bc093719ca
The last half year I've been working on a replacement TTY layer for the FreeBSD kernel. The new TTY layer was designed to improve the following: - Improved driver model: The old TTY layer has a driver model that is not abstract enough to make it friendly to use. A good example is the output path, where the device drivers directly access the output buffers. This means that an in-kernel PPP implementation must always convert network buffers into TTY buffers. If a PPP implementation would be built on top of the new TTY layer (still needs a hooks layer, though), it would allow the PPP implementation to directly hand the data to the TTY driver. - Improved hotplugging: With the old TTY layer, it isn't entirely safe to destroy TTY's from the system. This implementation has a two-step destructing design, where the driver first abandons the TTY. After all threads have left the TTY, the TTY layer calls a routine in the driver, which can be used to free resources (unit numbers, etc). The pts(4) driver also implements this feature, which means posix_openpt() will now return PTY's that are created on the fly. - Improved performance: One of the major improvements is the per-TTY mutex, which is expected to improve scalability when compared to the old Giant locking. Another change is the unbuffered copying to userspace, which is both used on TTY device nodes and PTY masters. Upgrading should be quite straightforward. Unlike previous versions, existing kernel configuration files do not need to be changed, except when they reference device drivers that are listed in UPDATING. Obtained from: //depot/projects/mpsafetty/... Approved by: philip (ex-mentor) Discussed: on the lists, at BSDCan, at the DevSummit Sponsored by: Snow B.V., the Netherlands dcons(4) fixed by: kan
343 lines
7.3 KiB
C
343 lines
7.3 KiB
C
/*-
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* Copyright (c) 2007 Robert N. M. Watson
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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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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/sysctl.h>
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#include <sys/un.h>
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#include <sys/user.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <err.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "procstat.h"
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static const char *
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protocol_to_string(int domain, int type, int protocol)
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{
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switch (domain) {
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case AF_INET:
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case AF_INET6:
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switch (protocol) {
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case IPPROTO_TCP:
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return ("TCP");
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case IPPROTO_UDP:
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return ("UDP");
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case IPPROTO_ICMP:
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return ("ICM");
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case IPPROTO_RAW:
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return ("RAW");
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case IPPROTO_SCTP:
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return ("SCT");
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case IPPROTO_DIVERT:
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return ("IPD");
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default:
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return ("IP?");
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}
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case AF_LOCAL:
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switch (type) {
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case SOCK_STREAM:
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return ("UDS");
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case SOCK_DGRAM:
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return ("UDD");
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default:
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return ("UD?");
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}
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default:
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return ("?");
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}
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}
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static void
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addr_to_string(struct sockaddr_storage *ss, char *buffer, int buflen)
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{
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char buffer2[INET6_ADDRSTRLEN];
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struct sockaddr_in6 *sin6;
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struct sockaddr_in *sin;
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struct sockaddr_un *sun;
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switch (ss->ss_family) {
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case AF_LOCAL:
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sun = (struct sockaddr_un *)ss;
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if (strlen(sun->sun_path) == 0)
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strlcpy(buffer, "-", buflen);
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else
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strlcpy(buffer, sun->sun_path, buflen);
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break;
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case AF_INET:
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sin = (struct sockaddr_in *)ss;
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snprintf(buffer, buflen, "%s:%d", inet_ntoa(sin->sin_addr),
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ntohs(sin->sin_port));
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break;
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case AF_INET6:
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sin6 = (struct sockaddr_in6 *)ss;
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if (inet_ntop(AF_INET6, &sin6->sin6_addr, buffer2,
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sizeof(buffer2)) != NULL)
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snprintf(buffer, buflen, "%s.%d", buffer2,
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ntohs(sin6->sin6_port));
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else
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strlcpy(buffer, "-", sizeof(buffer));
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break;
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default:
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strlcpy(buffer, "", buflen);
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break;
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}
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}
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static void
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print_address(struct sockaddr_storage *ss)
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{
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char addr[PATH_MAX];
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addr_to_string(ss, addr, sizeof(addr));
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printf("%s", addr);
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}
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void
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procstat_files(pid_t pid, struct kinfo_proc *kipp)
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{
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struct kinfo_file *freep, *kif;
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int error, name[4];
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unsigned int i;
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const char *str;
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size_t len;
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if (!hflag)
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printf("%5s %-16s %4s %1s %1s %-8s %3s %7s %-3s %-12s\n",
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"PID", "COMM", "FD", "T", "V", "FLAGS", "REF", "OFFSET",
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"PRO", "NAME");
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name[0] = CTL_KERN;
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name[1] = KERN_PROC;
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name[2] = KERN_PROC_FILEDESC;
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name[3] = pid;
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error = sysctl(name, 4, NULL, &len, NULL, 0);
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if (error < 0 && errno != ESRCH && errno != EPERM) {
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warn("sysctl: kern.proc.filedesc: %d", pid);
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return;
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}
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if (error < 0)
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return;
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freep = kif = malloc(len);
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if (kif == NULL)
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err(-1, "malloc");
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if (sysctl(name, 4, kif, &len, NULL, 0) < 0) {
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warn("sysctl: kern.proc.filedesc %d", pid);
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free(freep);
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return;
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}
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for (i = 0; i < len / sizeof(*kif); i++, kif++) {
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if (kif->kf_structsize != sizeof(*kif))
