146069Sbostic /*-
2*61178Sbostic * Copyright (c) 1990, 1993
3*61178Sbostic * The Regents of the University of California. All rights reserved.
446069Sbostic *
546069Sbostic * This code is derived from software contributed to Berkeley by
646069Sbostic * Chris Torek.
746069Sbostic *
846069Sbostic * %sccs.include.redist.c%
921400Sdist */
1021400Sdist
1126642Sdonn #if defined(LIBC_SCCS) && !defined(lint)
12*61178Sbostic static char sccsid[] = "@(#)fdopen.c 8.1 (Berkeley) 06/04/93";
1346069Sbostic #endif /* LIBC_SCCS and not lint */
1421400Sdist
1517952Sserge #include <sys/types.h>
1646611Sbostic #include <fcntl.h>
1746611Sbostic #include <unistd.h>
1817952Sserge #include <stdio.h>
1946209Sbostic #include <errno.h>
2046069Sbostic #include "local.h"
211999Swnj
221999Swnj FILE *
fdopen(fd,mode)231999Swnj fdopen(fd, mode)
2446069Sbostic int fd;
2546270Storek const char *mode;
261999Swnj {
2746209Sbostic register FILE *fp;
2846069Sbostic static int nofile;
2946209Sbostic int flags, oflags, fdflags, tmp;
301999Swnj
3146069Sbostic if (nofile == 0)
3217952Sserge nofile = getdtablesize();
3317952Sserge
3446209Sbostic if ((flags = __sflags(mode, &oflags)) == 0)
3513495Ssam return (NULL);
3617952Sserge
3746069Sbostic /* Make sure the mode the user wants is a subset of the actual mode. */
3846209Sbostic if ((fdflags = fcntl(fd, F_GETFL, 0)) < 0)
3946209Sbostic return (NULL);
4046209Sbostic tmp = fdflags & O_ACCMODE;
4146209Sbostic if (tmp != O_RDWR && (tmp != (oflags & O_ACCMODE))) {
4246069Sbostic errno = EINVAL;
4317952Sserge return (NULL);
4446069Sbostic }
4517952Sserge
4646069Sbostic if ((fp = __sfp()) == NULL)
4746069Sbostic return (NULL);
4846209Sbostic fp->_flags = flags;
4946069Sbostic /*
5046069Sbostic * If opened for appending, but underlying descriptor does not have
5146069Sbostic * O_APPEND bit set, assert __SAPP so that __swrite() will lseek to
5246069Sbostic * end before each write.
5346069Sbostic */
5446069Sbostic if ((oflags & O_APPEND) && !(fdflags & O_APPEND))
5546069Sbostic fp->_flags |= __SAPP;
5646069Sbostic fp->_file = fd;
5746069Sbostic fp->_cookie = fp;
5846069Sbostic fp->_read = __sread;
5946069Sbostic fp->_write = __swrite;
6046069Sbostic fp->_seek = __sseek;
6146069Sbostic fp->_close = __sclose;
6246069Sbostic return (fp);
631999Swnj }
64