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Diffstat (limited to '')
-rw-r--r-- | c/src/lib/libc/fcntl.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/c/src/lib/libc/fcntl.c b/c/src/lib/libc/fcntl.c new file mode 100644 index 0000000000..f6f33534ab --- /dev/null +++ b/c/src/lib/libc/fcntl.c @@ -0,0 +1,111 @@ +/* + * fcntl() - POSIX 1003.1b 6.5.2 - File Control + * + * COPYRIGHT (c) 1989-1998. + * On-Line Applications Research Corporation (OAR). + * Copyright assigned to U.S. Government, 1994. + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.OARcorp.com/rtems/license.html. + * + * $Id$ + */ + +#include <unistd.h> +#include <fcntl.h> +#include <errno.h> + +#include <rtems.h> +#include "libio_.h" + +int fcntl( + int fd, + int cmd, + ... +) +{ + va_list ap; + rtems_libio_t *iop; + + va_start( ap, cmd ); + + /* + * If this is not a file system based entity, it is an error. + */ + + if ( rtems_file_descriptor_type( fd ) ) + set_errno_and_return_minus_one( EBADF ); + + /* + * Now process the fcntl(). + */ + + iop = rtems_libio_iop( fd ); + rtems_libio_check_fd( fd ); + + /* + * This switch should contain all the cases from POSIX. + */ + + switch ( cmd ) { + case F_DUPFD: /* dup */ + /* + * This is how it appears that this case should work: + * + * filedes2 = va_arg( ap, int ) + * if filedes2 is 0 + * duplicate fd into a new descriptor + * else + * duplicate fd into specified descriptor after error checking it + * + * See dup2() in case we can eliminate stuff in there. + */ + return -1; + + case F_GETFD: /* get f_flags */ + if ( iop->flags & LIBIO_FLAGS_CLOSE_ON_EXEC ) + return 1; + return 0; + + case F_SETFD: /* set f_flags */ + /* + * Interpret the third argument as the "close on exec()" flag. + * If this argument is 1, then the file descriptor is to be closed + * if a new process is exec()'ed. Since RTEMS does not support + * processes, then we can ignore this one except to make + * F_GETFD work. + */ + + if ( va_arg( ap, int ) ) + iop->flags |= LIBIO_FLAGS_CLOSE_ON_EXEC; + else + iop->flags &= ~LIBIO_FLAGS_CLOSE_ON_EXEC; + return 0; + + case F_GETFL: /* more flags (cloexec) */ + return -1; + + case F_SETFL: + return -1; + + case F_GETLK: + return -1; + + case F_SETLK: + return -1; + + case F_SETLKW: + return -1; + + case F_SETOWN: /* for sockets. */ + return -1; + + case F_GETOWN: /* for sockets. */ + return -1; + + default: + break; + } + return -1; +} |