diff options
Diffstat (limited to 'usr/src/uts/common/sys/mman.h')
| -rw-r--r-- | usr/src/uts/common/sys/mman.h | 170 |
1 files changed, 93 insertions, 77 deletions
diff --git a/usr/src/uts/common/sys/mman.h b/usr/src/uts/common/sys/mman.h index 0d49a2ff4d..66c22a1f28 100644 --- a/usr/src/uts/common/sys/mman.h +++ b/usr/src/uts/common/sys/mman.h @@ -26,6 +26,7 @@ * Copyright 2008 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. * Copyright 2015 Joyent, Inc. All rights reserved. + * Copyright 2022 Oxide Computer Company */ /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */ @@ -46,6 +47,15 @@ #include <sys/feature_tests.h> +/* + * <sys/mman.h> has had a bit of a tortured symbol visibility history. In + * particular, when things were honored under __EXTENSIONS__ or not in the past + * wasn't very consistent. As this was not a header that was part of ISO-C it + * traditionally just checked around XOPEN/POSIX related feature tests. This + * makes the use of the standard _STRICT_POSIX something that actually is more + * restrictive than previously was used. + */ + #ifdef __cplusplus extern "C" { #endif @@ -68,7 +78,7 @@ extern "C" { #define PROT_EXEC 0x4 /* pages can be executed */ #ifdef _KERNEL -#define PROT_USER 0x8 /* pages are user accessable */ +#define PROT_USER 0x8 /* pages are user accessible */ #define PROT_ZFOD (PROT_READ | PROT_WRITE | PROT_EXEC | PROT_USER) #define PROT_ALL (PROT_READ | PROT_WRITE | PROT_EXEC | PROT_USER) #endif /* _KERNEL */ @@ -93,25 +103,19 @@ extern "C" { #define MAP_TEXT 0x400 /* map code segment */ #define MAP_INITDATA 0x800 /* map data segment */ +/* + * Internal to the kernel, extensions to mmap flags. + */ #ifdef _KERNEL #define _MAP_TEXTREPL 0x1000 #define _MAP_RANDOMIZE 0x2000 #endif /* _KERNEL */ -#if (_POSIX_C_SOURCE <= 2) && !defined(_XPG4_2) -/* these flags are used by memcntl */ -#define PROC_TEXT (PROT_EXEC | PROT_READ) -#define PROC_DATA (PROT_READ | PROT_WRITE | PROT_EXEC) -#define SHARED 0x10 -#define PRIVATE 0x20 -#define VALID_ATTR (PROT_READ|PROT_WRITE|PROT_EXEC|SHARED|PRIVATE) -#endif /* (_POSIX_C_SOURCE <= 2) && !defined(_XPG4_2) */ - -#if (_POSIX_C_SOURCE <= 2) || defined(_XPG4_2) -#ifdef _KERNEL -#define PROT_EXCL 0x20 -#endif /* _KERNEL */ - +/* + * Extensions to mmap flags. These are available in the default compilation + * environment, but not in a strict environment. + */ +#if !defined(_STRICT_POSIX) #define _MAP_LOW32 0x80 /* force mapping in lower 4G of address space */ #define MAP_32BIT _MAP_LOW32 @@ -125,10 +129,9 @@ extern "C" { * unless the MAP_FIXED flag is given. */ #define _MAP_NEW 0x80000000 /* users should not need to use this */ -#endif /* (_POSIX_C_SOURCE <= 2) */ +#endif /* !defined(_STRICT_POSIX) */ - -#if !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__) +#if !defined(_STRICT_POSIX) /* External flags for mmapobj syscall (Exclusive of MAP_* flags above) */ #define MMOBJ_PADDING 0x10000 #define MMOBJ_INTERPRET 0x20000 @@ -190,7 +193,7 @@ typedef struct mmapobj_result32 { } mmapobj_result32_t; #endif /* defined(_KERNEL) || defined(_SYSCALL32) */ #endif /* !defined(_ASM) */ -#endif /* !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__) */ +#endif /* !defined(_STRICT_POSIX) */ #if !defined(_ASM) && !defined(_KERNEL) /* @@ -223,34 +226,50 @@ typedef struct mmapobj_result32 { #endif /* - * Except for old binaries mmap() will return the resultant - * address of mapping on success and (caddr_t)-1 on error. + * Except for old binaries mmap() will return the resultant address of mapping + * on success and (void *)-1 on error. illumos traditionally used a 'caddr_t' + * instead of a void * and did not require certain addresses to be const. + * + * Note, the