123 lines
2.3 KiB
C
123 lines
2.3 KiB
C
/*
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FUNCTION
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<<fdopen>>---turn open file into a stream
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INDEX
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fdopen
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INDEX
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_fdopen_r
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ANSI_SYNOPSIS
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#include <stdio.h>
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FILE *fdopen(int <[fd]>, const char *<[mode]>);
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FILE *_fdopen_r(void *<[reent]>,
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int <[fd]>, const char *<[mode]>);
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TRAD_SYNOPSIS
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#include <stdio.h>
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FILE *fdopen(<[fd]>, <[mode]>)
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int <[fd]>;
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char *<[mode]>;
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FILE *_fdopen_r(<[reent]>, <[fd]>, <[mode]>)
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char *<[reent]>;
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int <[fd]>;
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char *<[mode]>);
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DESCRIPTION
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<<fdopen>> produces a file descriptor of type <<FILE *>>, from a
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descriptor for an already-open file (returned, for example, by the
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system subroutine <<open>> rather than by <<fopen>>).
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The <[mode]> argument has the same meanings as in <<fopen>>.
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RETURNS
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File pointer or <<NULL>>, as for <<fopen>>.
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PORTABILITY
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<<fdopen>> is ANSI.
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*/
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#include <sys/types.h>
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#include <sys/fcntl.h>
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#include <stdio.h>
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#include <errno.h>
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#include "local.h"
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#include <_syslist.h>
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extern int __sflags ();
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FILE *
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_DEFUN (_fdopen_r, (ptr, fd, mode),
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struct _reent *ptr _AND
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int fd _AND
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_CONST char *mode)
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{
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register FILE *fp;
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int flags, oflags;
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#ifdef F_GETFL
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int fdflags, fdmode;
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#endif
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if ((flags = __sflags (ptr, mode, &oflags)) == 0)
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return 0;
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/* make sure the mode the user wants is a subset of the actual mode */
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#ifdef F_GETFL
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if ((fdflags = _fcntl (fd, F_GETFL, 0)) < 0)
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return 0;
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fdmode = fdflags & O_ACCMODE;
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if (fdmode != O_RDWR && (fdmode != (oflags & O_ACCMODE)))
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{
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ptr->_errno = EBADF;
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return 0;
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}
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#endif
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if ((fp = __sfp (ptr)) == 0)
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return 0;
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fp->_flags = flags;
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/*
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* If opened for appending, but underlying descriptor
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* does not have O_APPEND bit set, assert __SAPP so that
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* __swrite() will lseek to end before each write.
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*/
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if ((oflags & O_APPEND)
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#ifdef F_GETFL
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&& !(fdflags & O_APPEND)
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#endif
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)
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fp->_flags |= __SAPP;
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fp->_file = fd;
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fp->_cookie = (_PTR) fp;
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#undef _read
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#undef _write
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#undef _seek
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#undef _close
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fp->_read = __sread;
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fp->_write = __swrite;
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fp->_seek = __sseek;
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fp->_close = __sclose;
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#ifdef __SCLE
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if (setmode(fp->_file, O_BINARY) == O_TEXT)
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fp->_flags |= __SCLE;
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#endif
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return fp;
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}
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#ifndef _REENT_ONLY
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FILE *
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_DEFUN (fdopen, (fd, mode),
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int fd _AND
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_CONST char *mode)
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{
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return _fdopen_r (_REENT, fd, mode);
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}
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#endif
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