| 1 | |
| 2 | * linux/fs/proc/array.c
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| 3 | *
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| 4 | * Copyright (C) 1992 by Linus Torvalds
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| 5 | * based on ideas by Darren Senn
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| 6 | *
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| 7 | * Fixes:
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| 8 | * Michael. K. Johnson: stat,statm extensions.
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| 9 | * <[email protected]>
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| 10 | *
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| 11 | * Pauline Middelink : Made cmdline,envline only break at '\0's, to
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| 12 | * make sure SET_PROCTITLE works. Also removed
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| 13 | * bad '!' which forced address recalculation for
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| 14 | * EVERY character on the current page.
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| 15 | * <[email protected]>
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| 16 | *
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| 17 | * Danny ter Haar : added cpuinfo
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| 18 | * <[email protected]>
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| 19 | *
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| 20 | * Alessandro Rubini : profile extension.
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| 21 | * <[email protected]>
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| 22 | *
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| 23 | * Jeff Tranter : added BogoMips field to cpuinfo
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| 24 | * <[email protected]>
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| 25 | *
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| 26 | * Bruno Haible : remove 4K limit for the maps file
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| 27 | * <[email protected]>
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| 28 | *
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| 29 | * Yves Arrouye : remove removal of trailing spaces in get_array.
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| 30 | * <[email protected]>
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| 31 | *
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| 32 | * Jerome Forissier : added per-CPU time information to /proc/stat
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| 33 | * and /proc/<pid>/cpu extension
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| 34 | * <[email protected]>
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| 35 | * - Incorporation and non-SMP safe operation
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| 36 | * of forissier patch in 2.1.78 by
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| 37 | * Hans Marcus <[email protected]>
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| 38 | *
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| 39 | * [email protected] : /proc/partitions
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| 40 | *
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| 41 | *
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| 42 | * Alan Cox : security fixes.
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| 43 | * <[email protected]>
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| 44 | *
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| 45 | * Al Viro : safe handling of mm_struct
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| 46 | *
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| 47 | * Gerhard Wichert : added BIGMEM support
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| 48 | * Siemens AG <[email protected]>
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| 49 | *
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| 50 | * Al Viro & Jeff Garzik : moved most of the thing into base.c and
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| 51 | * : proc_misc.c. The rest may eventually go into
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| 52 | * : base.c too.
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| 53 |
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| 54 |
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| 55 | #include <linux/types.h>
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| 56 | #include <linux/errno.h>
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| 57 | #include <linux/time.h>
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| 58 | #include <linux/kernel.h>
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| 59 | #include <linux/kernel_stat.h>
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| 60 | #include <linux/tty.h>
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| 61 | #include <linux/string.h>
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| 62 | #include <linux/mman.h>
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| 63 | #include <linux/proc_fs.h>
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| 64 | #include <linux/ioport.h>
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| 65 | #include <linux/uaccess.h>
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| 66 | #include <linux/io.h>
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| 67 | #include <linux/mm.h>
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| 68 | #include <linux/hugetlb.h>
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| 69 | #include <linux/pagemap.h>
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| 70 | #include <linux/swap.h>
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| 71 | #include <linux/smp.h>
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| 72 | #include <linux/signal.h>
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| 73 | #include <linux/highmem.h>
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| 74 | #include <linux/file.h>
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| 75 | #include <linux/fdtable.h>
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| 76 | #include <linux/times.h>
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| 77 | #include <linux/cpuset.h>
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| 78 | #include <linux/rcupdate.h>
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| 79 | #include <linux/delayacct.h>
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| 80 | #include <linux/seq_file.h>
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| 81 | #include <linux/pid_namespace.h>
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| 82 | #include <linux/ptrace.h>