following group of symbols are always visible since we have always + * exposed them and they appear to have been defined in most relevant versions + * of the specifications. While these are not strictly defined in ISO C, this + * header isn't a part of it and it isn't our job to guard against that. */ -#if (_POSIX_C_SOURCE > 2) || defined(_XPG4_2) extern void *mmap(void *, size_t, int, int, int, off_t); extern int munmap(void *, size_t); extern int mprotect(void *, size_t, int); extern int msync(void *, size_t, int); -#if (!defined(_XPG4_2) || (_POSIX_C_SOURCE > 2)) || defined(__EXTENSIONS__) -extern int mlock(const void *, size_t); -extern int munlock(const void *, size_t); -#endif /* (!defined(_XPG4_2) || (_POSIX_C_SOURCE > 2))... */ -/* transitional large file interface version */ + #if defined(_LARGEFILE64_SOURCE) && !((_FILE_OFFSET_BITS == 64) && \ !defined(__PRAGMA_REDEFINE_EXTNAME)) extern void *mmap64(void *, size_t, int, int, int, off64_t); -#endif /* _LARGEFILE64_SOURCE... */ -#else /* (_POSIX_C_SOURCE > 2) || defined(_XPG4_2) */ -extern caddr_t mmap(caddr_t, size_t, int, int, int, off_t); -extern int munmap(caddr_t, size_t); -extern int mprotect(caddr_t, size_t, int); -extern int msync(caddr_t, size_t, int); -extern int mlock(caddr_t, size_t); -extern int munlock(caddr_t, size_t); +#endif /* _LARGEFILE64_SOURCE... */ + +/* + * These functions were all part of the older POSIX realtime suite and didn't + * make it into XPG until v5. + */ + +#if !defined(_STRICT_POSIX) || (_POSIX_C_SOURCE > 2) || defined(_XPG5) +extern int mlock(const void *, size_t); +extern int munlock(const void *, size_t); +extern int mlockall(int); +extern int munlockall(void); +extern int shm_open(const char *, int, mode_t); +extern int shm_unlink(const char *); +#endif /* !_STRICT_POSIX || _POSIX_C_SOURCE > 2 || _XPG5 */ + +#if !defined(_STRICT_POSIX) || defined(_XPG6) +extern int posix_madvise(void *, size_t, int); +#endif + +/* + * The following are extensions that we have added. + */ +#if !defined(_STRICT_POSIX) extern int mincore(caddr_t, size_t, char *); -extern int memcntl(caddr_t, size_t, int, caddr_t, int, int); -extern int madvise(caddr_t, size_t, int); -#if !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__) +extern int memcntl(void *, size_t, int, void *, int, int); +extern int madvise(void *, size_t, int); extern int getpagesizes(size_t *, int); extern int getpagesizes2(size_t *, int); extern int mmapobj(int, uint_t, mmapobj_result_t *, uint_t *, void *); @@ -259,52 +278,34 @@ extern int mmapobj(int, uint_t, mmapobj_result_t *, uint_t *, void *); extern int meminfo(const uint64_t *, int, const uint_t *, int, uint64_t *, uint_t *); #endif /* defined(_INT64_TYPE) */ -#endif /* !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__) */ -/* transitional large file interface version */ -#ifdef _LARGEFILE64_SOURCE -extern caddr_t mmap64(caddr_t, size_t, int, int, int, off64_t); -#endif -#endif /* (_POSIX_C_SOURCE > 2) || defined(_XPG4_2) */ - -#if (!defined(_XPG4_2) || (_POSIX_C_SOURCE > 2)) || defined(__EXTENSIONS__) -extern int mlockall(int); -extern int munlockall(void); -extern int shm_open(const char *, int, mode_t); -extern int shm_unlink(const char *); -#endif +#endif /* !defined(_STRICT_POSIX) */ -#if !defined(__XOPEN_OR_POSIX) || defined(_XPG6) || defined(__EXTENSIONS__) -extern int posix_madvise(void *, size_t, int); -#endif /* mmap failure value */ #define MAP_FAILED ((void *) -1) - #endif /* !_ASM && !_KERNEL */ -#if !