Annotated edit history of
profil(3) version 1, including all changes.
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perry |
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PROFIL |
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!!!PROFIL |
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NAME |
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SYNOPSIS |
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DESCRIPTION |
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RETURN VALUE |
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BUGS |
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CONFORMING TO |
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SEE ALSO |
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---- |
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!!NAME |
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profil - execution time profile |
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!!SYNOPSIS |
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__#include __ |
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__int profil(u_short *__''buf''__, size_t__ |
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''bufsiz''__, size_t__ ''offset''__, u_int__ |
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''scale''__);__ |
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!!DESCRIPTION |
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This routine provides a means to find out in what areas your |
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program spends most of its time. The argument ''buf'' |
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points to ''bufsiz'' bytes of core. Every virtual 10 |
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milliseconds, the user's program counter (PC) is examined: |
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''offset'' is subtracted and the result is multiplied by |
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''scale'' and divided by 65536. If the resulting value is |
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less than ''bufsiz'', then the corresponding entry in |
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''buf'' is incremented. If ''buf'' is NULL, profiling |
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is disabled. |
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!!RETURN VALUE |
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Zero is always returned. |
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!!BUGS |
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__profil__ cannot be used on a program that also uses |
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__ITIMER_PROF__ itimers. |
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True kernel profiling provides more accurate results. Libc |
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4.4 contained a kernel patch providing a system call |
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profil. |
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!!CONFORMING TO |
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Similar to a call in SVr4 (but not POSIX.1). |
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!!SEE ALSO |
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gprof(1), setitimer(2), signal(2), |
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sigaction(2) |
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---- |
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