782 lines
17 KiB
C
782 lines
17 KiB
C
/*
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* lsns(8) - list system namespaces
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*
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* Copyright (C) 2015 Karel Zak <kzak@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <stdio.h>
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#include <string.h>
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#include <getopt.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <dirent.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <wchar.h>
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#include <libsmartcols.h>
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#include "pathnames.h"
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#include "nls.h"
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#include "xalloc.h"
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#include "c.h"
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#include "list.h"
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#include "closestream.h"
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#include "optutils.h"
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#include "procutils.h"
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#include "strutils.h"
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#include "namespace.h"
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#include "path.h"
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#include "idcache.h"
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#include "debug.h"
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UL_DEBUG_DEFINE_MASK(lsns);
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UL_DEBUG_DEFINE_MASKNAMES(lsns) = UL_DEBUG_EMPTY_MASKNAMES;
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#define LSNS_DEBUG_INIT (1 << 1)
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#define LSNS_DEBUG_PROC (1 << 2)
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#define LSNS_DEBUG_NS (1 << 3)
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#define LSNS_DEBUG_ALL 0xFFFF
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#define DBG(m, x) __UL_DBG(lsns, LSNS_DEBUG_, m, x)
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#define ON_DBG(m, x) __UL_DBG_CALL(lsns, LSNS_DEBUG_, m, x)
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struct idcache *uid_cache = NULL;
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/* column IDs */
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enum {
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COL_NS = 0,
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COL_TYPE,
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COL_PATH,
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COL_NPROCS,
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COL_PID,
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COL_PPID,
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COL_COMMAND,
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COL_UID,
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COL_USER
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};
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/* column names */
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struct colinfo {
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const char *name; /* header */
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double whint; /* width hint (N < 1 is in percent of termwidth) */
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int flags; /* SCOLS_FL_* */
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const char *help;
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};
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/* columns descriptions */
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static const struct colinfo infos[] = {
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[COL_NS] = { "NS", 10, SCOLS_FL_RIGHT, N_("namespace identifier (inode number)") },
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[COL_TYPE] = { "TYPE", 5, 0, N_("kind of namespace") },
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[COL_PATH] = { "PATH", 0, 0, N_("path to the namespace")},
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[COL_NPROCS] = { "NPROCS", 5, SCOLS_FL_RIGHT, N_("number of processes in the namespace") },
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[COL_PID] = { "PID", 5, SCOLS_FL_RIGHT, N_("lowest PID in the namespace") },
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[COL_PPID] = { "PPID", 5, SCOLS_FL_RIGHT, N_("PPID of the PID") },
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[COL_COMMAND] = { "COMMAND", 0, SCOLS_FL_TRUNC, N_("command line of the PID")},
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[COL_UID] = { "UID", 0, SCOLS_FL_RIGHT, N_("UID of the PID")},
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[COL_USER] = { "USER", 0, 0, N_("username of the PID")}
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};
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static int columns[ARRAY_SIZE(infos) * 2];
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static size_t ncolumns;
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enum {
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LSNS_ID_MNT = 0,
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LSNS_ID_NET,
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LSNS_ID_PID,
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LSNS_ID_UTS,
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LSNS_ID_IPC,
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LSNS_ID_USER,
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LSNS_ID_CGROUP
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};
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static char *ns_names[] = {
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[LSNS_ID_MNT] = "mnt",
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[LSNS_ID_NET] = "net",
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[LSNS_ID_PID] = "pid",
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[LSNS_ID_UTS] = "uts",
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[LSNS_ID_IPC] = "ipc",
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[LSNS_ID_USER] = "user",
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[LSNS_ID_CGROUP] = "cgroup"