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__) +#if !defined(_STRICT_POSIX) #if !defined(_ASM) /* * structure for memcntl hat advise operations. */ struct memcntl_mha { - uint_t mha_cmd; /* command(s) */ + uint_t mha_cmd; /* command(s) */ uint_t mha_flags; size_t mha_pagesize; }; #if defined(_SYSCALL32) struct memcntl_mha32 { - uint_t mha_cmd; /* command(s) */ + uint_t mha_cmd; /* command(s) */ uint_t mha_flags; size32_t mha_pagesize; }; #endif /* _SYSCALL32 */ #endif /* !defined(_ASM) */ -#endif /* !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__) */ -#if (_POSIX_C_SOURCE <= 2) && !defined(_XPG4_2) || defined(__EXTENSIONS__) /* * advice to madvise * @@ -322,9 +323,9 @@ struct memcntl_mha32 { #define MADV_ACCESS_MANY 8 /* many processes to access heavily */ #define MADV_PURGE 9 /* contents will be purged */ -#endif /* (_POSIX_C_SOURCE <= 2) && !defined(_XPG4_2) ... */ +#endif /* !defined(_STRICT_POSIX) */ -#if !defined(__XOPEN_OR_POSIX) || defined(_XPG6) || defined(__EXTENSIONS__) +#if !defined(_STRICT_POSIX) || defined(_XPG6) /* advice to posix_madvise */ /* these values must be kept in sync with the MADV_* values, above */ #define POSIX_MADV_NORMAL 0 /* MADV_NORMAL */ @@ -334,15 +335,41 @@ struct memcntl_mha32 { #define POSIX_MADV_DONTNEED 4 /* MADV_DONTNEED */ #endif -/* flags to msync */ +/* flags to msync, always visible to match the function */ #define MS_OLDSYNC 0x0 /* old value of MS_SYNC */ /* modified for UNIX98 compliance */ #define MS_SYNC 0x4 /* wait for msync */ #define MS_ASYNC 0x1 /* return immediately */ #define MS_INVALIDATE 0x2 /* invalidate caches */ -#if (_POSIX_C_SOURCE <= 2) && !defined(_XPG4_2) || defined(__EXTENSIONS__) -/* functions to mctl */ +#if !defined(_STRICT_POSIX) || (_POSIX_C_SOURCE > 2) || defined(_XPG5) +/* flags to mlockall */ +#define MCL_CURRENT 0x1 /* lock current mappings */ +#define MCL_FUTURE 0x2 /* lock future mappings */ +#endif /* !_STRICT_POSIX || _POSIX_C_SOURCE > 2 || _XPG5 */ + +/* + * The following flags are older variants used by memcntl that if more generally + * visible under more generous rules basically conflict all over the place due + * to the use of common words. As such, these retain their original feature + * guards, as weird as they may be. + */ +#if (_POSIX_C_SOURCE <= 2) && !defined(_XPG4_2) +#define SHARED 0x10 /* Use MEMCNTL_SHARED */ +#define PRIVATE 0x20 /* Use MEMCNTL_PRIVATE */ +#define VALID_ATTR (PROT_READ|PROT_WRITE|PROT_EXEC|SHARED|PRIVATE) +#endif /* (_POSIX_C_SOURCE <= 2) && !defined(_XPG4_2) */ + +#if !defined(_STRICT_POSIX) +/* these flags are used by memcntl */ +#define PROC_TEXT (PROT_EXEC | PROT_READ) +#define PROC_DATA (PROT_READ | PROT_WRITE | PROT_EXEC) +#define MEMCNTL_SHARED 0x10 +#define MENCNTL_PRIVATE 0x20 +#define MEMCNTL_VALID_ATTR (PROT_READ |PROT_WRITE |PROT_EXEC | \ + MEMCNTL_SHARED | MEMCNTL_PRIVATE) + +/* functions to memcntl */ #define MC_SYNC 1 /* sync with backing store */ #define MC_LOCK 2 /* lock pages in memory */ #define MC_UNLOCK 3 /* unlock pages from memory */ @@ -359,17 +386,6 @@ struct memcntl_mha32 { /* brk area and brk area itself */ #define MHA_MAPSIZE_STACK 0x4 /* set preferred page size */ /* processes main stack */ - -#endif /* (_POSIX_C_SOURCE <= 2) && !defined(_XPG4_2) ... */ - -#if (!defined(_XPG4_2) || (_POSIX_C_SOURCE > 2)) || defined(__EXTENSIONS__) -/* flags to mlockall */ -#define MCL_CURRENT 0x1 /* lock current mappings */ -#define MCL_FUTURE 0x2 /* lock future mappings */ -#endif /* (!defined(_XPG4_2) || (_POSIX_C_SOURCE)) || defined(__EXTENSIONS__) */ - -#if !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__) - /* definitions for meminfosys syscall */ #define MISYS_MEMINFO 0x0 @@ -420,7 +436,7 @@ typedef struct meminfo32 { /* maximum number of request types */ #define MAX_MEMINFO_REQ 31 -#endif /* !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__) */ +#endif /* !defined(_STRICT_POSIX) */ #ifdef __cplusplus } |