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| 83 | #include <linux/tracehook.h>
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| 84 |
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| 85 | #include <asm/pgtable.h>
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| 86 | #include <asm/processor.h>
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| 87 | #include "internal.h"
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| 88 |
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| 89 | static inline void task_name(struct seq_file *m, struct task_struct *p)
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| 90 | {
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| 91 | int i;
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| 92 | char *buf, *end;
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| 93 | char *name;
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| 94 | char tcomm[sizeof(p->comm)];
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| 95 |
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| 96 | get_task_comm(tcomm, p);
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| 97 |
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| 98 | seq_puts(m, "Name:\t");
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| 99 | end = m->buf + m->size;
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| 100 | buf = m->buf + m->count;
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| 101 | name = tcomm;
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| 102 | i = sizeof(tcomm);
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| 103 | while (i && (buf < end)) {
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| 104 | unsigned char c = *name;
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| 105 | name++;
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| 106 | i--;
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| 107 | *buf = c;
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| 108 | if (!c)
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| 109 | break;
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| 110 | if (c == '\\') {
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| 111 | buf++;
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| 112 | if (buf < end)
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| 113 | *buf++ = c;
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| 114 | continue;
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| 115 | }
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| 116 | if (c == '\n') {
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| 117 | *buf++ = '\\';
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| 118 | if (buf < end)
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| 119 | *buf++ = 'n';
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| 120 | continue;
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| 121 | }
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| 122 | buf++;
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| 123 | }
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| 124 | m->count = buf - m->buf;
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| 125 | seq_putc(m, '\n');
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| 126 | }
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| 127 |
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| 128 | |
| 129 | * The task state array is a strange "bitmap" of
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| 130 | * reasons to sleep. Thus "running" is zero, and
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| 131 | * you can test for combinations of others with
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| 132 | * simple bit tests.
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| 133 |
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| 134 | static const char * const task_state_array[] = {
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| 135 | "R (running)",
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| 136 | "S (sleeping)",
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| 137 | "D (disk sleep)",
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| 138 | "T (stopped)",
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| 139 | "t (tracing stop)",
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| 140 | "Z (zombie)",
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| 141 | "X (dead)",
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| 142 | "x (dead)",
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| 143 | "K (wakekill)",
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| 144 | "W (waking)",
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| 145 | };
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| 146 |
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| 147 | static inline const char *get_task_state(struct task_struct *tsk)
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| 148 | {
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| 149 | unsigned int state = (tsk->state & TASK_REPORT) | tsk->exit_state;
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| 150 | const char * const *p = &task_state_array[0];
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| 151 |
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| 152 | BUILD_BUG_ON(1 + ilog2(TASK_STATE_MAX) != ARRAY_SIZE(task_state_array));
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| 153 |
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| 154 | while (state) {
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| 155 | p++;
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| 156 | state >>= 1;
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| 157 | }
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| 158 | return *p;
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| 159 | }
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| 160 |
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| 161 | static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
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| 162 | struct pid *pid, struct task_struct *p)
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| 163 | {
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| 164 | struct group_info *group_info;
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| 165 | int g;
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| 166 | struct fdtable *fdt = NULL;
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| 167 | const struct cred *cred;
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| 168 | pid_t ppid, tpid;
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| 169 |
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| 170 | rcu_read_lock();
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| 171 | ppid = pid_alive(p) ?
