diff options
Diffstat (limited to 'lib/libc/stdio/fdopen.c')
| -rw-r--r-- | lib/libc/stdio/fdopen.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/lib/libc/stdio/fdopen.c b/lib/libc/stdio/fdopen.c new file mode 100644 index 000000000000..48ea4018b8bb --- /dev/null +++ b/lib/libc/stdio/fdopen.c @@ -0,0 +1,89 @@ +/*- + * Copyright (c) 1990, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Chris Torek. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "@(#)fdopen.c 8.1 (Berkeley) 6/4/93"; +#endif /* LIBC_SCCS and not lint */ + +#include <sys/types.h> +#include <fcntl.h> +#include <unistd.h> +#include <stdio.h> +#include <errno.h> +#include "local.h" + +FILE * +fdopen(fd, mode) + int fd; + const char *mode; +{ + register FILE *fp; + static int nofile; + int flags, oflags, fdflags, tmp; + + if (nofile == 0) + nofile = getdtablesize(); + + if ((flags = __sflags(mode, &oflags)) == 0) + return (NULL); + + /* Make sure the mode the user wants is a subset of the actual mode. */ + if ((fdflags = fcntl(fd, F_GETFL, 0)) < 0) + return (NULL); + tmp = fdflags & O_ACCMODE; + if (tmp != O_RDWR && (tmp != (oflags & O_ACCMODE))) { + errno = EINVAL; + return (NULL); + } + + if ((fp = __sfp()) == NULL) + return (NULL); + fp->_flags = flags; + /* + * If opened for appending, but underlying descriptor does not have + * O_APPEND bit set, assert __SAPP so that __swrite() will lseek to + * end before each write. + */ + if ((oflags & O_APPEND) && !(fdflags & O_APPEND)) + fp->_flags |= __SAPP; + fp->_file = fd; + fp->_cookie = fp; + fp->_read = __sread; + fp->_write = __swrite; + fp->_seek = __sseek; + fp->_close = __sclose; + return (fp); +} |