diff options
Diffstat (limited to 'cpukit/libcsupport/src/read.c')
-rw-r--r-- | cpukit/libcsupport/src/read.c | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/cpukit/libcsupport/src/read.c b/cpukit/libcsupport/src/read.c new file mode 100644 index 0000000000..f4c3bdc322 --- /dev/null +++ b/cpukit/libcsupport/src/read.c @@ -0,0 +1,67 @@ +/* + * read() - POSIX 1003.1b 6.4.1 - Read From a File + * + * COPYRIGHT (c) 1989-2010. + * On-Line Applications Research Corporation (OAR). + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.rtems.com/license/LICENSE. + * + * $Id$ + */ + +#if HAVE_CONFIG_H +#include "config.h" +#endif + +#include <rtems/libio_.h> +#include <rtems/seterr.h> + +ssize_t read( + int fd, + void *buffer, + size_t count +) +{ + ssize_t rc; + rtems_libio_t *iop; + + rtems_libio_check_fd( fd ); + iop = rtems_libio_iop( fd ); + rtems_libio_check_is_open( iop ); + rtems_libio_check_buffer( buffer ); + rtems_libio_check_count( count ); + rtems_libio_check_permissions( iop, LIBIO_FLAGS_READ ); + + /* + * Now process the read(). + */ + rc = (*iop->pathinfo.handlers->read_h)( iop, buffer, count ); + + if ( rc > 0 ) + iop->offset += rc; + + return rc; +} + +/* + * _read_r + * + * This is the Newlib dependent reentrant version of read(). + */ + +#if defined(RTEMS_NEWLIB) && !defined(HAVE__READ_R) + +#include <reent.h> + +ssize_t _read_r( + struct _reent *ptr __attribute__((unused)), + int fd, + void *buf, + size_t nbytes +) +{ + return read( fd, buf, nbytes ); +} +#endif |