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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libc/] [fcntl.c] - Rev 476
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/* * fcntl() - POSIX 1003.1b 6.5.2 - File Control * * 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.OARcorp.com/rtems/license.html. * * $Id: fcntl.c,v 1.2 2001-09-27 12:01:15 chris Exp $ */ #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; rtems_libio_t *diop; int fd2; int flags; int mask; int ret = 0; va_start( ap, cmd ); rtems_libio_check_fd( fd ); iop = rtems_libio_iop( fd ); rtems_libio_check_is_open(iop); /* * Now process the fcntl(). */ /* * This switch should contain all the cases from POSIX. */ switch ( cmd ) { case F_DUPFD: /* dup */ fd2 = va_arg( ap, int ); if ( fd2 ) diop = rtems_libio_iop( fd2 ); else { /* allocate a file control block */ diop = rtems_libio_allocate(); if ( diop == 0 ) { ret = -1; break; } } diop->handlers = iop->handlers; diop->file_info = iop->file_info; diop->flags = iop->flags; diop->pathinfo = iop->pathinfo; ret = (int) (diop - rtems_libio_iops); break; case F_GETFD: /* get f_flags */ ret = ((iop->flags & LIBIO_FLAGS_CLOSE_ON_EXEC) != 0); break; 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; break; case F_GETFL: /* more flags (cloexec) */ ret = rtems_libio_to_fcntl_flags( iop->flags ); break; case F_SETFL: flags = rtems_libio_fcntl_flags( va_arg( ap, int ) ); mask = LIBIO_FLAGS_NO_DELAY | LIBIO_FLAGS_APPEND; /* * XXX If we are turning on append, should we seek to the end? */ iop->flags = (iop->flags & ~mask) | (flags & mask); break; case F_GETLK: errno = ENOTSUP; ret = -1; break; case F_SETLK: errno = ENOTSUP; ret = -1; break; case F_SETLKW: errno = ENOTSUP; ret = -1; break; case F_SETOWN: /* for sockets. */ errno = ENOTSUP; ret = -1; break; case F_GETOWN: /* for sockets. */ errno = ENOTSUP; ret = -1; break; default: errno = EINVAL; ret = -1; break; } if ((ret >= 0) && iop->handlers->fcntl) { int err = (*iop->handlers->fcntl)( cmd, iop ); if (err) { errno = err; ret = -1; } } return ret; }
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