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| 172 | task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;
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| 173 | tpid = 0;
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| 174 | if (pid_alive(p)) {
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| 175 | struct task_struct *tracer = tracehook_tracer_task(p);
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| 176 | if (tracer)
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| 177 | tpid = task_pid_nr_ns(tracer, ns);
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| 178 | }
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| 179 | cred = get_task_cred(p);
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| 180 | seq_printf(m,
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| 181 | "State:\t%s\n"
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| 182 | "Tgid:\t%d\n"
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| 183 | "Pid:\t%d\n"
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| 184 | "PPid:\t%d\n"
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| 185 | "TracerPid:\t%d\n"
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| 186 | "Uid:\t%d\t%d\t%d\t%d\n"
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| 187 | "Gid:\t%d\t%d\t%d\t%d\n",
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| 188 | get_task_state(p),
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| 189 | task_tgid_nr_ns(p, ns),
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| 190 | pid_nr_ns(pid, ns),
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| 191 | ppid, tpid,
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| 192 | cred->uid, cred->euid, cred->suid, cred->fsuid,
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| 193 | cred->gid, cred->egid, cred->sgid, cred->fsgid);
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| 194 |
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| 195 | task_lock(p);
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| 196 | if (p->files)
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| 197 | fdt = files_fdtable(p->files);
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| 198 | seq_printf(m,
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| 199 | "FDSize:\t%d\n"
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| 200 | "Groups:\t",
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| 201 | fdt ? fdt->max_fds : 0);
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| 202 | rcu_read_unlock();
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| 203 |
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| 204 | group_info = cred->group_info;
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| 205 | task_unlock(p);
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| 206 |
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| 207 | for (g = 0; g < min(group_info->ngroups, NGROUPS_SMALL); g++)
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| 208 | seq_printf(m, "%d ", GROUP_AT(group_info, g));
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| 209 | put_cred(cred);
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| 210 |
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| 211 | seq_putc(m, '\n');
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| 212 | }
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| 213 |
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| 214 | static void render_sigset_t(struct seq_file *m, const char *header,
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| 215 | sigset_t *set)
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| 216 | {
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| 217 | int i;
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| 218 |
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| 219 | seq_puts(m, header);
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| 220 |
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| 221 | i = _NSIG;
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| 222 | do {
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| 223 | int x = 0;
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| 224 |
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| 225 | i -= 4;
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| 226 | if (sigismember(set, i+1)) x |= 1;
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| 227 | if (sigismember(set, i+2)) x |= 2;
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| 228 | if (sigismember(set, i+3)) x |= 4;
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| 229 | if (sigismember(set, i+4)) x |= 8;
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| 230 | seq_printf(m, "%x", x);
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| 231 | } while (i >= 4);
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| 232 |
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| 233 | seq_putc(m, '\n');
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| 234 | }
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| 235 |
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| 236 | static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
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| 237 | sigset_t *catch)
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| 238 | {
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| 239 | struct k_sigaction *k;
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| 240 | int i;
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| 241 |
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| 242 | k = p->sighand->action;
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| 243 | for (i = 1; i <= _NSIG; ++i, ++k) {
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| 244 | if (k->sa.sa_handler == SIG_IGN)
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| 245 | sigaddset(ign, i);
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| 246 | else if (k->sa.sa_handler != SIG_DFL)
