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(_STAT_VER, _MKNOD_VER): New macros. (__xstat, __fxstat, __lxstat, __xmknod): Declare new functions. [__GNUC__] (stat, fstat, lstat, mknod): Define these (and __ names) as extern inline's calling the x' functions.

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Roland McGrath 1996-01-18 00:10:56 +00:00
parent af8488a871
commit c59928df4d
1 changed files with 61 additions and 0 deletions
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61
io/sys/stat.h
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@ -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 */