| 1 | /* Emulation of getpagesize() for systems that need it. */
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| 2 |
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| 3 | /*
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| 4 |
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| 5 | @deftypefn Supplemental int getpagesize (void)
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| 6 |
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| 7 | Returns the number of bytes in a page of memory. This is the
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| 8 | granularity of many of the system memory management routines. No
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| 9 | guarantee is made as to whether or not it is the same as the basic
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| 10 | memory management hardware page size.
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| 11 |
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| 12 | @end deftypefn
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| 13 |
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| 14 | BUGS
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| 15 |
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| 16 | Is intended as a reasonable replacement for systems where this
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| 17 | is not provided as a system call. The value of 4096 may or may
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| 18 | not be correct for the systems where it is returned as the default
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| 19 | value.
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| 20 |
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| 21 | */
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| 22 |
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| 23 | #ifndef VMS
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| 24 |
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| 25 | #include "config.h"
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| 26 |
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| 27 | #include <sys/types.h>
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| 28 | #ifdef HAVE_SYS_PARAM_H
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| 29 | #include <sys/param.h>
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| 30 | #endif
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| 31 |
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| 32 | #undef GNU_OUR_PAGESIZE
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| 33 | #if defined (HAVE_SYSCONF) && defined (HAVE_UNISTD_H)
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| 34 | #include <unistd.h>
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| 35 | #ifdef _SC_PAGESIZE
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| 36 | #define GNU_OUR_PAGESIZE sysconf(_SC_PAGESIZE)
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| 37 | #endif
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| 38 | #endif
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| 39 |
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| 40 | #ifndef GNU_OUR_PAGESIZE
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| 41 | # ifdef PAGESIZE
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| 42 | # define GNU_OUR_PAGESIZE PAGESIZE
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| 43 | # else /* no PAGESIZE */
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| 44 | # ifdef EXEC_PAGESIZE
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| 45 | # define GNU_OUR_PAGESIZE EXEC_PAGESIZE
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| 46 | # else /* no EXEC_PAGESIZE */
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| 47 | # ifdef NBPG
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| 48 | # define GNU_OUR_PAGESIZE (NBPG * CLSIZE)
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| 49 | # ifndef CLSIZE
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| 50 | # define CLSIZE 1
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| 51 | # endif /* CLSIZE */
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| 52 | # else /* no NBPG */
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| 53 | # ifdef NBPC
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| 54 | # define GNU_OUR_PAGESIZE NBPC
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| 55 | # else /* no NBPC */
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| 56 | # define GNU_OUR_PAGESIZE 4096 /* Just punt and use reasonable value */
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| 57 | # endif /* NBPC */
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| 58 | # endif /* NBPG */
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| 59 | # endif /* EXEC_PAGESIZE */
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| 60 | # endif /* PAGESIZE */
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| 61 | #endif /* GNU_OUR_PAGESIZE */
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| 62 |
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| 63 | int
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| 64 | getpagesize ()
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| 65 | {
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| 66 | return (GNU_OUR_PAGESIZE);
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| 67 | }
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| 68 |
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| 69 | #else /* VMS */
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| 70 |
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| 71 | #if 0 /* older distributions of gcc-vms are missing <syidef.h> */
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| 72 | #include <syidef.h>
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| 73 | #endif
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| 74 | #ifndef SYI$_PAGE_SIZE /* VMS V5.4 and earlier didn't have this yet */
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| 75 | #define SYI$_PAGE_SIZE 4452
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| 76 | #endif
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| 77 | extern unsigned long lib$getsyi(const unsigned short *,...);
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| 78 |
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| 79 | int getpagesize ()
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| 80 | {
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| 81 | long pagsiz = 0L;
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| 82 | unsigned short itmcod = SYI$_PAGE_SIZE;
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| 83 |
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| 84 | (void) lib$getsyi (&itmcod, (void *) &pagsiz);
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| 85 | if (pagsiz == 0L)
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| 86 | pagsiz = 512L; /* VAX default */
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| 87 | return (int) pagsiz;
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| 88 | }
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| 89 |
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| 90 | #endif /* VMS */
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