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| 247 | sigaddset(catch, i);
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| 248 | }
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| 249 | }
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| 250 |
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| 251 | static inline void task_sig(struct seq_file *m, struct task_struct *p)
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| 252 | {
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| 253 | unsigned long flags;
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| 254 | sigset_t pending, shpending, blocked, ignored, caught;
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| 255 | int num_threads = 0;
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| 256 | unsigned long qsize = 0;
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| 257 | unsigned long qlim = 0;
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| 258 |
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| 259 | sigemptyset(&pending);
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| 260 | sigemptyset(&shpending);
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| 261 | sigemptyset(&blocked);
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| 262 | sigemptyset(&ignored);
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| 263 | sigemptyset(&caught);
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| 264 |
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| 265 | if (lock_task_sighand(p, &flags)) {
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| 266 | pending = p->pending.signal;
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| 267 | shpending = p->signal->shared_pending.signal;
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| 268 | blocked = p->blocked;
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| 269 | collect_sigign_sigcatch(p, &ignored, &caught);
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| 270 | num_threads = get_nr_threads(p);
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| 271 | rcu_read_lock();
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| 272 | qsize = atomic_read(&__task_cred(p)->user->sigpending);
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| 273 | rcu_read_unlock();
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| 274 | qlim = task_rlimit(p, RLIMIT_SIGPENDING);
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| 275 | unlock_task_sighand(p, &flags);
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| 276 | }
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| 277 |
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| 278 | seq_printf(m, "Threads:\t%d\n", num_threads);
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| 279 | seq_printf(m, "SigQ:\t%lu/%lu\n", qsize, qlim);
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| 280 |
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| 281 |
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| 282 | render_sigset_t(m, "SigPnd:\t", &pending);
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| 283 | render_sigset_t(m, "ShdPnd:\t", &shpending);
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| 284 | render_sigset_t(m, "SigBlk:\t", &blocked);
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| 285 | render_sigset_t(m, "SigIgn:\t", &ignored);
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| 286 | render_sigset_t(m, "SigCgt:\t", &caught);
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| 287 | }
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| 288 |
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| 289 | static void render_cap_t(struct seq_file *m, const char *header,
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| 290 | kernel_cap_t *a)
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| 291 | {
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| 292 | unsigned __capi;
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| 293 |
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| 294 | seq_puts(m, header);
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| 295 | CAP_FOR_EACH_U32(__capi) {
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| 296 | seq_printf(m, "%08x",
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| 297 | a->cap[(_KERNEL_CAPABILITY_U32S-1) - __capi]);
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| 298 | }
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| 299 | seq_putc(m, '\n');
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| 300 | }
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| 301 |
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| 302 | static inline void task_cap(struct seq_file *m, struct task_struct *p)
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| 303 | {
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| 304 | const struct cred *cred;
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| 305 | kernel_cap_t cap_inheritable, cap_permitted, cap_effective, cap_bset;
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| 306 |
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| 307 | rcu_read_lock();
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| 308 | cred = __task_cred(p);
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| 309 | cap_inheritable = cred->cap_inheritable;
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| 310 | cap_permitted = cred->cap_permitted;
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| 311 | cap_effective = cred->cap_effective;
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| 312 | cap_bset = cred->cap_bset;
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| 313 | rcu_read_unlock();
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| 314 |
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| 315 | render_cap_t(m, "CapInh:\t", &cap_inheritable);
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| 316 | render_cap_t(m, "CapPrm:\t", &cap_permitted);
