P_CANDEBUG(9)						   BSD Kernel Developer's Manual					     P_CANDEBUG(9)

NAME

     p_candebug -- determine debuggability of a process

SYNOPSIS

     #include <sys/param.h>
     #include <sys/proc.h>

     int
     p_candebug(struct thread *td, struct proc *p);

DESCRIPTION

     This function can be used to determine if a given process p is debuggable by the thread td.

SYSCTL VARIABLES

     The following sysctl(8) variables directly influence the behaviour of p_candebug():

     kern.securelevel
	     Debugging of the init process is not allowed if this variable is 1 or greater.

     security.bsd.unprivileged_proc_debug
	     Must be set to a non-zero value to allow unprivileged processes access to the kernel's debug facilities.

RETURN VALUES

     The p_candebug() function returns 0 if the process denoted by p is debuggable by thread td, or a non-zero error return value otherwise.

ERRORS

     [EACCESS]		The MAC subsystem denied debuggability.

     [EAGAIN]		Process p is in the process of being exec()'ed.

     [EPERM]		Thread td lacks super-user credentials and process p is executing a set-user-ID or set-group-ID executable.

     [EPERM]		Thread td lacks super-user credentials and process p's group set is not a subset of td's effective group set.

     [EPERM]		Thread td lacks super-user credentials and process p's user IDs do not match thread td's effective user ID.

     [EPERM]		Process p denotes the initial process initproc() and the sysctl(8) variable kern.securelevel is greater than zero.

     [ESRCH]		Process p is not visible to thread td as determined by cr_seeotheruids(9) or cr_seeothergids(9).

     [ESRCH]		Thread td has been jailed and process p does not belong to the same jail as td.

     [ESRCH]		The MAC subsystem denied debuggability.

SEE ALSO

     jail(2), sysctl(8), cr_seeothergids(9), cr_seeotheruids(9), mac(9), p_cansee(9), prison_check(9)

BSD
								 November 19, 2006							       BSD