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git://sourceware.org/git/newlib-cygwin.git
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f3b8138239
Add a _REENT_ERRNO() macro to encapsulate the access to the _errno member of struct reent. This will help to replace the structure member with a thread-local storage object in a follow up patch. Replace uses of __errno_r() with _REENT_ERRNO(). Keep __errno_r() macro for potential users outside of Newlib.
60 lines
1.2 KiB
C
60 lines
1.2 KiB
C
/* Reentrant versions of lseek system call. */
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#include <reent.h>
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#include <unistd.h>
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#include <_syslist.h>
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/* Some targets provides their own versions of this functions. Those
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targets should define REENTRANT_SYSCALLS_PROVIDED in TARGET_CFLAGS. */
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#ifdef __LARGE64_FILES
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#ifdef _REENT_ONLY
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#ifndef REENTRANT_SYSCALLS_PROVIDED
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#define REENTRANT_SYSCALLS_PROVIDED
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#endif
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#endif
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#ifndef REENTRANT_SYSCALLS_PROVIDED
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/* We use the errno variable used by the system dependent layer. */
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#undef errno
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extern int errno;
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/*
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FUNCTION
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<<_lseek64_r>>---Reentrant version of lseek
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INDEX
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_lseek64_r
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SYNOPSIS
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#include <reent.h>
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off64_t _lseek64_r(struct _reent *<[ptr]>,
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int <[fd]>, off64_t <[pos]>, int <[whence]>);
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DESCRIPTION
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This is a reentrant version of <<lseek64>>. It
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takes a pointer to the global data block, which holds
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<<errno>>. This function only exists on a system
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with large file support.
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*/
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_off64_t
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_lseek64_r (struct _reent *ptr,
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int fd,
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_off64_t pos,
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int whence)
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{
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_off64_t ret;
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errno = 0;
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if ((ret = _lseek64 (fd, pos, whence)) == (_off64_t) -1 && errno != 0)
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_REENT_ERRNO(ptr) = errno;
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return ret;
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}
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#endif /* ! defined (REENTRANT_SYSCALLS_PROVIDED) */
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#endif /* __LARGE64_FILES */
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