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| 317 | render_cap_t(m, "CapEff:\t", &cap_effective);
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| 318 | render_cap_t(m, "CapBnd:\t", &cap_bset);
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| 319 | }
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| 320 |
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| 321 | static inline void task_context_switch_counts(struct seq_file *m,
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| 322 | struct task_struct *p)
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| 323 | {
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| 324 | seq_printf(m, "voluntary_ctxt_switches:\t%lu\n"
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| 325 | "nonvoluntary_ctxt_switches:\t%lu\n",
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| 326 | p->nvcsw,
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| 327 | p->nivcsw);
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| 328 | }
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| 329 |
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| 330 | static void task_cpus_allowed(struct seq_file *m, struct task_struct *task)
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| 331 | {
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| 332 | seq_puts(m, "Cpus_allowed:\t");
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| 333 | seq_cpumask(m, &task->cpus_allowed);
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| 334 | seq_putc(m, '\n');
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| 335 | seq_puts(m, "Cpus_allowed_list:\t");
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| 336 | seq_cpumask_list(m, &task->cpus_allowed);
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| 337 | seq_putc(m, '\n');
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| 338 | }
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| 339 |
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| 340 | int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
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| 341 | struct pid *pid, struct task_struct *task)
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| 342 | {
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| 343 | struct mm_struct *mm = get_task_mm(task);
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| 344 |
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| 345 | task_name(m, task);
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| 346 | task_state(m, ns, pid, task);
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| 347 |
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| 348 | if (mm) {
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| 349 | task_mem(m, mm);
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| 350 | mmput(mm);
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| 351 | }
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| 352 | task_sig(m, task);
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| 353 | task_cap(m, task);
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| 354 | task_cpus_allowed(m, task);
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| 355 | cpuset_task_status_allowed(m, task);
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| 356 | task_context_switch_counts(m, task);
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| 357 | return 0;
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| 358 | }
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| 359 |
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| 360 | static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
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| 361 | struct pid *pid, struct task_struct *task, int whole)
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| 362 | {
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| 363 | unsigned long vsize, eip, esp, wchan = ~0UL;
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| 364 | long priority, nice;
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| 365 | int tty_pgrp = -1, tty_nr = 0;
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| 366 | sigset_t sigign, sigcatch;
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| 367 | char state;
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| 368 | pid_t ppid = 0, pgid = -1, sid = -1;
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| 369 | int num_threads = 0;
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| 370 | int permitted;
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| 371 | struct mm_struct *mm;
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| 372 | unsigned long long start_time;
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| 373 | unsigned long cmin_flt = 0, cmaj_flt = 0;
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| 374 | unsigned long min_flt = 0, maj_flt = 0;
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| 375 | cputime_t cutime, cstime, utime, stime;
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| 376 | cputime_t cgtime, gtime;
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| 377 | unsigned long rsslim = 0;
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| 378 | char tcomm[sizeof(task->comm)];
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| 379 | unsigned long flags;
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| 380 |
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| 381 | state = *get_task_state(task);
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| 382 | vsize = eip = esp = 0;
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| 383 | permitted = ptrace_may_access(task, PTRACE_MODE_READ);
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| 384 | mm = get_task_mm(task);
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| 385 | if (mm) {
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| 386 | vsize = task_vsize(mm);
