diff options
| -rw-r--r-- | io/sys/stat.h | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/io/sys/stat.h b/io/sys/stat.h index 762e3ad..7ee76af 100644 --- a/io/sys/stat.h +++ b/io/sys/stat.h @@ -172,7 +172,68 @@ extern int mknod __P ((__const char *__path, /* Create a new FIFO named PATH, with permission bits MODE. */ extern int mkfifo __P ((__const char *__path, __mode_t __mode)); + +/* To allow the `struct stat' structure and the file type `mode_t' bits to + vary without changing shared library major version number, the `stat' + family of functions and `mknod' are in fact inline wrappers around calls + to `xstat', `fxstat', `lxstat', and `xmknod', which all take a leading + version-number argument designating the data structure and bits used. + <statbuf.h> defines _STAT_VER with the version number corresponding to + `struct stat' as defined in that file; and _MKNOD_VER with the version + number corresponding to the S_IF* macros defined therein. It is + arranged that when not inlined these function are always statically + linked; that way a dynamically-linked executable always encodes the + version number corresponding to the data structures it uses, so the `x' + functions in the shared library can adapt without needing to recompile + all callers. */ + +#ifndef _STAT_VER +#define _STAT_VER 0 +#endif +#ifndef _MKNOD_VER +#define _MKNOD_VER 0 +#endif + +/* Wrappers for stat and mknod system calls. */ +extern int __fxstat __P ((int __ver, int __fildes, + struct stat *__stat_buf)); +extern int __xstat __P ((int __ver, __const char *__filename, + struct stat *__stat_buf)); +extern int __lxstat __P ((int __ver, __const char *__filename, + struct stat *__stat_buf)); +extern int __xmknod __P ((int __ver, __const char *__path, + __mode_t __mode, __dev_t *__dev)); + +#if defined (__GNUC__) && __GNUC__ >= 2 +/* Inlined versions of the real stat and mknod functions. */ + +extern __inline__ int __stat (__const char *__path, struct stat *__statbuf) +{ return __xstat (_STAT_VER, __path, __statbuf); } +extern __inline__ int stat (__const char *__path, struct stat *__statbuf) +{ return __xstat (_STAT_VER, __path, __statbuf); } + +extern __inline__ int __lstat(__const char *__path, struct stat *__statbuf) +{ return __lxstat (_STAT_VER, __path, __statbuf); } +extern __inline__ int lstat(__const char *__path, struct stat *__statbuf) +{ return __lxstat (_STAT_VER, __path, __statbuf); } + +extern __inline__ int __fstat (int __fd, struct stat *__statbuf) +{ return __fxstat (_STAT_VER, __fd, __statbuf); } +extern __inline__ int fstat (int __fd, struct stat *__statbuf) +{ return __fxstat (_STAT_VER, __fd, __statbuf); } + +extern __inline__ int __mknod (__const char *__path, __mode_t __mode, + __dev_t __dev) +{ return __xmknod (_MKNOD_VER, __path, __mode, &__dev); } +#if defined(__USE_MISC) || defined(__USE_BSD) +extern __inline__ int mknod (__const char *__path, __mode_t __mode, + __dev_t __dev) +{ return __xmknod (_MKNOD_VER, __path, __mode, &__dev); } +#endif + +#endif __END_DECLS + #endif /* sys/stat.h */ |