summaryrefslogtreecommitdiff
path: root/sysdeps/mach/hurd/fcntl.c
diff options
context:
space:
mode:
authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /sysdeps/mach/hurd/fcntl.c
downloadglibc-28f540f45bbacd939bfd07f213bcad2bf730b1bf.tar.gz
initial import
Diffstat (limited to 'sysdeps/mach/hurd/fcntl.c')
-rw-r--r--sysdeps/mach/hurd/fcntl.c159
1 files changed, 159 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/fcntl.c b/sysdeps/mach/hurd/fcntl.c
new file mode 100644
index 0000000000..4b7207f7ee
--- /dev/null
+++ b/sysdeps/mach/hurd/fcntl.c
@@ -0,0 +1,159 @@
+/* Copyright (C) 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#include <ansidecl.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <hurd.h>
+#include <hurd/fd.h>
+#include <stdarg.h>
+
+
+/* Perform file control operations on FD. */
+int
+DEFUN(__fcntl, (fd, cmd), int fd AND int cmd DOTS)
+{
+ va_list ap;
+ struct hurd_fd *d;
+ int result;
+
+ d = _hurd_fd_get (fd);
+
+ if (d == NULL)
+ return __hurd_fail (EBADF);
+
+ va_start (ap, cmd);
+
+ switch (cmd)
+ {
+ error_t err;
+
+ default: /* Bad command. */
+ errno = EINVAL;
+ result = -1;
+ break;
+
+ /* First the descriptor-based commands, which do no RPCs. */
+
+ case F_DUPFD: /* Duplicate the file descriptor. */
+ {
+ struct hurd_fd *new;
+ io_t port, ctty;
+ struct hurd_userlink ulink, ctty_ulink;
+ int flags;
+
+ HURD_CRITICAL_BEGIN;
+
+ /* Extract the ports and flags from the file descriptor. */
+ __spin_lock (&d->port.lock);
+ flags = d->flags;
+ ctty = _hurd_port_get (&d->ctty, &ctty_ulink);
+ port = _hurd_port_locked_get (&d->port, &ulink); /* Unlocks D. */
+
+ /* Get a new file descriptor. The third argument to __fcntl is the
+ minimum file descriptor number for it. */
+ new = _hurd_alloc_fd (&result, va_arg (ap, int));
+ if (new == NULL)
+ /* _hurd_alloc_fd has set errno. */
+ result = -1;
+ else
+ {
+ /* Give the ports each a user ref for the new descriptor. */
+ __mach_port_mod_refs (__mach_task_self (), port,
+ MACH_PORT_RIGHT_SEND, 1);
+ if (ctty != MACH_PORT_NULL)
+ __mach_port_mod_refs (__mach_task_self (), ctty,
+ MACH_PORT_RIGHT_SEND, 1);
+
+ /* Install the ports and flags in the new descriptor. */
+ if (ctty != MACH_PORT_NULL)
+ _hurd_port_set (&new->ctty, ctty);
+ /* Duplication clears the FD_CLOEXEC flag. */
+ new->flags = flags & ~FD_CLOEXEC;
+ _hurd_port_locked_set (&new->port, port); /* Unlocks NEW. */
+ }
+
+ HURD_CRITICAL_END;
+
+ _hurd_port_free (&d->port, &ulink, port);
+ if (ctty != MACH_PORT_NULL)
+ _hurd_port_free (&d->ctty, &ctty_ulink, port);
+
+ break;
+ }
+
+ /* Set RESULT by evaluating EXPR with the descriptor locked.
+ Check for an empty descriptor and return EBADF. */
+#define LOCKED(expr) \
+ HURD_CRITICAL_BEGIN; \
+ __spin_lock (&d->port.lock); \
+ if (d->port.port == MACH_PORT_NULL) \
+ result = __hurd_fail (EBADF); \
+ else \
+ result = (expr); \
+ __spin_unlock (&d->port.lock); \
+ HURD_CRITICAL_END;
+
+ case F_GETFD: /* Get descriptor flags. */
+ LOCKED (d->flags);
+ break;
+
+ case F_SETFD: /* Set descriptor flags. */
+ LOCKED ((d->flags = va_arg (ap, int), 0));
+ break;
+
+
+ /* Now the real io operations, done by RPCs to io servers. */
+
+ case F_GETLK:
+ case F_SETLK:
+ case F_SETLKW:
+ {
+ struct flock *fl = va_arg (ap, struct flock *);
+ errno = fl?ENOSYS:EINVAL; /* XXX mib needs to implement io rpcs. */
+ result = -1;
+ break;
+ }
+
+ case F_GETFL: /* Get per-open flags. */
+ if (err = HURD_FD_PORT_USE (d, __io_get_openmodes (port, &result)))
+ result = __hurd_dfail (fd, err);
+ break;
+
+ case F_SETFL: /* Set per-open flags. */
+ err = HURD_FD_PORT_USE (d, __io_set_all_openmodes (port,
+ va_arg (ap, int)));
+ result = err ? __hurd_dfail (fd, err) : 0;
+
+ case F_GETOWN: /* Get owner. */
+ if (err = HURD_FD_PORT_USE (d, __io_get_owner (port, &result)))
+ result = __hurd_dfail (fd, err);
+ break;
+
+ case F_SETOWN: /* Set owner. */
+ err = HURD_FD_PORT_USE (d, __io_mod_owner (port, va_arg (ap, pid_t)));
+ result = err ? __hurd_dfail (fd, err) : 0;
+ break;
+ }
+
+ va_end (ap);
+
+ return result;
+}
+
+weak_alias (__fcntl, fcntl)