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};
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struct lsns_namespace {
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ino_t id;
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int type; /* LSNS_* */
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int nprocs;
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struct lsns_process *proc;
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struct list_head namespaces; /* lsns->processes member */
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struct list_head processes; /* head of lsns_process *siblings */
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};
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struct lsns_process {
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pid_t pid; /* process PID */
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pid_t ppid; /* parent's PID */
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pid_t tpid; /* thread group */
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char state;
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uid_t uid;
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ino_t ns_ids[ARRAY_SIZE(ns_names)];
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struct list_head ns_siblings[ARRAY_SIZE(ns_names)];
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struct list_head processes; /* list of processes */
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struct libscols_line *outline;
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struct lsns_process *parent;
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};
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struct lsns {
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struct list_head processes;
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struct list_head namespaces;
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pid_t fltr_pid; /* filter out by PID */
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ino_t fltr_ns; /* filter out by namespace */
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int fltr_types[ARRAY_SIZE(ns_names)];
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int fltr_ntypes;
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unsigned int raw : 1,
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json : 1,
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tree : 1,
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list : 1,
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notrunc : 1,
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no_headings: 1;
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};
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static void lsns_init_debug(void)
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{
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__UL_INIT_DEBUG(lsns, LSNS_DEBUG_, 0, LSNS_DEBUG);
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}
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static int ns_name2type(const char *name)
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{
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size_t i;
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for (i = 0; i < ARRAY_SIZE(ns_names); i++) {
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if (strcmp(ns_names[i], name) == 0)
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return i;
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}
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return -1;
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}
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static int column_name_to_id(const char *name, size_t namesz)
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{
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size_t i;
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assert(name);
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for (i = 0; i < ARRAY_SIZE(infos); i++) {
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const char *cn = infos[i].name;
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if (!strncasecmp(name, cn, namesz) && !*(cn + namesz))
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return i;
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}
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warnx(_("unknown column: %s"), name);
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return -1;
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}
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static inline int get_column_id(int num)
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{
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assert(num >= 0);
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assert((size_t) num < ncolumns);
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assert(columns[num] < (int) ARRAY_SIZE(infos));
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return columns[num];
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}
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static inline const struct colinfo *get_column_info(unsigned num)
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{
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return &infos[ get_column_id(num) ];
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}
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static int get_ns_ino(int dir, const char *nsname, ino_t *ino)
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{
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struct stat st;
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char path[16];
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snprintf(path, sizeof(path), "ns/%s", nsname);
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if (fstatat(dir, path, &st, 0) != 0)
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return -errno;
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*ino = st.st_ino;
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return 0;
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}
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static int parse_proc_stat(FILE *fp, pid_t *pid, char *state, pid_t *ppid)
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{
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char *line = NULL, *p;
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size_t len = 0;
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int rc;
