source: rtems/cpukit/libcsupport/src/fcntl.c @ c0a36429

4.104.114.84.95
Last change on this file since c0a36429 was c0a36429, checked in by Joel Sherrill <joel.sherrill@…>, on 03/19/99 at 22:59:20

A cleanup patch on fcntl.c from Eric Norum <eric@…> for
2 lines of code that did not get included when Joel tried to manually
add a rejected patch.
  • Property mode set to 100644
File size: 3.0 KB
Line 
1/*
2 *   fcntl() - POSIX 1003.1b 6.5.2 - File Control
3 *
4 *  COPYRIGHT (c) 1989-1998.
5 *  On-Line Applications Research Corporation (OAR).
6 *  Copyright assigned to U.S. Government, 1994.
7 *
8 *  The license and distribution terms for this file may be
9 *  found in the file LICENSE in this distribution or at
10 *  http://www.OARcorp.com/rtems/license.html.
11 *
12 *  $Id$
13 */
14
15#include <unistd.h>
16#include <fcntl.h>
17#include <errno.h>
18
19#include <rtems.h>
20#include "libio_.h"
21
22int fcntl(
23  int fd,
24  int cmd,
25  ...
26)
27{
28  va_list        ap;
29  rtems_libio_t *iop;
30  rtems_libio_t *diop;
31  int            fd2;
32  int            flags;
33  int            ret = 0;
34 
35  va_start( ap, cmd );
36
37  rtems_libio_check_fd( fd );
38  iop = rtems_libio_iop( fd );
39  rtems_libio_check_is_open(iop);
40
41  /*
42   *  Now process the fcntl().
43   */
44
45  /*
46   *  This switch should contain all the cases from POSIX.
47   */
48
49  switch ( cmd ) {
50    case F_DUPFD:        /* dup */
51      fd2 = va_arg( ap, int );
52      if ( fd2 )
53        diop = rtems_libio_iop( fd2 );
54      else {
55        /* allocate a file control block */
56        diop = rtems_libio_allocate();
57        if ( diop == 0 ) {
58          ret = -1;
59          break;
60        }
61      }
62
63      diop->handlers   = iop->handlers;
64      diop->file_info  = iop->file_info;
65      diop->flags      = iop->flags;
66      diop->pathinfo   = iop->pathinfo;
67     
68      break;
69
70    case F_GETFD:        /* get f_flags */
71      ret = ((iop->flags & LIBIO_FLAGS_CLOSE_ON_EXEC) != 0);
72      break;
73
74    case F_SETFD:        /* set f_flags */
75      /*
76       *  Interpret the third argument as the "close on exec()" flag.
77       *  If this argument is 1, then the file descriptor is to be closed
78       *  if a new process is exec()'ed.  Since RTEMS does not support
79       *  processes, then we can ignore this one except to make
80       *  F_GETFD work.
81       */
82
83      if ( va_arg( ap, int ) )
84        iop->flags |= LIBIO_FLAGS_CLOSE_ON_EXEC;
85      else
86        iop->flags &= ~LIBIO_FLAGS_CLOSE_ON_EXEC;
87      break;
88
89    case F_GETFL:        /* more flags (cloexec) */
90      ret = rtems_libio_to_fcntl_flags( iop->flags );
91
92    case F_SETFL:
93      flags = rtems_libio_fcntl_flags( va_arg( ap, int ) );
94
95      /*
96       *  XXX If we are turning on append, should we seek to the end?
97       */
98
99      iop->flags = (iop->flags & ~(O_APPEND | O_NONBLOCK)) |
100                   (flags & (O_APPEND | O_NONBLOCK));
101      break;
102
103    case F_GETLK:
104      errno = ENOTSUP;
105      ret = -1;
106      break;
107
108    case F_SETLK:
109      errno = ENOTSUP;
110      ret = -1;
111      break;
112
113    case F_SETLKW:
114      errno = ENOTSUP;
115      ret = -1;
116      break;
117
118    case F_SETOWN:       /*  for sockets. */
119      errno = ENOTSUP;
120      ret = -1;
121      break;
122
123    case F_GETOWN:       /*  for sockets. */
124      errno = ENOTSUP;
125      ret = -1;
126      break;
127
128    default:
129      errno = EINVAL;
130      ret = -1;
131      break;
132  }
133  if ((ret >= 0) && iop->handlers->fcntl) {
134    int err = (*iop->handlers->fcntl)( cmd, iop );
135    if (err) {
136      errno = err;
137      ret = -1;
138    }
139  }
140  return ret;
141}
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