64 lines
1.2 KiB
C
64 lines
1.2 KiB
C
|
/* Reentrant versions of read 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
|
||
|
|
<<_read_r>>---Reentrant version of read
|
||
|
|
|
||
|
|
INDEX
|
||
|
|
_read_r
|
||
|
|
|
||
|
|
ANSI_SYNOPSIS
|
||
|
|
#include <reent.h>
|
||
|
|
long _read_r(struct _reent *<[ptr]>,
|
||
|
|
int <[fd]>, void *<[buf]>, size_t <[cnt]>);
|
||
|
|
|
||
|
|
TRAD_SYNOPSIS
|
||
|
|
#include <reent.h>
|
||
|
|
long _read_r(<[ptr]>, <[fd]>, <[buf]>, <[cnt]>)
|
||
|
|
struct _reent *<[ptr]>;
|
||
|
|
int <[fd]>;
|
||
|
|
char *<[buf]>;
|
||
|
|
size_t <[cnt]>;
|
||
|
|
|
||
|
|
DESCRIPTION
|
||
|
|
This is a reentrant version of <<read>>. It
|
||
|
|
takes a pointer to the global data block, which holds
|
||
|
|
<<errno>>.
|
||
|
|
*/
|
||
|
|
|
||
|
|
long
|
||
|
|
_read_r (ptr, fd, buf, cnt)
|
||
|
|
struct _reent *ptr;
|
||
|
|
int fd;
|
||
|
|
_PTR buf;
|
||
|
|
size_t cnt;
|
||
|
|
{
|
||
|
|
long ret;
|
||
|
|
|
||
|
|
errno = 0;
|
||
|
|
if ((ret = _read (fd, buf, cnt)) == -1 && errno != 0)
|
||
|
|
ptr->_errno = errno;
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* ! defined (REENTRANT_SYSCALLS_PROVIDED) */
|