How can I direct messages from mac console.app to a log file? Post: 303038443

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Operating Systems OS X (Apple) How can I direct messages from mac console.app to a log file? Post 303038443 by dallas88 on Tuesday 3rd of September 2019 09:22:48 AM

09-03-2019

Registered User

How can I direct messages from mac console.app to a log file?

I'm trying to complete a bash script to capture if an external webcam is active in a video conference session. Some users will switch the camera to the built-in MAC camera. When this happens I want to trigger a set of events.

Things tried: reviewed the console.app to look for patterns on when the switch occurs in a user test & discovered messages indicating when the facetime camera changes state. I found this

Code:

019-08-31 22:59:57.387405 -0500 AppleCameraInterface default 0 22:59:57.387405 -0500 kernel AppleCamIn::power_on_hardware

2019-08-31 22:59:57.814936 -0500 AppleCameraAssistant default 438 22:59:57.814936 -0500 AppleCameraAssistant StartHardwareStream: creating frame receiver: 1280 x 720 (420v) [12.00,30.00]fps

2019-08-31 22:59:59.679037 -0500 AppleCameraAssistant default 438 22:59:59.679037 -0500 AppleCameraAssistant StopHardwareStream 2019-08-31 22:59:59.809252 -0500 AppleCameraInterface default 0 22:59:59.809252 -0500 kernel AppleCamIn::power_off_hardware

I thought I could simply grep these message from the console.app but it seems to be easier said than done. I thought i could find the msgs in one of the console report files but When I look at the various reports on the console, i'm not finding a report that contains the messages above. How can I direct messages from console.app to a log file versus manually copying and pasting the info from the console?or point me to a direction? Am I missing something?

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LEARN ABOUT FREEBSD

mac_is_present

MAC_IS_PRESENT(3)					   BSD Library Functions Manual 					 MAC_IS_PRESENT(3)

NAME

     mac_is_present -- report whether the running system has MAC support

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <sys/mac.h>

     int
     mac_is_present(const char *policyname);

DESCRIPTION

     The mac_is_present() function determines whether the currently-running kernel supports MAC for a given policy or not.  If policyname is
     non-NULL, the presence of the named policy (e.g. ``biba'', ``mls'', ``te'') is checked, otherwise the presence of any MAC policies at all is
     checked.

RETURN VALUES

     If the system supports the given MAC policy, the value 1 is returned.  If the specified MAC policy is not supported, the value 0 is returned.
     If an error occurs, the value -1 is returned.

ERRORS

     [EINVAL]		The value of policyname is not valid.

     [ENOMEM]		Insufficient memory was available to allocate internal storage.

SEE ALSO

     mac(3), mac_free(3), mac_get(3), mac_prepare(3), mac_set(3), mac_text(3), mac(4), mac(9)

HISTORY

     Support for Mandatory Access Control was introduced in FreeBSD 5.0 as part of the TrustedBSD Project.

BSD
								   July 7, 2006 							       BSD