Add posixshmcontrol(1), an utility to manipulate posix shared memory segments.
See usage for the command line structure. Man page will come shortly. Reviewed by: jilles, tmunro Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D20258
This commit is contained in:
kib
parent
ab20dfbb82
commit
424c561806
@ -114,6 +114,7 @@ SUBDIR= alias \
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patch \
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pathchk \
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perror \
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posixshmcontrol \
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pr \
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printenv \
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printf \
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8
usr.bin/posixshmcontrol/Makefile
Normal file
8
usr.bin/posixshmcontrol/Makefile
Normal file
@ -0,0 +1,8 @@
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# $FreeBSD$
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PROG= posixshmcontrol
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LIBADD= util
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WARNS?= 6
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MAN=
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.include <bsd.prog.mk>
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480
usr.bin/posixshmcontrol/posixshmcontrol.c
Normal file
480
usr.bin/posixshmcontrol/posixshmcontrol.c
Normal file
@ -0,0 +1,480 @@
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/*-
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* Copyright (c) 2019 The FreeBSD Foundation
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*
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* This software was developed by Konstantin Belousov <kib@FreeBSD.org>
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* under sponsorship from the FreeBSD Foundation.
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/sysctl.h>
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#include <sys/user.h>
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#include <err.h>
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#include <fcntl.h>
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#include <grp.h>
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#include <libutil.h>
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#include <pwd.h>
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#include <stdbool.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 <unistd.h>
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static void
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usage(void)
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{
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fprintf(stderr, "Usage:\n"
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"posixshmcontrol create [-m <mode>] <path> ...\n"
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"posixshmcontrol rm <path> ...\n"
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"posixshmcontrol ls [-h] [-n]\n"
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"posixshmcontrol dump <path> ...\n"
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"posixshmcontrol stat [-h] [-n] <path> ...\n"
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"posixshmcontrol truncate [-s <newlen>] <path> ...\n");
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}
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static int
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create_one_shm(const char *path, long mode)
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{
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int fd;
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fd = shm_open(path, O_RDWR | O_CREAT, mode);
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if (fd == -1) {
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warn("create %s", path);
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return (1);
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}
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close(fd);
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return (0);
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}
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static int
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create_shm(int argc, char **argv)
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{
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char *end;
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long mode;
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int c, i, ret, ret1;
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mode = 0600;
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while ((c = getopt(argc, argv, "m:")) != -1) {
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switch (c) {
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case 'm':
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errno = 0;
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mode = strtol(optarg, &end, 0);
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if (mode == 0 && errno != 0)
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err(1, "mode:");
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if (*end != '\0')
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errx(1, "non-integer mode");
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break;
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case '?':
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default:
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usage();
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return (2);
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}
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}
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argc -= optind;
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argv += optind;
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ret = 0;
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for (i = 0; i < argc; i++) {
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ret1 = create_one_shm(argv[i], mode);
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if (ret1 != 0 && ret == 0)
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ret = ret1;
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}
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return (ret);
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}
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static int
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delete_one_shm(const char *path)
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{
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int error, ret;
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error = shm_unlink(path);
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if (error != 0) {
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warn("unlink of %s failed", path);
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ret = 1;
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} else {
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ret = 0;
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}
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return (ret);
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}
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static int
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delete_shm(int argc, char **argv)
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{
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int i, ret, ret1;
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ret = 0;
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for (i = 1; i < argc; i++) {
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ret1 = delete_one_shm(argv[i]);
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if (ret1 != 0 && ret == 0)
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ret = ret1;
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}
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return (ret);
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}
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static const char listmib[] = "kern.ipc.posix_shm_list";
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static void
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shm_decode_mode(mode_t m, char *str)
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{
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int i;
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i = 0;
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str[i++] = (m & S_IRUSR) != 0 ? 'r' : '-';
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str[i++] = (m & S_IWUSR) != 0 ? 'w' : '-';
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str[i++] = (m & S_IXUSR) != 0 ? 'x' : '-';
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str[i++] = (m & S_IRGRP) != 0 ? 'r' : '-';
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str[i++] = (m & S_IWGRP) != 0 ? 'w' : '-';
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str[i++] = (m & S_IXGRP) != 0 ? 'x' : '-';
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str[i++] = (m & S_IROTH) != 0 ? 'r' : '-';
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str[i++] = (m & S_IWOTH) != 0 ? 'w' : '-';
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str[i++] = (m & S_IXOTH) != 0 ? 'x' : '-';
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str[i] = '\0';
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}
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static int
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list_shm(int argc, char **argv)
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{
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char *buf, *bp, sizebuf[8], str[10], c;
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const struct kinfo_file *kif;
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struct stat st;
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int error, fd, mib[3], ret;
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size_t len, miblen;
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bool hsize, uname;
