| /* Reentrant versions of lseek system call. */ |
| |
| #include <reent.h> |
| #include <unistd.h> |
| #include <_syslist.h> |
| |
| /* Some targets provides their own versions of this functions. Those |
| targets should define REENTRANT_SYSCALLS_PROVIDED in TARGET_CFLAGS. */ |
| |
| #ifdef _REENT_ONLY |
| #ifndef REENTRANT_SYSCALLS_PROVIDED |
| #define REENTRANT_SYSCALLS_PROVIDED |
| #endif |
| #endif |
| |
| #ifndef REENTRANT_SYSCALLS_PROVIDED |
| |
| /* We use the errno variable used by the system dependent layer. */ |
| #undef errno |
| extern int errno; |
| |
| /* |
| FUNCTION |
| <<_lseek_r>>---Reentrant version of lseek |
| |
| INDEX |
| _lseek_r |
| |
| ANSI_SYNOPSIS |
| #include <reent.h> |
| off_t _lseek_r(struct _reent *<[ptr]>, |
| int <[fd]>, off_t <[pos]>, int <[whence]>); |
| |
| TRAD_SYNOPSIS |
| #include <reent.h> |
| off_t _lseek_r(<[ptr]>, <[fd]>, <[pos]>, <[whence]>) |
| struct _reent *<[ptr]>; |
| int <[fd]>; |
| off_t <[pos]>; |
| int <[whence]>; |
| |
| DESCRIPTION |
| This is a reentrant version of <<lseek>>. It |
| takes a pointer to the global data block, which holds |
| <<errno>>. |
| */ |
| |
| _off_t |
| _DEFUN (_lseek_r, (ptr, fd, pos, whence), |
| struct _reent *ptr _AND |
| int fd _AND |
| _off_t pos _AND |
| int whence) |
| { |
| _off_t ret; |
| |
| errno = 0; |
| if ((ret = _lseek (fd, pos, whence)) == (_off_t) -1 && errno != 0) |
| ptr->_errno = errno; |
| return ret; |
| } |
| |
| #endif /* ! defined (REENTRANT_SYSCALLS_PROVIDED) */ |
