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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>
     #include <sys/gmon.h>

     void
     moncontrol(int mode);

     void
     monstartup(u_long lowpc, u_long highpc);

DESCRIPTION
     An executable program compiled using the -pg option to cc(1) automatically 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 results.

     The moncontrol() function 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 histogram 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 call-
     ing monstartup() with the range of addresses to be profiled.  The lowpc and highpc arguments
     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().

ENVIRONMENT
     The following environment variables affect the execution of moncontrol:

     PROFIL_USE_PID  If set, the pid of the process is inserted into the filename.

FILES
     progname.gmon  execution data file

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

BSD					  June 14, 2004 				      BSD
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