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/* 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 MALLOC_PROVIDED is defined, we don't need this function.  */

#if defined (REENTRANT_SYSCALLS_PROVIDED) || defined (MALLOC_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) */