GCC option to get statvfs64 - c

Question

I am using statvfs function call on AIX. And using GCC compiler.
I would like statvfs call to resolve to statvfs64 by preprocessor.
Ex: In Solaris, using "-D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64" flags with gcc i am resolved to statvfs64.
Could you please help in getting the similar flags on AIX which resolves me to statvfs64 from statvfs.
Thanks & Regards,
Sivaram T

Answer 1

Thanks a lot for immediate response.
Unfortunately there is no "_LARGEFILE64_SOURCE" define on AIX include file.
I come to know the following options
"-maix64 -mpowerpc64" can resolve to the statvfs64. Not sure whether these are right to use or not.
Please find the following sys/statvfs.h file
=================================================
#ifndef _H_STATVFS
#define _H_STATVFS
#ifndef _H_STANDARDS
#include <standards.h>
#endif
#if _XOPEN_SOURCE_EXTENDED==1
#include <strict_stdtypes.h>
#ifndef _H_TYPES
#include <sys/types.h>
#endif
#include <end_strict_stdtypes.h>
#define _FSTYPSIZ 16
#ifdef _ALL_SOURCE
#include <sys/vmount.h>
#define FSTYPSIZ _FSTYPSIZ
#endif
/*
* statvfs system call return structure
*/
struct statvfs {
ulong_t f_bsize; /* preferred file system block size */
ulong_t f_frsize; /* fundamental file system block size */
fsblkcnt_t f_blocks; /* total # of blocks of f_frsize in fs */
fsblkcnt_t f_bfree; /* total # of free blocks */
fsblkcnt_t f_bavail; /* # of blocks available to non super user */
fsfilcnt_t f_files; /* total # of file nodes (inode in JFS) */
fsfilcnt_t f_ffree; /* total # of free file nodes */
fsfilcnt_t f_favail; /* # of nodes available to non super user */
#ifdef _ALL_SOURCE
fsid_t f_fsid; /* file system id */
#else
ulong_t f_fsid; /* file system id */
#ifndef __64BIT__
ulong_t f_fstype; /* file system type */
#endif
#endif /* _ALL_SOURCE */
char f_basetype[_FSTYPSIZ]; /* Filesystem type name (eg. jfs) */
ulong_t f_flag; /* bit mask of flags */
ulong_t f_namemax; /* maximum filename length */
char f_fstr[32]; /* filesystem-specific string */
ulong_t f_filler[16];/* reserved for future use */
};
#define ST_NOSUID 0x0040 /* don't maintain SUID capability */
#define ST_RDONLY 0x0001 /* file system mounted read only */
#define ST_NODEV 0x0080 /* don't allow device access across */
/* this mount */
/*
* Prototypes
*/
#ifdef _NO_PROTO
extern int statvfs();
extern int fstatvfs();
#else
extern int statvfs(const char *__restrict__, struct statvfs *__restrict__);
extern int fstatvfs(int, struct statvfs *);
#endif
/*
* statvfs64 system call return structure
*/
#ifdef _ALL_SOURCE
struct statvfs64 {
blksize64_t f_bsize; /* preferred file system block size */
blksize64_t f_frsize; /* fundamental file system block size */
blkcnt64_t f_blocks; /* total # of blocks of f_frsize in fs */
blkcnt64_t f_bfree; /* total # of free blocks */
blkcnt64_t f_bavail; /* # of blocks available to non super user */
blkcnt64_t f_files; /* total # of file nodes (inode in JFS) */
blkcnt64_t f_ffree; /* total # of free file nodes */
blkcnt64_t f_favail; /* # of nodes available to non super user */
fsid64_t f_fsid; /* file system id */
char f_basetype[FSTYPSIZ]; /* Filesystem type name (eg. jfs) */
ulong_t f_flag; /* bit mask of flags */
ulong_t f_namemax; /* maximum filename length */
char f_fstr[32]; /* filesystem-specific string */
ulong_t f_filler[16];/* reserved for future use */
};
/*
* Prototypes
*/
#ifdef _NO_PROTO
extern int statvfs64();
extern int fstatvfs64();
#else
extern int statvfs64(const char *__restrict__, struct statvfs64 *__restrict__);
extern int fstatvfs64(int, struct statvfs64 *);
#endif
#endif /* _ALL_SOURCE */
#endif /* _XOPEN_SOURCE_EXTENDED */
#endif /* _H_STATVFS */
=================================================

Answer 2

I don't have an AIX system, so I can't tell you the flags to set. However, on Solaris you can view sys/statvfs.h and see how this works, e.g search for statvfs64 and look for the #ifdef blocks surrounding it. You'll see the lines
#if defined(_LARGEFILE64_SOURCE)
typedef struct statvfs64 {
.....
} statvfs64_t;
#endif
#if !defined(_LP64) && _FILE_OFFSET_BITS == 64
...
#define statvfs_t statvfs64_t
#define statvfs statvfs64
#define fstatvfs fstatvfs64
#endif
You will be able to do exactly the same thing on AIX. However, AIX may behave differently and not use the pre-processor to switch between the 32 and 64 bit versions.
If it's not obvious to you, then you could post the contents of sys/statvfs.h up here and we can take a look for you.

Answer 3

iirc on AIX you need the _LARGE_FILES token set, which will enable implicit large file support.
-D_LARGE_FILES
If you want to call statvfs64 explicittly, you have to do
-D_LARGE_FILE_API