projects / deliverable / binutils-gdb.git / blame
| Commit | Line | Data |
|---|---|---|
| 252b5132 RH |
1 | /* Emulation of getpagesize() for systems that need it. */ |
| 2 | ||
| 3 | /* | |
| 4 | ||
| 99b58139 | 5 | @deftypefn Supplemental int getpagesize (void) |
| 252b5132 | 6 | |
| 39423523 DD |
7 | Returns the number of bytes in a page of memory. This is the |
| 8 | granularity of many of the system memory management routines. No | |
| 9 | guarantee is made as to whether or not it is the same as the basic | |
| 10 | memory management hardware page size. | |
| 252b5132 | 11 | |
| 39423523 | 12 | @end deftypefn |
| 252b5132 RH |
13 | |
| 14 | BUGS | |
| 15 | ||
| 16 | Is intended as a reasonable replacement for systems where this | |
| 17 | is not provided as a system call. The value of 4096 may or may | |
| 18 | not be correct for the systems where it is returned as the default | |
| 19 | value. | |
| 20 | ||
| 21 | */ | |
| 22 | ||
| 23 | #ifndef VMS | |
| 24 | ||
| 25 | #include "config.h" | |
| 26 | ||
| 27 | #include <sys/types.h> | |
| 28 | #ifdef HAVE_SYS_PARAM_H | |
| 29 | #include <sys/param.h> | |
| 30 | #endif | |
| 31 | ||
| 32 | #undef GNU_OUR_PAGESIZE | |
| 33 | #if defined (HAVE_SYSCONF) && defined (HAVE_UNISTD_H) | |
| 34 | #include <unistd.h> | |
| 35 | #ifdef _SC_PAGESIZE | |
| 36 | #define GNU_OUR_PAGESIZE sysconf(_SC_PAGESIZE) | |
| 37 | #endif | |
| 38 | #endif | |
| 39 | ||
| 40 | #ifndef GNU_OUR_PAGESIZE | |
| 41 | # ifdef PAGESIZE | |
| 42 | # define GNU_OUR_PAGESIZE PAGESIZE | |
| 43 | # else /* no PAGESIZE */ | |
| 44 | # ifdef EXEC_PAGESIZE | |
| 45 | # define GNU_OUR_PAGESIZE EXEC_PAGESIZE | |
| 46 | # else /* no EXEC_PAGESIZE */ | |
| 47 | # ifdef NBPG | |
| 48 | # define GNU_OUR_PAGESIZE (NBPG * CLSIZE) | |
| 49 | # ifndef CLSIZE | |
| 50 | # define CLSIZE 1 | |
| 51 | # endif /* CLSIZE */ | |
| 52 | # else /* no NBPG */ | |
| 53 | # ifdef NBPC | |
| 54 | # define GNU_OUR_PAGESIZE NBPC | |
| 55 | # else /* no NBPC */ | |
| 56 | # define GNU_OUR_PAGESIZE 4096 /* Just punt and use reasonable value */ | |
| 57 | # endif /* NBPC */ | |
| 58 | # endif /* NBPG */ | |
| 59 | # endif /* EXEC_PAGESIZE */ | |
| 60 | # endif /* PAGESIZE */ | |
| 61 | #endif /* GNU_OUR_PAGESIZE */ | |
| 62 | ||
| 63 | int | |
| 64 | getpagesize () | |
| 65 | { | |
| 66 | return (GNU_OUR_PAGESIZE); | |
| 67 | } | |
| 68 | ||
| 69 | #else /* VMS */ | |
| 70 | ||
| 71 | #if 0 /* older distributions of gcc-vms are missing <syidef.h> */ | |
| 72 | #include <syidef.h> | |
| 73 | #endif | |
| 74 | #ifndef SYI$_PAGE_SIZE /* VMS V5.4 and earlier didn't have this yet */ | |
| 75 | #define SYI$_PAGE_SIZE 4452 | |
| 76 | #endif | |
| 77 | extern unsigned long lib$getsyi(const unsigned short *,...); | |
| 78 | ||
| 79 | int getpagesize () | |
| 80 | { | |
| 81 | long pagsiz = 0L; | |
| 82 | unsigned short itmcod = SYI$_PAGE_SIZE; | |
| 83 | ||
| 84 | (void) lib$getsyi (&itmcod, (void *) &pagsiz); | |
| 85 | if (pagsiz == 0L) | |
| 86 | pagsiz = 512L; /* VAX default */ | |
| 87 | return (int) pagsiz; | |
| 88 | } | |
| 89 | ||
| 90 | #endif /* VMS */ |