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86 lines
2.6 KiB
Groff
86 lines
2.6 KiB
Groff
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.\"
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.\" $Id: setdebug.2,v 1.1 1997/02/27 07:32:15 gdr Exp $
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.\"
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.TH SETDEBUG 2 "19 January 1997" GNO "System Calls"
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.SH NAME
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.BR setdebug
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\- set kernel debugging output options
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.SH SYNOPSIS
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#include <gno/gno.h>
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.sp 1
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int
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\fBsetdebug\fR(int \fIoptions\fR);
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.SH DESCRIPTION
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.BR setdebug
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enables and disables various debugging routines built into the kernel.
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The routines display useful debugging information to standard error (except
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for
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.BR dbgSIG ,
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see BUGS). Debug output is enabled by setting the corresponding bit in
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.IR options ,
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according to the following table. To turn off all debugging output,
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.IR options
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should be set to zero. The various debug options are #defined in
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<gno/gno.h>.
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.IP \fBdbgGSOS\fR
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When this bit is set, call numbers will be printed out for any GS/OS
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or ORCA/Shell calls that are made.
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The number is printed in hexadecimal format and is prefixed with a '$'
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character. For this and the other GS/OS call debug options, the entire
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call sequence is enclosed in parenthesis '()' to ease tracing multiple
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levels of calls.
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.IP \fBdbgPATH\fR
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If this flag is set, every time a filename argument to a GS/OS or shell
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call is fully expanded the expanded version is displayed as follows:
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.nf
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EP: <fullpath>
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.fi
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.IP \fBdbgERROR\fR
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For every GS/OS call that is made, if an error occurs the error code is
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printed in inverse lettering in hexadecimal format. The code is prefixed
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with a '#' to distinguish the error code from a call code on terminals
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that do not support inverse mode. If no error occurs on the call, no code
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is printed. This option has no effect unless
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.BR dbgGSOS
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is also enabled.
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.IP \fBdbgSIG\fR
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This flag enables signal tracing. Each time a signal is sent, whether by
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.BR kill (2),
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job control, or keyboard, the signal number and target process is displayed.
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The format is:
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.nf
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kill (-\fIsignum\fR): \fIpid\fR: \fItpid\fR
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.fi
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.IP \fBdbgSYSCALL\fR
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The parameter lists to common system calls are displayed by this option
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flag. The actual format of the output varies from call to call. The calls
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that currently support this flag are
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.BR _execve (2),
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.BR fork (2),
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.BR settpgrp (2),
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.BR tcnewpgrp (2),
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and
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.BR tctpgrp (2).
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.IP \fBdbgPBLOCK\fR
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The memory addresses of GS/OS and ORCA/Shell parameter parameter blocks
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are printed for each call. As with
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.BR dbgERROR ,
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this option has no effect unless
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.BR dbgGSOS
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is also enabled.
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.SH RETURN VALUE
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.BR setdebug
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returns the previous value of the debug
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.IR options
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word.
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.SH BUGS
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Due to problems associated with signals that are sent during process
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termination,
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.BR dgbSIG
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prints its information to standard output instead of standard error.
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.SH SEE ALSO
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fork (2),
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execve (2),
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ioctl (2),
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kill (2)
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