mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-09 00:05:22 +00:00
64 lines
1.2 KiB
C
64 lines
1.2 KiB
C
|
/* Reentrant version of sbrk system call. */
|
||
|
|
|
||
|
|
#include <reent.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <_syslist.h>
|
||
|
|
|
||
|
|
/* Some targets provides their own versions of these functions. Those
|
||
|
|
targets should define REENTRANT_SYSCALLS_PROVIDED in TARGET_CFLAGS. */
|
||
|
|
|
||
|
|
#ifdef _REENT_ONLY
|
||
|
|
#ifndef REENTRANT_SYSCALLS_PROVIDED
|
||
|
|
#define REENTRANT_SYSCALLS_PROVIDED
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if defined (REENTRANT_SYSCALLS_PROVIDED)
|
||
|
|
|
||
|
|
int _dummy_sbrk_syscalls = 1;
|
||
|
|
|
||
|
|
#else
|
||
|
|
|
||
|
|
/* We use the errno variable used by the system dependent layer. */
|
||
|
|
#undef errno
|
||
|
|
extern int errno;
|
||
|
|
|
||
|
|
/*
|
||
|
|
FUNCTION
|
||
|
|
<<_sbrk_r>>---Reentrant version of sbrk
|
||
|
|
|
||
|
|
INDEX
|
||
|
|
_sbrk_r
|
||
|
|
|
||
|
|
ANSI_SYNOPSIS
|
||
|
|
#include <reent.h>
|
||
|
|
void *_sbrk_r(struct _reent *<[ptr]>, ptrdiff_t <[incr]>);
|
||
|
|
|
||
|
|
TRAD_SYNOPSIS
|
||
|
|
#include <reent.h>
|
||
|
|
void *_sbrk_r(<[ptr]>, <[incr]>)
|
||
|
|
struct _reent *<[ptr]>;
|
||
|
|
ptrdiff_t <[incr]>;
|
||
|
|
|
||
|
|
DESCRIPTION
|
||
|
|
This is a reentrant version of <<sbrk>>. It
|
||
|
|
takes a pointer to the global data block, which holds
|
||
|
|
<<errno>>.
|
||
|
|
*/
|
||
|
|
|
||
|
|
void *
|
||
|
|
_DEFUN (_sbrk_r, (ptr, incr),
|
||
|
|
struct _reent *ptr _AND
|
||
|
|
ptrdiff_t incr)
|
||
|
|
{
|
||
|
|
char *ret;
|
||
|
|
void *_sbrk(ptrdiff_t);
|
||
|
|
|
||
|
|
errno = 0;
|
||
|
|
if ((ret = (char *)(_sbrk (incr))) == (void *) -1 && errno != 0)
|
||
|
|
ptr->_errno = errno;
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* ! defined (REENTRANT_SYSCALLS_PROVIDED) */
|