2 Copyright (C) 1993,94,95,96,97,98, 99 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
25 #include <hurd/hurd_types.h>
26 #include <hurd/port.h>
29 /* Structure representing a file descriptor. */
33 struct hurd_port port; /* io server port. */
34 int flags; /* fcntl flags; locked by port.lock. */
36 /* Normal port to the ctty. When `port' is our ctty, this is a port to
37 the same io object but which never returns EBACKGROUND; when not,
39 struct hurd_port ctty;
43 /* Current file descriptor table. */
45 extern int _hurd_dtablesize;
46 extern struct hurd_fd **_hurd_dtable;
47 extern struct mutex _hurd_dtable_lock; /* Locks those two variables. */
49 #include <hurd/signal.h>
50 #include <lock-intern.h>
52 #ifndef _EXTERN_INLINE
53 #define _EXTERN_INLINE extern __inline
56 /* Returns the descriptor cell for FD. If FD is invalid or unused, return
57 NULL. The cell is unlocked; when ready to use it, lock it and check for
60 _EXTERN_INLINE struct hurd_fd *
63 struct hurd_fd *descriptor;
65 __mutex_lock (&_hurd_dtable_lock);
66 if (fd < 0 || fd >= _hurd_dtablesize)
70 struct hurd_fd *cell = _hurd_dtable[fd];
72 /* No descriptor allocated at this index. */
76 __spin_lock (&cell->port.lock);
77 if (cell->port.port == MACH_PORT_NULL)
78 /* The descriptor at this index has no port in it.
79 This happens if it existed before but was closed. */
83 __spin_unlock (&cell->port.lock);
86 __mutex_unlock (&_hurd_dtable_lock);
92 /* Evaluate EXPR with the variable `descriptor' bound to a pointer to the
93 file descriptor structure for FD. */
95 #define HURD_FD_USE(fd, expr) \
96 ({ struct hurd_fd *descriptor = _hurd_fd_get (fd); \
97 descriptor == NULL ? EBADF : (expr); })
99 /* Evaluate EXPR with the variable `port' bound to the port to FD, and
100 `ctty' bound to the ctty port. */
102 #define HURD_DPORT_USE(fd, expr) \
103 HURD_FD_USE ((fd), HURD_FD_PORT_USE (descriptor, (expr)))
105 /* Likewise, but FD is a pointer to the file descriptor structure. */
107 #define HURD_FD_PORT_USE(fd, expr) \
108 ({ error_t __result; \
109 struct hurd_fd *const __d = (fd); \
110 struct hurd_userlink __ulink, __ctty_ulink; \
112 void *crit = _hurd_critical_section_lock (); \
113 __spin_lock (&__d->port.lock); \
114 if (__d->port.port == MACH_PORT_NULL) \
116 __spin_unlock (&__d->port.lock); \
117 _hurd_critical_section_unlock (crit); \
122 ctty = _hurd_port_get (&__d->ctty, &__ctty_ulink); \
123 port = _hurd_port_locked_get (&__d->port, &__ulink); \
124 _hurd_critical_section_unlock (crit); \
126 _hurd_port_free (&__d->port, &__ulink, port); \
127 if (ctty != MACH_PORT_NULL) \
128 _hurd_port_free (&__d->ctty, &__ctty_ulink, ctty); \
134 /* Check if ERR should generate a signal.
135 Returns the signal to take, or zero if none. */
137 _EXTERN_INLINE error_t
138 _hurd_fd_error_signal (error_t err)
142 case EMACH_SEND_INVALID_DEST:
143 case EMIG_SERVER_DIED:
144 /* The server has disappeared! */
149 /* Having a default case avoids -Wenum-switch warnings. */
154 /* Handle an error from an RPC on a file descriptor's port. You should
155 always use this function to handle errors from RPCs made on file
156 descriptor ports. Some errors are translated into signals. */
158 _EXTERN_INLINE error_t
159 _hurd_fd_error (int fd, error_t err)
161 int signo = _hurd_fd_error_signal (err);
164 const struct hurd_signal_detail detail
165 = { code: fd, error: err, exc: 0 };
166 _hurd_raise_signal (NULL, signo, &detail);
171 /* Handle error code ERR from an RPC on file descriptor FD's port.
172 Set `errno' to the appropriate error code, and always return -1. */
175 __hurd_dfail (int fd, error_t err)
177 errno = _hurd_fd_error (fd, err);
181 /* Set up *FD to have PORT its server port, doing appropriate ctty magic.
182 Does no locking or unlocking. */
184 extern void _hurd_port2fd (struct hurd_fd *fd, io_t port, int flags);
186 /* Allocate a new file descriptor and install PORT in it (doing any
187 appropriate ctty magic); consumes a user reference on PORT. FLAGS are
188 as for `open'; only O_IGNORE_CTTY is meaningful, but all are saved.
190 If the descriptor table is full, set errno, and return -1.
191 If DEALLOC is nonzero, deallocate PORT first. */
193 extern int _hurd_intern_fd (io_t port, int flags, int dealloc);
195 /* Allocate a new file descriptor in the table and return it, locked. The
196 new descriptor number will be no less than FIRST_FD. If the table is
197 full, set errno to EMFILE and return NULL. If FIRST_FD is negative or
198 bigger than the size of the table, set errno to EINVAL and return NULL. */
200 extern struct hurd_fd *_hurd_alloc_fd (int *fd_ptr, int first_fd);
202 /* Allocate a new file descriptor structure and initialize its port cells
203 with PORT and CTTY. (This does not affect the descriptor table.) */
205 extern struct hurd_fd *_hurd_new_fd (io_t port, io_t ctty);
207 /* Close a file descriptor, making it available for future reallocation. */
209 extern error_t _hurd_fd_close (struct hurd_fd *fd);
211 /* Read and write data from a file descriptor; just like `read' and `write'
212 if OFFSET is -1, or like `pread' and `pwrite' if OFFSET is not -1.
213 If successful, stores the amount actually read or written in *NBYTES. */
215 extern error_t _hurd_fd_read (struct hurd_fd *fd,
216 void *buf, size_t *nbytes, off_t offset);
217 extern error_t _hurd_fd_write (struct hurd_fd *fd,
218 const void *buf, size_t *nbytes, off_t offset);
221 /* Call *RPC on PORT and/or CTTY; if a call on CTTY returns EBACKGROUND,
222 generate SIGTTIN/SIGTTOU or EIO as appropriate. */
224 extern error_t _hurd_ctty_input (io_t port, io_t ctty, error_t (*rpc) (io_t));
225 extern error_t _hurd_ctty_output (io_t port, io_t ctty, error_t (*rpc) (io_t));
228 /* The guts of `select' and `poll'. Check the first NFDS descriptors
229 either in POLLFDS (if nonnull) or in each of READFDS, WRITEFDS,
230 EXCEPTFDS that is nonnull. If TIMEOUT is not NULL, time out after
231 waiting the interval specified therein. If SIGMASK is nonnull,
232 the set of blocked signals is temporarily set to that during this call.
233 Returns the number of ready descriptors, or -1 for errors. */
236 extern int _hurd_select (int nfds, struct pollfd *pollfds,
237 fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
238 const struct timespec *timeout,
239 const sigset_t *sigmask);
242 #endif /* hurd/fd.h */