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MONCONTROL(3)		 BSD Library Functions Manual		 MONCONTROL(3)

NAME
     moncontrol, monstartup -- control execution profile

LIBRARY
     Standard C	Library	(libc, -lc)

SYNOPSIS
     #include <sys/types.h>

     int
     moncontrol(int mode);

     int
     monstartup(u_long *lowpc, u_long *highpc);

DESCRIPTION
     An	executable program compiled using the -pg option to cc(1) automati-
     cally includes calls to collect statistics	for the	gprof(1) call-graph
     execution profiler.  In typical operation,	profiling begins at program
     startup and ends when the program calls exit.  When the program exits,
     the profiling data	are written to the file	progname.gmon, where progname
     is	the name of the	program, then gprof(1) can be used to examine the re-
     sults.

     moncontrol() selectively controls profiling within	a program.  When the
     program starts, profiling begins.	To stop	the collection of histogram
     ticks and call counts use moncontrol(0); to resume	the collection of his-
     togram ticks and call counts use moncontrol(1).  This feature allows the
     cost of particular	operations to be measured.  Note that an output	file
     will be produced on program exit regardless of the	state of moncontrol().

     Programs that are not loaded with -pg may selectively collect profiling
     statistics	by calling monstartup()	with the range of addresses to be pro-
     filed.  lowpc and highpc specify the address range	that is	to be sampled;
     the lowest	address	sampled	is that	of lowpc and the highest is just below
     highpc.  Only functions in	that range that	have been compiled with	the
     -pg option	to cc(1) will appear in	the call graph part of the output;
     however, all functions in that address range will have their execution
     time measured.  Profiling begins on return	from monstartup().

FILES
     progname.gmon  execution data file

SEE ALSO
     cc(1), gprof(1), profil(2), clocks(7)

BSD				 June 4, 1993				   BSD

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | FILES | SEE ALSO

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