CAP_SYSLOG(3)

NAME
cap_syslog, cap_vsyslog, cap_openlog, cap_closelog, cap_setlogmask - library for syslog in capability mode

LIBRARY
libcap_syslog

SYNOPSIS
#include <libcasper.h>
#include <casper/cap_syslog.h>
void
cap_syslog(cap_channel_t *chan, int pri, const char *fmt, ...);
void
cap_vsyslog(cap_channel_t *chan, int priority, const char *fmt, va_list ap);
void
cap_openlog(cap_channel_t *chan, const char *ident, int logopt, int facility);
void
cap_closelog(cap_channel_t *chan);
int
cap_setlogmask(cap_channel_t *chan, int maskpri);

DESCRIPTION
The functions cap_syslog() cap_vsyslog() cap_openlog() cap_closelog() cap_setlogmask() are respectively equivalent to syslog(3), vsyslog(3), openlog(3), closelog(3), setlogmask(3) except that the connection to the system.syslog service needs to be provided.

All of these functions are reentrant but not thread-safe. That is, they may be called from separate threads only with different cap_channel_t arguments or with synchronization.

EXAMPLES
The following example first opens a capability to casper and then uses this capability to create the system.syslog casper service to log messages.

    cap_channel_t *capcas, *capsyslog;
    /* Open capability to Casper. */
    capcas = cap_init();
    if (capcas == NULL)
    	err(1, "Unable to contact Casper");
    /* Enter capability mode sandbox. */
    if (cap_enter() < 0 && errno != ENOSYS)
    	err(1, "Unable to enter capability mode");
    /* Use Casper capability to create capability to the system.syslog service. */
    capsyslog = cap_service_open(capcas, "system.syslog");
    if (capsyslog == NULL)
    	err(1, "Unable to open system.syslog service");
    /* Close Casper capability, we don't need it anymore. */
    cap_close(capcas);
    /* Let's log something. */
    cap_syslog(capsyslog, LOG_NOTICE, "System logs from capability mode.");

SEE ALSO
cap_enter(2), closelog(3), err(3), openlog(3), setlogmask(3), syslog(3), vsyslog(3), capsicum(4), nv(9)

HISTORY
The cap_syslog service first appeared in FreeBSD 10.3.

AUTHORS
Mariusz Zaborski <oshogbo@FreeBSD.org>