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errx(-1, "kinfo_file mismatch");
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printf("%5d ", pid);
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printf("%-16s ", kipp->ki_comm);
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switch (kif->kf_fd) {
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case KF_FD_TYPE_CWD:
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printf(" cwd ");
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break;
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case KF_FD_TYPE_ROOT:
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printf("root ");
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break;
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case KF_FD_TYPE_JAIL:
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printf("jail ");
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break;
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default:
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printf("%4d ", kif->kf_fd);
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break;
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}
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switch (kif->kf_type) {
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case KF_TYPE_VNODE:
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str = "v";
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break;
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case KF_TYPE_SOCKET:
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str = "s";
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break;
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case KF_TYPE_PIPE:
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str = "p";
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break;
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case KF_TYPE_FIFO:
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str = "f";
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break;
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case KF_TYPE_KQUEUE:
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str = "k";
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break;
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case KF_TYPE_CRYPTO:
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str = "c";
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break;
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case KF_TYPE_MQUEUE:
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str = "m";
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break;
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case KF_TYPE_SHM:
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str = "h";
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break;
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case KF_TYPE_PTS:
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str = "t";
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break;
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case KF_TYPE_SEM:
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str = "e";
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break;
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case KF_TYPE_NONE:
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case KF_TYPE_UNKNOWN:
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default:
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str = "?";
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break;
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}
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printf("%1s ", str);
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str = "-";
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if (kif->kf_type == KF_TYPE_VNODE) {
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switch (kif->kf_vnode_type) {
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case KF_VTYPE_VREG:
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str = "r";
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break;
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case KF_VTYPE_VDIR:
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str = "d";
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break;
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case KF_VTYPE_VBLK:
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str = "b";
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break;
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case KF_VTYPE_VCHR:
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str = "c";
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break;
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case KF_VTYPE_VLNK:
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str = "l";
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break;
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case KF_VTYPE_VSOCK:
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str = "s";
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break;
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case KF_VTYPE_VFIFO:
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str = "f";
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break;
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case KF_VTYPE_VBAD:
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str = "x";
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break;
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case KF_VTYPE_VNON:
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case KF_VTYPE_UNKNOWN:
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default:
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str = "?";
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break;
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}
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}
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printf("%1s ", str);
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printf("%s", kif->kf_flags & KF_FLAG_READ ? "r" : "-");
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printf("%s", kif->kf_flags & KF_FLAG_WRITE ? "w" : "-");
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printf("%s", kif->kf_flags & KF_FLAG_APPEND ? "a" : "-");
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printf("%s", kif->kf_flags & KF_FLAG_ASYNC ? "s" : "-");
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printf("%s", kif->kf_flags & KF_FLAG_FSYNC ? "f" : "-");
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printf("%s", kif->kf_flags & KF_FLAG_NONBLOCK ? "n" : "-");
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printf("%s", kif->kf_flags & KF_FLAG_DIRECT ? "d" : "-");
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printf("%s ", kif->kf_flags & KF_FLAG_HASLOCK ? "l" : "-");
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if (kif->kf_ref_count > -1)
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printf("%3d ", kif->kf_ref_count);
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else
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printf("%3c ", '-');
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if (kif->kf_offset > -1)
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printf("%7jd ", (intmax_t)kif->kf_offset);
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else
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printf("%7c ", '-');
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switch (kif->kf_type) {
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case KF_TYPE_VNODE:
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case KF_TYPE_FIFO:
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case KF_TYPE_PTS:
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printf("%-3s ", "-");
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printf("%-18s", kif->kf_path);
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break;
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case KF_TYPE_SOCKET:
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printf("%-3s ",
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protocol_to_string(kif->kf_sock_domain,
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kif->kf_sock_type, kif->kf_sock_protocol));
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/*
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* While generally we like to print two addresses,
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* local and peer, for sockets, it turns out to be
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* more useful to print the first non-nul address for
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* local sockets, as typically they aren't bound and
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* connected, and the path strings can get long.
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*/
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if (kif->kf_sock_domain == AF_LOCAL) {
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struct sockaddr_un *sun =
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(struct sockaddr_un *)&kif->kf_sa_local;
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if (sun->sun_path[0] != 0)
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print_address(&kif->kf_sa_local);
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else
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print_address(&kif->kf_sa_peer);
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} else {
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print_address(&kif->kf_sa_local);
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printf(" ");
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print_address(&kif->kf_sa_peer);
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}
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break;
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default:
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printf("%-3s ", "-");
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printf("%-18s", "-");
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}
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printf("\n");
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}
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free(freep);
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}
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