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958aa57537
kernel-based POSIX semaphore descriptors to userland via procstat(1) and fstat(1): - Change sem file descriptors to track the pathname they are associated with and add a ksem_info() method to copy the path out to a caller-supplied buffer. - Use the fo_stat() method of shared memory objects and ksem_info() to export the path, mode, and value of a semaphore via struct kinfo_file. - Add a struct semstat to the libprocstat(3) interface along with a procstat_get_sem_info() to export the mode and value of a semaphore. - Teach fstat about semaphores and to display their path, mode, and value. MFC after: 2 weeks
71 lines
2.4 KiB
C
71 lines
2.4 KiB
C
/*-
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* Copyright (c) 2002 Alfred Perlstein <alfred@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _POSIX4_KSEM_H_
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#define _POSIX4_KSEM_H_
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#if !defined(_KERNEL) && !defined(_WANT_FILE)
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#error "no user-servicable parts inside"
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#endif
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#include <sys/condvar.h>
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struct ksem {
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int ks_ref; /* number of references */
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mode_t ks_mode; /* protection bits */
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uid_t ks_uid; /* creator uid */
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gid_t ks_gid; /* creator gid */
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unsigned int ks_value; /* current value */
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struct cv ks_cv; /* waiters sleep here */
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int ks_waiters; /* number of waiters */
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int ks_flags;
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/*
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* Values maintained solely to make this a better-behaved file
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* descriptor for fstat() to run on.
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*
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* XXX: dubious
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*/
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struct timespec ks_atime;
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struct timespec ks_mtime;
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struct timespec ks_ctime;
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struct timespec ks_birthtime;
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struct label *ks_label; /* MAC label */
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const char *ks_path;
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};
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#define KS_ANONYMOUS 0x0001 /* Anonymous (unnamed) semaphore. */
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#define KS_DEAD 0x0002 /* No new waiters allowed. */
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#ifdef _KERNEL
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extern void (*ksem_info)(struct ksem *ks, char *path, size_t size,
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uint32_t *value);
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#endif
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#endif /* !_POSIX4_KSEM_H_ */
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