profil3
Execution time profile
Usage
#include <unistd.h>
int profil(unsigned short *buf, size_t bufsiz, size_t offset, unsigned int scale);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
profil():
Since glibc 2.21:
_DEFAULT_SOURCE
In glibc 2.19 and 2.20:
_DEFAULT_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
Up to and including glibc 2.19:
_BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
Library
Standard C library (libc, -lc)
Overview
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.
Attributes
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
| profil() | Thread safety | MT-Unsafe |
Releases
15 releases since Debian 2.1 (Slink); the text changed 13 times.