/***************************************************************
  SYS-CHDIR.C

       This file contains Linux/x86_64/LP64 implementation of
       __cpu_sys_cwd_init() and __cpu_sys_chdir().

       PART OF : CPU - library .

       USAGE   : Internal only .

       Copyright (C) 2026  by Andrew V.Kosteltsev.
       All Rights Reserved.
 ***************************************************************/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <errno.h>
#include <fcntl.h>

#include <libmcpu.h>
#include <cpu-sysdeps.h>


static __mpu_int64_t
__cpu_open_directory( int dirfd, const char *path )
{
  int  fd;

  if( !path ) return( -(__mpu_int64_t)__MCPU_EFAULT );

  fd = openat( dirfd, path, O_PATH | O_DIRECTORY | O_CLOEXEC );
  if( fd < 0 ) return( -(__mpu_int64_t)__cpu_errno_from_host( errno ) );
  return( (__mpu_int64_t)fd );

} /* End of __cpu_open_directory() */


__mpu_int64_t
__cpu_sys_cwd_init( void )
{
  return( __cpu_open_directory( AT_FDCWD, "." ) );

} /* End of __cpu_sys_cwd_init() */


__mpu_int64_t
__cpu_sys_chdir( int dirfd, const char *path )
{
  return( __cpu_open_directory( dirfd, path ) );

} /* End of __cpu_sys_chdir() */