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hsize = false;
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uname = true;
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while ((c = getopt(argc, argv, "hn")) != -1) {
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switch (c) {
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case 'h':
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hsize = true;
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break;
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case 'n':
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uname = false;
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break;
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default:
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usage();
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return (2);
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}
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}
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if (argc != optind) {
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usage();
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return (2);
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}
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miblen = nitems(mib);
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error = sysctlnametomib(listmib, mib, &miblen);
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if (error == -1) {
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warn("cannot translate %s", listmib);
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return (1);
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}
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len = 0;
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error = sysctl(mib, miblen, NULL, &len, NULL, 0);
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if (error == -1) {
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warn("cannot get %s length", listmib);
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return (1);
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}
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len = len * 4 / 3;
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buf = malloc(len);
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if (buf == NULL) {
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warn("malloc");
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return (1);
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}
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error = sysctl(mib, miblen, buf, &len, NULL, 0);
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if (error != 0) {
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warn("reading %s", listmib);
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ret = 1;
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goto out;
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}
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ret = 0;
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printf("MODE \tOWNER\tGROUP\tSIZE\tPATH\n");
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for (bp = buf; bp < buf + len; bp += kif->kf_structsize) {
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kif = (const struct kinfo_file *)(void *)bp;
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if (kif->kf_structsize == 0)
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break;
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fd = shm_open(kif->kf_path, O_RDONLY, 0);
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if (fd == -1) {
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warn("open %s", kif->kf_path);
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ret = 1;
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continue;
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}
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error = fstat(fd, &st);
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close(fd);
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if (error != 0) {
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warn("stat %s", kif->kf_path);
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ret = 1;
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continue;
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}
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shm_decode_mode(kif->kf_un.kf_file.kf_file_mode, str);
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printf("%s\t", str);
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if (uname) {
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printf("%s\t%s\t", user_from_uid(st.st_uid, 0),
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group_from_gid(st.st_gid, 0));
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} else {
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printf("%d\t%d\t", st.st_uid, st.st_gid);
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}
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if (hsize) {
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humanize_number(sizebuf, sizeof(sizebuf),
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kif->kf_un.kf_file.kf_file_size, "", HN_AUTOSCALE,
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HN_NOSPACE);
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printf("%s\t", sizebuf);
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} else {
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printf("%jd\t",
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(uintmax_t)kif->kf_un.kf_file.kf_file_size);
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}
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printf("%s\n", kif->kf_path);
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}
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out:
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free(buf);
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return (ret);
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}
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static int
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read_one_shm(const char *path)
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{
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char buf[4096];
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ssize_t size, se;
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int fd, ret;
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ret = 1;
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fd = shm_open(path, O_RDONLY, 0);
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if (fd == -1) {
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warn("open %s", path);
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goto out;
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}
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for (;;) {
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size = read(fd, buf, sizeof(buf));
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if (size > 0) {
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se = fwrite(buf, 1, size, stdout);
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if (se < size) {
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warnx("short write to stdout");
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goto out;
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}
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}
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if (size == (ssize_t)sizeof(buf))
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continue;
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if (size >= 0 && size < (ssize_t)sizeof(buf)) {
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ret = 0;
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goto out;
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}
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warn("read from %s", path);
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goto out;
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}
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out:
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close(fd);
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return (ret);
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}
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static int
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read_shm(int argc, char **argv)
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{
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int i, ret, ret1;
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ret = 0;
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for (i = 1; i < argc; i++) {
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ret1 = read_one_shm(argv[i]);
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if (ret1 != 0 && ret == 0)
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ret = ret1;
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}
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return (ret);
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}
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static int
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stat_one_shm(const char *path, bool hsize, bool uname)
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{
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char sizebuf[8];
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struct stat st;
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int error, fd, ret;
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fd = shm_open(path, O_RDONLY, 0);
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if (fd == -1) {
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warn("open %s", path);
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return (1);
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}
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ret = 0;
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error = fstat(fd, &st);
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if (error == -1) {
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warn("stat %s", path);
