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MONCONTROL(3) BSD Library Functions Manual MONCONTROL(3)
moncontrol, monstartup -- control execution profile
Standard C Library (libc, -lc)
monstartup(u_long lowpc, u_long highpc);
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
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().
The following environment variables affect the execution of moncontrol:
PROFIL_USE_PID If set, the pid of the process is inserted into the filename.
progname.gmon execution data file
cc(1), gprof(1), profil(2), clocks(7)
BSD June 14, 2004 BSD
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