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if (getline(&line, &len, fp) < 0) {
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rc = -errno;
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goto error;
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}
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p = strrchr(line, ')');
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if (p == NULL ||
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sscanf(line, "%d (", pid) != 1 ||
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sscanf(p, ") %c %d*[^\n]", state, ppid) != 2) {
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rc = -EINVAL;
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goto error;
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}
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rc = 0;
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error:
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free(line);
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return rc;
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}
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static int read_process(struct lsns *ls, pid_t pid)
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{
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struct lsns_process *p = NULL;
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char buf[BUFSIZ];
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DIR *dir;
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int rc = 0, fd;
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FILE *f = NULL;
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size_t i;
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struct stat st;
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DBG(PROC, ul_debug("reading %d", (int) pid));
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snprintf(buf, sizeof(buf), "/proc/%d", pid);
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dir = opendir(buf);
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if (!dir)
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return -errno;
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p = xcalloc(1, sizeof(*p));
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if (!p) {
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rc = -ENOMEM;
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goto done;
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}
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if (fstat(dirfd(dir), &st) == 0) {
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p->uid = st.st_uid;
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add_uid(uid_cache, st.st_uid);
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}
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fd = openat(dirfd(dir), "stat", O_RDONLY);
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if (fd < 0) {
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rc = -errno;
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goto done;
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}
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if (!(f = fdopen(fd, "r"))) {
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rc = -errno;
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goto done;
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}
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rc = parse_proc_stat(f, &p->pid, &p->state, &p->ppid);
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if (rc < 0)
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goto done;
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rc = 0;
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for (i = 0; i < ARRAY_SIZE(p->ns_ids); i++) {
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INIT_LIST_HEAD(&p->ns_siblings[i]);
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if (!ls->fltr_types[i])
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continue;
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rc = get_ns_ino(dirfd(dir), ns_names[i], &p->ns_ids[i]);
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if (rc && rc != -EACCES && rc != -ENOENT)
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goto done;
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rc = 0;
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}
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INIT_LIST_HEAD(&p->processes);
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DBG(PROC, ul_debugobj(p, "new pid=%d", p->pid));
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list_add_tail(&p->processes, &ls->processes);
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done:
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if (f)
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fclose(f);
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closedir(dir);
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if (rc)
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free(p);
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return rc;
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}
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static int read_processes(struct lsns *ls)
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{
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struct proc_processes *proc = NULL;
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pid_t pid;
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int rc = 0;
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DBG(PROC, ul_debug("opening /proc"));
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if (!(proc = proc_open_processes())) {
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rc = -errno;
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goto done;
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}
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while (proc_next_pid(proc, &pid) == 0) {
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rc = read_process(ls, pid);
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if (rc && rc != -EACCES && rc != -ENOENT)
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break;
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rc = 0;
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}
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done:
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DBG(PROC, ul_debug("closing /proc"));
