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/**************************************************************/
/* tpax: a topological pax implementation */
/* Copyright (C) 2020--2021 SysDeer Technologies, LLC */
/* Released under GPLv2 and GPLv3; see COPYING.TPAX. */
/**************************************************************/
#ifndef TPAX_GETDENTS_IMPL_H
#define TPAX_GETDENTS_IMPL_H
#include <sys/types.h>
#include <dirent.h>
/**************************************************************************/
/* */
/* provide a (static inlined) wrapper around a modern getdents interface. */
/* */
/* see also the PORTING document in the top-level source directory. */
/* */
/**************************************************************************/
/* first priority given to a user-provided emulation */
#if defined (TPAX_GETDENTS_PORTED)
extern long tpax_getdents(int, struct dirent *, size_t);
/* linux & midipix fallback: use the getdents64() system call. */
#elif defined (__linux__) || defined (__midipix__)
#include <sys/syscall.h>
extern long syscall(long, ...);
static long tpax_getdents(int fd, struct dirent * dirents, size_t count)
{
return syscall(SYS_getdents64,fd,dirents,count);
}
/* freebsd fallback: use the __sys_getdirentries() system call. */
#elif defined (__FreeBSD__)
extern ssize_t __sys_getdirentries(int, struct dirent *, size_t, off_t *);
static long tpax_getdents(int fd, struct dirent * dirents, size_t count)
{
return __sys_getdirentries(fd,dirents,count,0);
}
/* not covered and no user-provided emulation */
#else
#error tpax: your target requires the emulation of a modern getdents interface.
#error tpax: see the top-level PORTING document for additional information.
#endif
#endif
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