diff options
Diffstat (limited to 'cpukit/libcsupport/src/dup2.c')
-rw-r--r-- | cpukit/libcsupport/src/dup2.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/cpukit/libcsupport/src/dup2.c b/cpukit/libcsupport/src/dup2.c new file mode 100644 index 0000000000..15998f797c --- /dev/null +++ b/cpukit/libcsupport/src/dup2.c @@ -0,0 +1,52 @@ +/* + * dup2() - POSIX 1003.1b 6.2.1 Duplicate an Open File Descriptor + * + * COPYRIGHT (c) 1989-1999. + * 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 <unistd.h> +#include <fcntl.h> + +#include <rtems/libio_.h> + +int dup2( + int fildes, + int fildes2 +) +{ + int status; + struct stat buf; + + /* + * If fildes is not valid, then fildes2 should not be closed. + */ + + status = fstat( fildes, &buf ); + if ( status == -1 ) + return -1; + + /* + * If fildes2 is not valid, then we should not do anything either. + */ + + status = fstat( fildes2, &buf ); + if ( status == -1 ) + return -1; + + /* + * This fcntl handles everything else. + */ + + return fcntl( fildes, F_DUPFD, fildes2 ); +} |