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'\" te .\" Copyright (c) 2001, 2016, Oracle and/or its affiliates. All rights reserved. .TH getpagesizes 3C "23 May 2016" "Oracle Solaris 11.4" "Standard C Library Functions" .SH NAME getpagesizes \- get system supported page sizes .SH SYNOPSIS .LP .nf #include <sys/mman.h> \fBint\fR \fBgetpagesizes\fR(\fBsize_t\fR \fIpagesize\fR[\|], \fBint\fR \fInelem\fR); .fi .SH DESCRIPTION .sp .LP The \fBgetpagesizes()\fR function returns either the number of different page sizes supported by the system or the actual sizes themselves. When called with \fInelem\fR as 0 and pagesize as \fINULL\fR, \fBgetpagesizes()\fR returns the number of supported page sizes. Otherwise, up to \fInelem\fR page sizes are retrieved and assigned to successive elements of \fIpagesize\fR[\|]. The return value is the number of page sizes retrieved and set in \fIpagesize\fR[\|]. .sp .LP Note that if the \fBgetpagesizes()\fR function is called from a 32bit program, then the page sizes 4G or above will not be returned. To get information on larger page sizes, It is recommended to use a 64bit program. .SH RETURN VALUES .sp .LP Upon successful completion, the number of pagesizes supported or actually retrieved is returned. Otherwise, \(mi1 is returned and \fBerrno\fR is set to indicate the error. .SH ERRORS .sp .LP The \fBgetpagesizes()\fR function will fail if: .sp .ne 2 .mk .na \fB\fBEINVAL\fR\fR .ad .RS 10n .rt The \fInelem\fR argument is less than 0 or \fIpagesize\fR is \fINULL\fR but \fInelem\fR is non-zero. .RE .SH USAGE .sp .LP The \fBgetpagesizes()\fR function returns all the page sizes for which the hardware and system software provide support for the \fBmemcntl\fR(2) command \fBMC_HAT_ADVISE\fR. Not all processors support all page sizes or combinations of page sizes with equal efficiency. Applications programmers should take this into consideration when using \fBgetpagesizes()\fR. .SH ATTRIBUTES .sp .LP See \fBattributes\fR(7) for descriptions of the following attributes: .sp .TS tab( ) box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) . ATTRIBUTE TYPE ATTRIBUTE VALUE _ MT-Level MT-Safe .TE .sp .SH SEE ALSO .sp .LP \fBmemcntl\fR(2), \fBmmap\fR(2), \fBgetpagesize\fR(3C), \fBattributes\fR(7)