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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [reent/] [sbrkr.c] - Blame information for rev 262

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Line No. Rev Author Line
1 207 jeremybenn
/* Reentrant version of sbrk 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 these functions.  Those
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   targets should define REENTRANT_SYSCALLS_PROVIDED in TARGET_CFLAGS.  */
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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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/* If MALLOC_PROVIDED is defined, we don't need this function.  */
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#if defined (REENTRANT_SYSCALLS_PROVIDED) || defined (MALLOC_PROVIDED)
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int _dummy_sbrk_syscalls = 1;
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#else
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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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        <<_sbrk_r>>---Reentrant version of sbrk
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INDEX
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        _sbrk_r
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ANSI_SYNOPSIS
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        #include <reent.h>
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        void *_sbrk_r(struct _reent *<[ptr]>, ptrdiff_t <[incr]>);
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TRAD_SYNOPSIS
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        #include <reent.h>
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        void *_sbrk_r(<[ptr]>, <[incr]>)
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        struct _reent *<[ptr]>;
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        ptrdiff_t <[incr]>;
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DESCRIPTION
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        This is a reentrant version of <<sbrk>>.  It
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        takes a pointer to the global data block, which holds
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        <<errno>>.
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*/
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void *
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_DEFUN (_sbrk_r, (ptr, incr),
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     struct _reent *ptr _AND
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     ptrdiff_t incr)
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{
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  char *ret;
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  void *_sbrk(ptrdiff_t);
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  errno = 0;
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  if ((ret = (char *)(_sbrk (incr))) == (void *) -1 && errno != 0)
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    ptr->_errno = errno;
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  return ret;
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}
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#endif /* ! defined (REENTRANT_SYSCALLS_PROVIDED) */

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