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proc_close_processes(proc);
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return rc;
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}
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static struct lsns_namespace *get_namespace(struct lsns *ls, ino_t ino)
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{
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struct list_head *p;
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list_for_each(p, &ls->namespaces) {
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struct lsns_namespace *ns = list_entry(p, struct lsns_namespace, namespaces);
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if (ns->id == ino)
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return ns;
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}
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return NULL;
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}
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static int namespace_has_process(struct lsns_namespace *ns, pid_t pid)
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{
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struct list_head *p;
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list_for_each(p, &ns->processes) {
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struct lsns_process *proc = list_entry(p, struct lsns_process, ns_siblings[ns->type]);
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if (proc->pid == pid)
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return 1;
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}
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return 0;
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}
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static struct lsns_namespace *add_namespace(struct lsns *ls, int type, ino_t ino)
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{
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struct lsns_namespace *ns = xcalloc(1, sizeof(*ns));
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if (!ns)
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return NULL;
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DBG(NS, ul_debugobj(ns, "new %s[%ju]", ns_names[type], (uintmax_t)ino));
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INIT_LIST_HEAD(&ns->processes);
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INIT_LIST_HEAD(&ns->namespaces);
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ns->type = type;
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ns->id = ino;
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list_add_tail(&ns->namespaces, &ls->namespaces);
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return ns;
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}
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static int add_process_to_namespace(struct lsns *ls, struct lsns_namespace *ns, struct lsns_process *proc)
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{
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struct list_head *p;
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DBG(NS, ul_debugobj(ns, "add process [%p] pid=%d to %s[%ju]",
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proc, proc->pid, ns_names[ns->type], (uintmax_t)ns->id));
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list_for_each(p, &ls->processes) {
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struct lsns_process *xproc = list_entry(p, struct lsns_process, processes);
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if (xproc->pid == proc->ppid) /* my parent */
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proc->parent = xproc;
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else if (xproc->ppid == proc->pid) /* my child */
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xproc->parent = proc;
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}
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list_add_tail(&proc->ns_siblings[ns->type], &ns->processes);
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ns->nprocs++;
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if (!ns->proc || ns->proc->pid > proc->pid)
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ns->proc = proc;
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return 0;
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}
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static int cmp_namespaces(struct list_head *a, struct list_head *b,
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__attribute__((__unused__)) void *data)
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{
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struct lsns_namespace *xa = list_entry(a, struct lsns_namespace, namespaces),
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*xb = list_entry(b, struct lsns_namespace, namespaces);
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return cmp_numbers(xa->id, xb->id);
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}
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static int read_namespaces(struct lsns *ls)
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{
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struct list_head *p;
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DBG(NS, ul_debug("reading namespace"));
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list_for_each(p, &ls->processes) {
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size_t i;
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struct lsns_namespace *ns;
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struct lsns_process *proc = list_entry(p, struct lsns_process, processes);
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for (i = 0; i < ARRAY_SIZE(proc->ns_ids); i++) {
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if (proc->ns_ids[i] == 0)
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continue;
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if (!(ns = get_namespace(ls, proc->ns_ids[i]))) {
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ns = add_namespace(ls, i, proc->ns_ids[i]);
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if (!ns)
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return -ENOMEM;
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}
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add_process_to_namespace(ls, ns, proc);
