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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | STANDARDS | HISTORY | BUGS | SEE ALSO | COLOPHON |
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profil(3) Library Functions Manual profil(3)
profil - execution time profile
Standard C library (libc, -lc)
#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)
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.
Zero is always returned.
For an explanation of the terms used in this section, see
attributes(7).
┌───────────────────────────────────┬───────────────┬───────────┐
│ Interface │ Attribute │ Value │
├───────────────────────────────────┼───────────────┼───────────┤
│ profil() │ Thread safety │ MT-Unsafe │
└───────────────────────────────────┴───────────────┴───────────┘
None.
Similar to a call in SVr4.
profil() cannot be used on a program that also uses ITIMER_PROF
interval timers (see setitimer(2)).
True kernel profiling provides more accurate results.
gprof(1), sprof(1), setitimer(2), sigaction(2), signal(2)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.9.1.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2024-06-26. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
[email protected]
Linux man-pages 6.9.1 2024-05-02 profil(3)
Pages that refer to this page: syscalls(2), unimplemented(2)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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