| Rev | Author | # | Line |
|---|---|---|---|
| 2 | PerryLorier | 1 | |
| 1 | perry | 2 | !!NAME |
| 3 | |||
| 4 | |||
| 5 | getpagesize - get system page size | ||
| 6 | !!SYNOPSIS | ||
| 7 | |||
| 8 | |||
| 2 | PerryLorier | 9 | __#include <unistd.h>__ |
| 1 | perry | 10 | |
| 11 | |||
| 2 | PerryLorier | 12 | __size_t getpagesize(void);__ |
| 1 | perry | 13 | !!DESCRIPTION |
| 2 | PerryLorier | 14 | Return the number of bytes in a page. This is the system's page size, which is not necessarily the same as the hardware page size. |
| 1 | perry | 15 | |
| 16 | !!NOTES | ||
| 2 | PerryLorier | 17 | getpagesize(2) is implemented as a library function in DLL 4.4.1. Depending on what is defined when the library is compiled, this function returns __EXEC_PAGESIZE__ (set to 4096 in Linux 0.99.11), __NBPG__ (set to 4096 in Linux 0.99.11), or __NBPC__ (not defined in Linux 0.99.11 or DLL 4.4.1 libraries). |
| 1 | perry | 18 | |
| 19 | !!BUGS | ||
| 2 | PerryLorier | 20 | Depending on architecture and library version, this library call may do a system call or not. It may return a value different from that of the system call. For example, on a sun4 with libc5 this routine returns EXEC_PAGESIZE, which is 8192, and not PAGE_SIZE, which is 4096, or the result of the system call, which also is 4096. |
| 1 | perry | 21 | |
| 22 | !!CONFORMING TO | ||
| 2 | PerryLorier | 23 | SVr4, 4.4BSD (this call first appeared in 4.2BSD). |
| 1 | perry | 24 | |
| 25 | !!SEE ALSO | ||
| 2 | PerryLorier | 26 | sbrk(2), mmap(2) |
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