RedHat 9 (Linux i386) - man page for profil (redhat section 3)

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PROFIL(3)			    Linux Programmer's Manual				PROFIL(3)

NAME
       profil - execution time profile

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  cor-
       responding 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)

Linux 2.0				    1993-07-23					PROFIL(3)
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