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[/] [openrisc/] [trunk/] [gnu-old/] [newlib-1.17.0/] [newlib/] [libc/] [reent/] [readr.c] - Rev 855
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/* Reentrant versions of read system call. */ #include <reent.h> #include <unistd.h> #include <_syslist.h> /* Some targets provides their own versions of this functions. Those targets should define REENTRANT_SYSCALLS_PROVIDED in TARGET_CFLAGS. */ #ifdef _REENT_ONLY #ifndef REENTRANT_SYSCALLS_PROVIDED #define REENTRANT_SYSCALLS_PROVIDED #endif #endif #ifndef REENTRANT_SYSCALLS_PROVIDED /* We use the errno variable used by the system dependent layer. */ #undef errno extern int errno; /* FUNCTION <<_read_r>>---Reentrant version of read INDEX _read_r ANSI_SYNOPSIS #include <reent.h> _ssize_t _read_r(struct _reent *<[ptr]>, int <[fd]>, void *<[buf]>, size_t <[cnt]>); TRAD_SYNOPSIS #include <reent.h> _ssize_t _read_r(<[ptr]>, <[fd]>, <[buf]>, <[cnt]>) struct _reent *<[ptr]>; int <[fd]>; char *<[buf]>; size_t <[cnt]>; DESCRIPTION This is a reentrant version of <<read>>. It takes a pointer to the global data block, which holds <<errno>>. */ _ssize_t _DEFUN (_read_r, (ptr, fd, buf, cnt), struct _reent *ptr _AND int fd _AND _PTR buf _AND size_t cnt) { _ssize_t ret; errno = 0; if ((ret = (_ssize_t)_read (fd, buf, cnt)) == -1 && errno != 0) ptr->_errno = errno; return ret; } #endif /* ! defined (REENTRANT_SYSCALLS_PROVIDED) */
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