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PROFIL (3) | C library functions | Unix Manual Pages | :man

NAME

profil - execution time profile

CONTENTS

Synopsis
Description
Bugs

SYNOPSIS

#include <unistd.h>

"int profil(u_short *"buf", size_t "bufsiz", size_t "offset", u_int "scale);

DESCRIPTION

This routine provides a means to find out in what areas your program spends most of its time. The argument buf points to bufsiz bytes of core. Every virtual 10 milliseconds, the user’s program counter (PC) is examined: offset is subtracted and the result is multiplied by scale and divided by 65536. If the resulting value is less than bufsiz, then the corresponding entry in buf is incremented. If buf is NULL, profiling is disabled.

"RETURN VALUE"

Zero is always returned.

BUGS

profil cannot be used on a program that also uses ITIMER_PROF itimers.

True kernel profiling provides more accurate results. Libc 4.4 contained a kernel patch providing a system call profil.

"CONFORMING TO"

Similar to a call in SVr4 (but not POSIX.1).

"SEE ALSO"

gprof(1), setitimer(2), signal(2), sigaction(2)


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