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ret = 1;
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} else {
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printf("path\t%s\n", path);
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printf("inode\t%jd\n", (uintmax_t)st.st_ino);
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printf("mode\t%#o\n", st.st_mode);
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printf("nlink\t%jd\n", (uintmax_t)st.st_nlink);
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if (uname) {
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printf("owner\t%s\n", user_from_uid(st.st_uid, 0));
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printf("group\t%s\n", group_from_gid(st.st_gid, 0));
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} else {
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printf("uid\t%d\n", st.st_uid);
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printf("gid\t%d\n", st.st_gid);
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}
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if (hsize) {
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humanize_number(sizebuf, sizeof(sizebuf),
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st.st_size, "", HN_AUTOSCALE, HN_NOSPACE);
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printf("size\t%s\n", sizebuf);
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} else {
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printf("size\t%jd\n", (uintmax_t)st.st_size);
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}
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printf("atime\t%ld.%09ld\n", (long)st.st_atime,
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(long)st.st_atim.tv_nsec);
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printf("mtime\t%ld.%09ld\n", (long)st.st_mtime,
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(long)st.st_mtim.tv_nsec);
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printf("ctime\t%ld.%09ld\n", (long)st.st_ctime,
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(long)st.st_ctim.tv_nsec);
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printf("birth\t%ld.%09ld\n", (long)st.st_birthtim.tv_sec,
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(long)st.st_birthtim.tv_nsec);
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}
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close(fd);
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return (ret);
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}
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static int
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stat_shm(int argc, char **argv)
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{
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int c, i, ret, ret1;
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bool hsize, uname;
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hsize = false;
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uname = true;
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while ((c = getopt(argc, argv, "hn")) != -1) {
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switch (c) {
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case 'h':
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hsize = true;
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break;
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case 'n':
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uname = false;
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break;
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default:
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usage();
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return (2);
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}
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}
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argc -= optind;
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argv += optind;
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ret = 0;
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for (i = 0; i < argc; i++) {
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ret1 = stat_one_shm(argv[i], hsize, uname);
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if (ret1 != 0 && ret == 0)
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ret = ret1;
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}
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return (ret);
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}
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static int
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truncate_one_shm(const char *path, uint64_t newsize)
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{
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int error, fd, ret;
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ret = 0;
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fd = shm_open(path, O_RDWR, 0);
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if (fd == -1) {
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warn("open %s", path);
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return (1);
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}
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error = ftruncate(fd, newsize);
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if (error == -1) {
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warn("truncate %s", path);
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ret = 1;
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}
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close(fd);
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return (ret);
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}
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static int
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truncate_shm(int argc, char **argv)
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{
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uint64_t newsize;
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int c, i, ret, ret1;
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newsize = 0;
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while ((c = getopt(argc, argv, "s:")) != -1) {
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switch (c) {
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case 's':
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if (expand_number(optarg, &newsize) == -1)
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err(1, "size:");
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break;
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case '?':
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default:
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return (2);
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}
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}
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argc -= optind;
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argv += optind;
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ret = 0;
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for (i = 0; i < argc; i++) {
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ret1 = truncate_one_shm(argv[i], newsize);
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if (ret1 != 0 && ret == 0)
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ret = ret1;
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}
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return (ret);
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}
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struct opmode {
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const char *cmd;
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int (*impl)(int argc, char **argv);
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};
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static const struct opmode opmodes[] = {
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{ .cmd = "create", .impl = create_shm},
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{ .cmd = "rm", .impl = delete_shm, },
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{ .cmd = "ls", .impl = list_shm },
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{ .cmd = "dump", .impl = read_shm, },
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{ .cmd = "stat", .impl = stat_shm, },
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{ .cmd = "truncate", .impl = truncate_shm, },
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};
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int
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main(int argc, char *argv[])
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{
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const struct opmode *opmode;
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int i, ret;
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ret = 0;
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opmode = NULL;
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|
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if (argc < 2) {
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usage();
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exit(2);
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}
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for (i = 0; i < (int)nitems(opmodes); i++) {
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if (strcmp(argv[1], opmodes[i].cmd) == 0) {
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opmode = &opmodes[i];
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break;
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}
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}
|
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if (opmode == NULL) {
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usage();
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exit(2);
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}
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ret = opmode->impl(argc - 1, argv + 1);
|
||||
exit(ret);
|
||||
}
|
||||
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Reference in New Issue
Block a user