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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [newlib/] [libc/] [reent/] [sbrkr.c] - Rev 816
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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) */
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