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If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner] .TH posix_madvise 3C "14 Jul 2008" "SunOS 5.11" "Standard C Library Functions" .SH NAME posix_madvise \- memory advisory information .SH SYNOPSIS .LP .nf #include \fBint\fR \fBposix_madvise\fR(\fBvoid *\fR\fIaddr\fR, \fBsize_t\fR \fIlen\fR, \fBint\fR \fIadvice\fR); .fi .SH DESCRIPTION .sp .LP The \fBposix_madvise()\fR function advises the system on the expected behavior of the application with respect to the data in the memory starting at address \fIaddr\fR, and continuing for \fIlen\fR bytes. The system may use this information to optimize handling of the specified data. The \fBposix_madvise()\fR function has no effect on the semantics of access to memory in the specified range, although it may affect the performance of access. .sp .LP The advice to be applied to the memory range is specified by the \fIadvice\fR parameter and may be one of the following values: .sp .ne 2 .mk .na \fB\fBPOSIX_MADV_NORMAL\fR\fR .ad .RS 25n .rt Specifies that the application has no advice to give on its behavior with respect to the specified range. It is the default characteristic if no advice is given for a range of memory. .RE .sp .ne 2 .mk .na \fB\fBPOSIX_MADV_SEQUENTIAL\fR\fR .ad .RS 25n .rt Specifies that the application expects to access the specified range sequentially from lower addresses to higher addresses. .RE .sp .ne 2 .mk .na \fB\fBPOSIX_MADV_RANDOM\fR\fR .ad .RS 25n .rt Specifies that the application expects to access the specified range in a random order. .RE .sp .ne 2 .mk .na \fB\fBPOSIX_MADV_WILLNEED\fR\fR .ad .RS 25n .rt Specifies that the application expects to access the specified range in the near future. .RE .sp .ne 2 .mk .na \fB\fBPOSIX_MADV_DONTNEED\fR\fR .ad .RS 25n .rt Specifies that the application expects that it will not access the specified range in the near future. .RE .sp .LP These values are defined in \fB\fR .SH RETURN VALUES .sp .LP Upon successful completion, \fBposix_madvise()\fR returns zero. Otherwise, an error number is returned to indicate the error. .SH ERRORS .sp .LP The \fBposix_madvise()\fR function will fail if: .sp .ne 2 .mk .na \fB\fBEINVAL\fR\fR .ad .RS 10n .rt The value of \fIadvice\fR is invalid. .RE .sp .ne 2 .mk .na \fB\fBENOMEM\fR\fR .ad .RS 10n .rt Addresses in the range starting at \fIaddr\fR and continuing for \fIlen\fR bytes are partly or completely outside the range allowed for the address space of the calling process. .RE .sp .LP The \fBposix_madvise()\fR function may fail if: .sp .ne 2 .mk .na \fB\fBEINVAL\fR\fR .ad .RS 10n .rt The value of \fIlen\fR is zero. .RE .SH ATTRIBUTES .sp .LP See \fBattributes\fR(5) for descriptions of the following attributes: .sp .sp .TS tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) . ATTRIBUTE TYPEATTRIBUTE VALUE _ Interface StabilityCommitted _ MT-LevelMT-Safe _ StandardSee \fBstandards\fR(5). .TE .SH SEE ALSO .sp .LP \fBmmap\fR(2), \fBmadvise\fR(3C), posix_madvise(3C), \fBattributes\fR(5), \fBstandards\fR(5)