if (logfac != 0 && (logfac & ~LOG_FACMASK) == 0)
                LogFacility = logfac;

        /*
         * Create the socket
         */
        if ((LogFd = socket (AF_INET, SOCK_DGRAM, 0)) < 0) {
                printf ("Can't create syslog socket: %d\n", errno);
                return;
        }

        /*
         * Bind socket to name
         */
        myAddress.sin_family = AF_INET;
        myAddress.sin_addr.s_addr = INADDR_ANY;
        myAddress.sin_port = 0;
        memset (myAddress.sin_zero, '\0', sizeof myAddress.sin_zero);
        if (bind (LogFd, (struct sockaddr *)&myAddress, sizeof (myAddress)) < 0) {
                close (LogFd);
                LogFd = -1;
                printf ("Can't bind syslog socket: %d\n", errno);
                return;
        }

        /*
         * Create the mutex
         */
        sc = rtems_semaphore_create (rtems_build_name('s', 'L', 'o', 'g'),
                                        1,
                                        RTEMS_PRIORITY |
                                                RTEMS_BINARY_SEMAPHORE |
                                                RTEMS_INHERIT_PRIORITY |
                                                RTEMS_NO_PRIORITY_CEILING |
                                                RTEMS_LOCAL,
                                        0,
                                        &LogSemaphore);
        if (sc != RTEMS_SUCCESSFUL) {
                printf ("Can't create syslog semaphore: %d\n", sc);
                close (LogFd);
                LogFd = -1;
        }
}

void
closelog(void)
{
        if (LogFd >= 0) {
                close (LogFd);
                LogFd = -1;
                rtems_semaphore_delete (LogSemaphore);
        }
}

int
setlogmask (int pmask)
{
        int omask;

        omask = LogMask;
        if (pmask != 0)
                LogMask = pmask;
        return (omask);
}