diff options
Diffstat (limited to 'REORG.TODO/sysdeps/mach/hurd/fcntl.c')
| -rw-r--r-- | REORG.TODO/sysdeps/mach/hurd/fcntl.c | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/mach/hurd/fcntl.c b/REORG.TODO/sysdeps/mach/hurd/fcntl.c new file mode 100644 index 0000000000..174e408edc --- /dev/null +++ b/REORG.TODO/sysdeps/mach/hurd/fcntl.c @@ -0,0 +1,212 @@ +/* Copyright (C) 1992-2017 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 Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <errno.h> +#include <fcntl.h> +#include <hurd.h> +#include <hurd/fd.h> +#include <stdarg.h> +#include <sys/file.h> /* XXX for LOCK_* */ + +/* Perform file control operations on FD. */ +int +__libc_fcntl (int fd, int cmd, ...) +{ + 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. */ + case F_DUPFD_CLOEXEC: + { + 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. */ + + if (cmd == F_DUPFD_CLOEXEC) + flags |= FD_CLOEXEC; + else + /* Duplication clears the FD_CLOEXEC flag. */ + flags &= ~FD_CLOEXEC; + + /* 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); + new->flags = flags; + _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: + { + /* XXX + We need new RPCs to support POSIX.1 fcntl file locking!! + For the time being we support the whole-file case only, + with all kinds of WRONG WRONG WRONG semantics, + by using flock. This is definitely the Wrong Thing, + but it might be better than nothing (?). */ + struct flock *fl = va_arg (ap, struct flock *); + va_end (ap); + switch (cmd) + { + case F_GETLK: + errno = ENOSYS; + return -1; + case F_SETLK: + cmd = LOCK_NB; + break; + default: + cmd = 0; + break; + } + switch (fl->l_type) + { + case F_RDLCK: cmd |= LOCK_SH; break; + case F_WRLCK: cmd |= LOCK_EX; break; + case F_UNLCK: cmd |= LOCK_UN; break; + default: + errno = EINVAL; + return -1; + } + switch (fl->l_whence) + { + case SEEK_SET: + if (fl->l_start == 0 && fl->l_len == 0) /* Whole file request. */ + break; + /* It seems to be common for applications to lock the first + byte of the file when they are really doing whole-file locking. + So, since it's so wrong already, might as well do that too. */ + if (fl->l_start == 0 && fl->l_len == 1) + break; + /* FALLTHROUGH */ + case SEEK_CUR: + case SEEK_END: + errno = ENOTSUP; + return -1; + default: + errno = EINVAL; + return -1; + } + + return __flock (fd, cmd); + } + + 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; + break; + + 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; +} +libc_hidden_def (__libc_fcntl) +weak_alias (__libc_fcntl, __fcntl) +libc_hidden_weak (__fcntl) +weak_alias (__libc_fcntl, fcntl) |