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  1. /* Reentrant versions of lseek system call. */
  2.  
  3. #include <reent.h>
  4. #include <unistd.h>
  5. #include <_syslist.h>
  6.  
  7. /* Some targets provides their own versions of this functions.  Those
  8.    targets should define REENTRANT_SYSCALLS_PROVIDED in TARGET_CFLAGS.  */
  9.  
  10. #ifdef _REENT_ONLY
  11. #ifndef REENTRANT_SYSCALLS_PROVIDED
  12. #define REENTRANT_SYSCALLS_PROVIDED
  13. #endif
  14. #endif
  15.  
  16. #ifndef REENTRANT_SYSCALLS_PROVIDED
  17.  
  18. /* We use the errno variable used by the system dependent layer.  */
  19. #undef errno
  20. extern int errno;
  21.  
  22. /*
  23. FUNCTION
  24.         <<_lseek_r>>---Reentrant version of lseek
  25.        
  26. INDEX
  27.         _lseek_r
  28.  
  29. ANSI_SYNOPSIS
  30.         #include <reent.h>
  31.         off_t _lseek_r(struct _reent *<[ptr]>,
  32.                        int <[fd]>, off_t <[pos]>, int <[whence]>);
  33.  
  34. TRAD_SYNOPSIS
  35.         #include <reent.h>
  36.         off_t _lseek_r(<[ptr]>, <[fd]>, <[pos]>, <[whence]>)
  37.         struct _reent *<[ptr]>;
  38.         int <[fd]>;
  39.         off_t <[pos]>;
  40.         int <[whence]>;
  41.  
  42. DESCRIPTION
  43.         This is a reentrant version of <<lseek>>.  It
  44.         takes a pointer to the global data block, which holds
  45.         <<errno>>.
  46. */
  47.  
  48. _off_t
  49. _DEFUN (_lseek_r, (ptr, fd, pos, whence),
  50.      struct _reent *ptr _AND
  51.      int fd _AND
  52.      _off_t pos _AND
  53.      int whence)
  54. {
  55.   _off_t ret;
  56.  
  57.   errno = 0;
  58.   if ((ret = _lseek (fd, pos, whence)) == (_off_t) -1 && errno != 0)
  59.     ptr->_errno = errno;
  60.   return ret;
  61. }
  62.  
  63. #endif /* ! defined (REENTRANT_SYSCALLS_PROVIDED) */
  64.