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}
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}
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list_sort(&ls->namespaces, cmp_namespaces, NULL);
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return 0;
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}
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static void add_scols_line(struct lsns *ls, struct libscols_table *table,
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struct lsns_namespace *ns, struct lsns_process *proc)
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{
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size_t i;
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struct libscols_line *line;
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assert(ns);
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assert(table);
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line = scols_table_new_line(table,
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ls->tree && proc->parent ? proc->parent->outline : NULL);
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if (!line) {
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warn(_("failed to add line to output"));
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return;
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}
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for (i = 0; i < ncolumns; i++) {
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char *str = NULL;
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switch (get_column_id(i)) {
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case COL_NS:
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xasprintf(&str, "%ju", (uintmax_t)ns->id);
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break;
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case COL_PID:
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xasprintf(&str, "%d", (int) proc->pid);
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break;
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case COL_PPID:
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xasprintf(&str, "%d", (int) proc->ppid);
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break;
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case COL_TYPE:
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xasprintf(&str, "%s", ns_names[ns->type]);
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break;
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case COL_NPROCS:
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xasprintf(&str, "%d", ns->nprocs);
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break;
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case COL_COMMAND:
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str = proc_get_command(proc->pid);
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if (!str)
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str = proc_get_command_name(proc->pid);
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break;
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case COL_PATH:
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xasprintf(&str, "/proc/%d/ns/%s", (int) proc->pid, ns_names[ns->type]);
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break;
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case COL_UID:
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xasprintf(&str, "%d", (int) proc->uid);
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break;
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case COL_USER:
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xasprintf(&str, "%s", get_id(uid_cache, proc->uid)->name);
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break;
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default:
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break;
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}
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if (str && scols_line_refer_data(line, i, str) != 0)
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err_oom();
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}
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proc->outline = line;
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}
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static struct libscols_table *init_scols_table(struct lsns *ls)
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{
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struct libscols_table *tab;
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size_t i;
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tab = scols_new_table();
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if (!tab) {
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warn(_("failed to initialize output table"));
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return NULL;
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}
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scols_table_enable_raw(tab, ls->raw);
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scols_table_enable_json(tab, ls->json);
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scols_table_enable_noheadings(tab, ls->no_headings);
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if (ls->json)
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scols_table_set_name(tab, "namespaces");
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for (i = 0; i < ncolumns; i++) {
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const struct colinfo *col = get_column_info(i);
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int flags = col->flags;
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if (ls->notrunc)
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flags &= ~SCOLS_FL_TRUNC;
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if (ls->tree && get_column_id(i) == COL_COMMAND)
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flags |= SCOLS_FL_TREE;
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if (!scols_table_new_column(tab, col->name, col->whint, flags)) {
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warnx(_("failed to initialize output column"));
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goto err;
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}
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}
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return tab;
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err:
