66 lines
1.3 KiB
C
66 lines
1.3 KiB
C
/* 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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