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| 387 | if (permitted) {
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| 388 | eip = KSTK_EIP(task);
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| 389 | esp = KSTK_ESP(task);
|
| 390 | }
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| 391 | }
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| 392 |
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| 393 | get_task_comm(tcomm, task);
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| 394 |
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| 395 | sigemptyset(&sigign);
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| 396 | sigemptyset(&sigcatch);
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| 397 | cutime = cstime = utime = stime = cputime_zero;
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| 398 | cgtime = gtime = cputime_zero;
|
| 399 |
|
| 400 | if (lock_task_sighand(task, &flags)) {
|
| 401 | struct signal_struct *sig = task->signal;
|
| 402 |
|
| 403 | if (sig->tty) {
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| 404 | struct pid *pgrp = tty_get_pgrp(sig->tty);
|
| 405 | tty_pgrp = pid_nr_ns(pgrp, ns);
|
| 406 | put_pid(pgrp);
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| 407 | tty_nr = new_encode_dev(tty_devnum(sig->tty));
|
| 408 | }
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| 409 |
|
| 410 | num_threads = get_nr_threads(task);
|
| 411 | collect_sigign_sigcatch(task, &sigign, &sigcatch);
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| 412 |
|
| 413 | cmin_flt = sig->cmin_flt;
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| 414 | cmaj_flt = sig->cmaj_flt;
|
| 415 | cutime = sig->cutime;
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| 416 | cstime = sig->cstime;
|
| 417 | cgtime = sig->cgtime;
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| 418 | rsslim = ACCESS_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur);
|
| 419 |
|
| 420 |
|
| 421 | if (whole) {
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| 422 | struct task_struct *t = task;
|
| 423 | do {
|
| 424 | min_flt += t->min_flt;
|
| 425 | maj_flt += t->maj_flt;
|
| 426 | gtime = cputime_add(gtime, t->gtime);
|
| 427 | t = next_thread(t);
|
| 428 | } while (t != task);
|
| 429 |
|
| 430 | min_flt += sig->min_flt;
|
| 431 | maj_flt += sig->maj_flt;
|
| 432 | thread_group_times(task, &utime, &stime);
|
| 433 | gtime = cputime_add(gtime, sig->gtime);
|
| 434 | }
|
| 435 |
|
| 436 | sid = task_session_nr_ns(task, ns);
|
| 437 | ppid = task_tgid_nr_ns(task->real_parent, ns);
|
| 438 | pgid = task_pgrp_nr_ns(task, ns);
|
| 439 |
|
| 440 | unlock_task_sighand(task, &flags);
|
| 441 | }
|
| 442 |
|
| 443 | if (permitted && (!whole || num_threads < 2))
|
| 444 | wchan = get_wchan(task);
|
| 445 | if (!whole) {
|
| 446 | min_flt = task->min_flt;
|
| 447 | maj_flt = task->maj_flt;
|
| 448 | task_times(task, &utime, &stime);
|
| 449 | gtime = task->gtime;
|
| 450 | }
|
| 451 |
|
| 452 |
|
| 453 |
|
| 454 | priority = task_prio(task);
|
| 455 | nice = task_nice(task);
|
| 456 |
|
| 457 |
|
| 458 |
|
| 459 | start_time =
|
| 460 | (unsigned long long)task->real_start_time.tv_sec * NSEC_PER_SEC
|
| 461 | + task->real_start_time.tv_nsec;
|
| 462 |
|
| 463 | start_time = nsec_to_clock_t(start_time);
|
| 464 |
|
| 465 | seq_printf(m, "%d (%s) %c %d %d %d %d %d %u %lu \
|
| 466 | %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
|
| 467 | %lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld\n",
|
| 468 | pid_nr_ns(pid, ns),
|
| 469 | tcomm,
|
| 470 | state,
|
| 471 | ppid,
|
| 472 | pgid,
|
| 473 | sid,
|
| 474 | tty_nr,
|
| 475 | tty_pgrp,
|
| 476 | task->flags,
|
| 477 | min_flt,
|
| 478 | cmin_flt,
|
| 479 | maj_flt,
|
| 480 | cmaj_flt,
|
| 481 | cputime_to_clock_t(utime),
|
| 482 | cputime_to_clock_t(stime),
|
| 483 | cputime_to_clock_t(cutime),
|
| 484 | cputime_to_clock_t(cstime),
|
| 485 | priority,
|
| 486 | nice,
|
| 487 | num_threads,
|
| 488 | start_time,
|
| 489 | vsize,
|
| 490 | mm ? get_mm_rss(mm) : 0,
|
| 491 | rsslim,
|
| 492 | mm ? (permitted ? mm->start_code : 1) : 0,
|
| 493 | mm ? (permitted ? mm->end_code : 1) : 0,
|
| 494 | (permitted && mm) ? mm->start_stack : 0,
|
| 495 | esp,
|
| 496 | eip,
|
| 497 | |
| 498 | * It must be decimal for Linux 2.0 compatibility.
|
| 499 | * Use /proc/#/status for real-time signals.
|
| 500 |
|
| 501 | task->pending.signal.sig[0] & 0x7fffffffUL,
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| 502 | task->blocked.sig[0] & 0x7fffffffUL,
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| 503 | sigign .sig[0] & 0x7fffffffUL,
|
| 504 | sigcatch .sig[0] & 0x7fffffffUL,
|
| 505 | wchan,
|
| 506 | 0UL,
|
| 507 | 0UL,
|
| 508 | task->exit_signal,
|
| 509 | task_cpu(task),
|
| 510 | task->rt_priority,
|
| 511 | task->policy,
|
| 512 | (unsigned long long)delayacct_blkio_ticks(task),
|
| 513 | cputime_to_clock_t(gtime),
|
| 514 | cputime_to_clock_t(cgtime));
|
| 515 | if (mm)
|
| 516 | mmput(mm);
|
| 517 | return 0;
|
| 518 | }
|
| 519 |
|
| 520 | int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
|
| 521 | struct pid *pid, struct task_struct *task)
|
| 522 | {
|
| 523 | return do_task_stat(m, ns, pid, task, 0);
|
| 524 | }
|
| 525 |
|
| 526 | int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
|
| 527 | struct pid *pid, struct task_struct *task)
|
| 528 | {
|
| 529 | return do_task_stat(m, ns, pid, task, 1);
|
| 530 | }
|
| 531 |
|
| 532 | int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
|
| 533 | struct pid *pid, struct task_struct *task)
|
| 534 | {
|
| 535 | unsigned long size = 0, resident = 0, shared = 0, text = 0, data = 0;
|
| 536 | struct mm_struct *mm = get_task_mm(task);
|
| 537 |
|
| 538 | if (mm) {
|
| 539 | size = task_statm(mm, &shared, &text, &data, &resident);
|
| 540 | mmput(mm);
|
| 541 | }
|
| 542 | seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n",
|
| 543 | size, resident, shared, text, data);
|
| 544 |
|
| 545 | return 0;
|
| 546 | }
|