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scols_unref_table(tab);
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return NULL;
|
|
}
|
|
|
|
static int show_namespaces(struct lsns *ls)
|
|
{
|
|
struct libscols_table *tab;
|
|
struct list_head *p;
|
|
int rc = 0;
|
|
|
|
tab = init_scols_table(ls);
|
|
if (!tab)
|
|
return -ENOMEM;
|
|
|
|
list_for_each(p, &ls->namespaces) {
|
|
struct lsns_namespace *ns = list_entry(p, struct lsns_namespace, namespaces);
|
|
|
|
if (ls->fltr_pid != 0 && !namespace_has_process(ns, ls->fltr_pid))
|
|
continue;
|
|
|
|
add_scols_line(ls, tab, ns, ns->proc);
|
|
}
|
|
|
|
scols_print_table(tab);
|
|
scols_unref_table(tab);
|
|
return rc;
|
|
}
|
|
|
|
static void show_process(struct lsns *ls, struct libscols_table *tab,
|
|
struct lsns_process *proc, struct lsns_namespace *ns)
|
|
{
|
|
/*
|
|
* create a tree from parent->child relation, but only if the parent is
|
|
* within the same namespace
|
|
*/
|
|
if (ls->tree
|
|
&& proc->parent
|
|
&& !proc->parent->outline
|
|
&& proc->parent->ns_ids[ns->type] == proc->ns_ids[ns->type])
|
|
show_process(ls, tab, proc->parent, ns);
|
|
|
|
add_scols_line(ls, tab, ns, proc);
|
|
}
|
|
|
|
|
|
static int show_namespace_processes(struct lsns *ls, struct lsns_namespace *ns)
|
|
{
|
|
struct libscols_table *tab;
|
|
struct list_head *p;
|
|
|
|
tab = init_scols_table(ls);
|
|
if (!tab)
|
|
return -ENOMEM;
|
|
|
|
list_for_each(p, &ns->processes) {
|
|
struct lsns_process *proc = list_entry(p, struct lsns_process, ns_siblings[ns->type]);
|
|
|
|
if (!proc->outline)
|
|
show_process(ls, tab, proc, ns);
|
|
}
|
|
|
|
|
|
scols_print_table(tab);
|
|
scols_unref_table(tab);
|
|
return 0;
|
|
}
|
|
|
|
static void __attribute__ ((__noreturn__)) usage(FILE * out)
|
|
{
|
|
size_t i;
|
|
|
|
fputs(USAGE_HEADER, out);
|
|
|
|
fprintf(out,
|
|
_(" %s [options] [<namespace>]\n"), program_invocation_short_name);
|
|
|
|
fputs(USAGE_SEPARATOR, out);
|
|
fputs(_("List system namespaces.\n"), out);
|
|
|
|
fputs(USAGE_OPTIONS, out);
|
|
fputs(_(" -J, --json use JSON output format\n"), out);
|
|
fputs(_(" -l, --list use list format output\n"), out);
|
|
fputs(_(" -n, --noheadings don't print headings\n"), out);
|
|
fputs(_(" -o, --output <list> define which output columns to use\n"), out);
|
|
fputs(_(" -p, --task <pid> print process namespaces\n"), out);
|
|
fputs(_(" -r, --raw use the raw output format\n"), out);
|
|
fputs(_(" -u, --notruncate don't truncate text in columns\n"), out);
|
|
fputs(_(" -t, --type <name> namespace type (mnt, net, ipc, user, pid, uts, cgroup)\n"), out);
|
|
|
|
fputs(USAGE_SEPARATOR, out);
|
|
fputs(USAGE_HELP, out);
|
|
fputs(USAGE_VERSION, out);
|
|
|
|
fputs(_("\nAvailable columns (for --output):\n"), out);
|
|
|
|
for (i = 0; i < ARRAY_SIZE(infos); i++)
|
|
fprintf(out, " %11s %s\n", infos[i].name, _(infos[i].help));
|
|
|
|
fprintf(out, USAGE_MAN_TAIL("lsns(8)"));
|
|
|
|
exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
|
|
}
|
|
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
struct lsns ls;
|
|
int c;
|
|
int r = 0;
|
|
char *outarg = NULL;
|
|
static const struct option long_opts[] = {
|
|
{ "json", no_argument, NULL, 'J' },
|
|
{ "task", required_argument, NULL, 'p' },
|
|
{ "help", no_argument, NULL, 'h' },
|
|
{ "output", required_argument, NULL, 'o' },
|
|
{ "notruncate", no_argument, NULL, 'u' },
|
|
{ "version", no_argument, NULL, 'V' },
|
|
{ "noheadings", no_argument, NULL, 'n' },
|
|
{ "list", no_argument, NULL, 'l' },
|
|
{ "raw", no_argument, NULL, 'r' },
|
|
{ "type", required_argument, NULL, 't' },
|
|
{ NULL, 0, NULL, 0 }
|
|
};
|
|
|
|
static const ul_excl_t excl[] = { /* rows and cols in ASCII order */
|
|
{ 'J','r' },
|
|
{ 0 }
|
|
};
|
|
int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT;
|
|
|
|
setlocale(LC_ALL, "");
|
|
bindtextdomain(PACKAGE, LOCALEDIR);
|
|
textdomain(PACKAGE);
|
|
atexit(close_stdout);
|
|
|
|
lsns_init_debug();
|
|
memset(&ls, 0, sizeof(ls));
|
|
|
|
INIT_LIST_HEAD(&ls.processes);
|
|
INIT_LIST_HEAD(&ls.namespaces);
|
|
|
|
while ((c = getopt_long(argc, argv,
|
|
"Jlp:o:nruhVt:", long_opts, NULL)) != -1) {
|
|
|
|
err_exclusive_options(c, long_opts, excl, excl_st);
|
|
|
|
switch(c) {
|
|
case 'J':
|
|
ls.json = 1;
|
|
break;
|
|
case 'l':
|
|
ls.list = 1;
|
|
break;
|
|
case 'o':
|
|
outarg = optarg;
|
|
break;
|
|
case 'V':
|
|
printf(UTIL_LINUX_VERSION);
|
|
return EXIT_SUCCESS;
|
|
case 'p':
|
|
ls.fltr_pid = strtos32_or_err(optarg, _("invalid PID argument"));
|
|
break;
|
|
case 'h':
|
|
usage(stdout);
|
|
case 'n':
|
|
ls.no_headings = 1;
|
|
break;
|
|
case 'r':
|
|
ls.raw = 1;
|
|
break;
|
|
case 'u':
|
|
ls.notrunc = 1;
|
|
break;
|
|
case 't':
|
|
{
|
|
int type = ns_name2type(optarg);
|
|
if (type < 0)
|
|
errx(EXIT_FAILURE, _("unknown namespace type: %s"), optarg);
|
|
ls.fltr_types[type] = 1;
|
|
ls.fltr_ntypes++;
|
|
break;
|
|
}
|
|
default:
|
|
errtryhelp(EXIT_FAILURE);
|
|
}
|
|
}
|
|
|
|
if (!ls.fltr_ntypes) {
|
|
size_t i;
|
|
for (i = 0; i < ARRAY_SIZE(ns_names); i++)
|
|
ls.fltr_types[i] = 1;
|
|
}
|
|
|
|
if (optind < argc) {
|
|
if (ls.fltr_pid)
|
|
errx(EXIT_FAILURE, _("--task is mutually exclusive with <namespace>"));
|
|
ls.fltr_ns = strtou64_or_err(argv[optind], _("invalid namespace argument"));
|
|
ls.tree = ls.list ? 0 : 1;
|
|
|
|
if (!ncolumns) {
|
|
columns[ncolumns++] = COL_PID;
|
|
columns[ncolumns++] = COL_PPID;
|
|
columns[ncolumns++] = COL_USER;
|
|
columns[ncolumns++] = COL_COMMAND;
|
|
}
|
|
}
|
|
|
|
if (!ncolumns) {
|
|
columns[ncolumns++] = COL_NS;
|
|
columns[ncolumns++] = COL_TYPE;
|
|
columns[ncolumns++] = COL_NPROCS;
|
|
columns[ncolumns++] = COL_PID;
|
|
columns[ncolumns++] = COL_USER;
|
|
columns[ncolumns++] = COL_COMMAND;
|
|
}
|
|
|
|
if (outarg && string_add_to_idarray(outarg, columns, ARRAY_SIZE(columns),
|
|
&ncolumns, column_name_to_id) < 0)
|
|
return EXIT_FAILURE;
|
|
|
|
scols_init_debug(0);
|
|
|
|
uid_cache = new_idcache();
|
|
if (!uid_cache)
|
|
err(EXIT_FAILURE, _("failed to allocate UID cache"));
|
|
|
|
r = read_processes(&ls);
|
|
if (!r)
|
|
r = read_namespaces(&ls);
|
|
if (!r) {
|
|
if (ls.fltr_ns) {
|
|
struct lsns_namespace *ns = get_namespace(&ls, ls.fltr_ns);
|
|
|
|
if (!ns)
|
|
errx(EXIT_FAILURE, _("not found namespace: %ju"), (uintmax_t) ls.fltr_ns);
|
|
r = show_namespace_processes(&ls, ns);
|
|
} else
|
|
r = show_namespaces(&ls);
|
|
}
|
|
|
|
free_idcache(uid_cache);
|
|
return r == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
|
|
}
|