/* * linux/fs/proc/array.c * * Copyright (C) 1992 by Linus Torvalds * based on ideas by Darren Senn * * Fixes: * Michael. K. Johnson: stat,statm extensions. * <johnsonm@stolaf.edu> * * Pauline Middelink : Made cmdline,envline only break at '\0's, to * make sure SET_PROCTITLE works. Also removed * bad '!' which forced address recalculation for * EVERY character on the current page. * <middelin@polyware.iaf.nl> * * Danny ter Haar : added cpuinfo * <dth@cistron.nl> * * Alessandro Rubini : profile extension. * <rubini@ipvvis.unipv.it> * * Jeff Tranter : added BogoMips field to cpuinfo * <Jeff_Tranter@Mitel.COM> * * Bruno Haible : remove 4K limit for the maps file * <haible@ma2s2.mathematik.uni-karlsruhe.de> * * Yves Arrouye : remove removal of trailing spaces in get_array. * <Yves.Arrouye@marin.fdn.fr> * * Jerome Forissier : added per-CPU time information to /proc/stat * and /proc/<pid>/cpu extension * <forissier@isia.cma.fr> * - Incorporation and non-SMP safe operation * of forissier patch in 2.1.78 by * Hans Marcus <crowbar@concepts.nl> * * aeb@cwi.nl : /proc/partitions * * * Alan Cox : security fixes. * <alan@lxorguk.ukuu.org.uk> * * Al Viro : safe handling of mm_struct * * Gerhard Wichert : added BIGMEM support * Siemens AG <Gerhard.Wichert@pdb.siemens.de> * * Al Viro & Jeff Garzik : moved most of the thing into base.c and * : proc_misc.c. The rest may eventually go into * : base.c too. */ #include <linux/types.h> #include <linux/errno.h> #include <linux/time.h> #include <linux/kernel.h> #include <linux/kernel_stat.h> #include <linux/tty.h> #include <linux/string.h> #include <linux/mman.h> #include <linux/proc_fs.h> #include <linux/ioport.h> #include <linux/uaccess.h> #include <linux/io.h> #include <linux/mm.h> #include <linux/hugetlb.h> #include <linux/pagemap.h> #include <linux/swap.h> #include <linux/smp.h> #include <linux/signal.h> #include <linux/highmem.h> #include <linux/file.h> #include <linux/fdtable.h> #include <linux/times.h> #include <linux/cpuset.h> #include <linux/rcupdate.h> #include <linux/delayacct.h> #include <linux/seq_file.h> #include <linux/pid_namespace.h> #include <linux/ptrace.h> #include <linux/tracehook.h> #include <asm/pgtable.h> #include <asm/processor.h> #include "internal.h" static inline void task_name(struct seq_file *m, struct task_struct *p) { int i; char *buf, *end; char *name; char tcomm[sizeof(p->comm)]; get_task_comm(tcomm, p); seq_puts(m, "Name:\t"); end = m->buf + m->size; buf = m->buf + m->count; name = tcomm; i = sizeof(tcomm); while (i && (buf < end)) { unsigned char c = *name; name++; i--; *buf = c; if (!c) break; if (c == '\\') { buf++; if (buf < end) *buf++ = c; continue; } if (c == '\n') { *buf++ = '\\'; if (buf < end) *buf++ = 'n'; continue; } buf++; } m->count = buf - m->buf; seq_putc(m, '\n'); } /* * The task state array is a strange "bitmap" of * reasons to sleep. Thus "running" is zero, and * you can test for combinations of others with * simple bit tests. */ static const char *task_state_array[] = { "R (running)", /* 0 */ "S (sleeping)", /* 1 */ "D (disk sleep)", /* 2 */ "T (stopped)", /* 4 */ "t (tracing stop)", /* 8 */ "Z (zombie)", /* 16 */ "X (dead)", /* 32 */ "x (dead)", /* 64 */ "K (wakekill)", /* 128 */ "W (waking)", /* 256 */ }; static inline const char *get_task_state(struct task_struct *tsk) { unsigned int state = (tsk->state & TASK_REPORT) | tsk->exit_state; const char **p = &task_state_array[0]; BUILD_BUG_ON(1 + ilog2(TASK_STATE_MAX) != ARRAY_SIZE(task_state_array)); while (state) { p++; state >>= 1; } return *p; } static inline void task_state(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *p) { struct group_info *group_info; int g; struct fdtable *fdt = NULL; const struct cred *cred; pid_t ppid, tpid; rcu_read_lock(); ppid = pid_alive(p) ? task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0; tpid = 0; if (pid_alive(p)) { struct task_struct *tracer = tracehook_tracer_task(p); if (tracer) tpid = task_pid_nr_ns(tracer, ns); } cred = get_task_cred(p); seq_printf(m, "State:\t%s\n" "Tgid:\t%d\n" "Pid:\t%d\n" "PPid:\t%d\n" "TracerPid:\t%d\n" "Uid:\t%d\t%d\t%d\t%d\n" "Gid:\t%d\t%d\t%d\t%d\n", get_task_state(p), task_tgid_nr_ns(p, ns), pid_nr_ns(pid, ns), ppid, tpid, cred->uid, cred->euid, cred->suid, cred->fsuid, cred->gid, cred->egid, cred->sgid, cred->fsgid); task_lock(p); if (p->files) fdt = files_fdtable(p->files); seq_printf(m, "FDSize:\t%d\n" "Groups:\t", fdt ? fdt->max_fds : 0); rcu_read_unlock(); group_info = cred->group_info; task_unlock(p); for (g = 0; g < min(group_info->ngroups, NGROUPS_SMALL); g++) seq_printf(m, "%d ", GROUP_AT(group_info, g)); put_cred(cred); seq_putc(m, '\n'); } static void render_sigset_t(struct seq_file *m, const char *header, sigset_t *set) { int i; seq_puts(m, header); i = _NSIG; do { int x = 0; i -= 4; if (sigismember(set, i+1)) x |= 1; if (sigismember(set, i+2)) x |= 2; if (sigismember(set, i+3)) x |= 4; if (sigismember(set, i+4)) x |= 8; seq_printf(m, "%x", x); } while (i >= 4); seq_putc(m, '\n'); } static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign, sigset_t *catch) { struct k_sigaction *k; int i; k = p->sighand->action; for (i = 1; i <= _NSIG; ++i, ++k) { if (k->sa.sa_handler == SIG_IGN) sigaddset(ign, i); else if (k->sa.sa_handler != SIG_DFL) sigaddset(catch, i); } } static inline void task_sig(struct seq_file *m, struct task_struct *p) { unsigned long flags; sigset_t pending, shpending, blocked, ignored, caught; int num_threads = 0; unsigned long qsize = 0; unsigned long qlim = 0; sigemptyset(&pending); sigemptyset(&shpending); sigemptyset(&blocked); sigemptyset(&ignored); sigemptyset(&caught); if (lock_task_sighand(p, &flags)) { pending = p->pending.signal; shpending = p->signal->shared_pending.signal; blocked = p->blocked; collect_sigign_sigcatch(p, &ignored, &caught); num_threads = get_nr_threads(p); rcu_read_lock(); /* FIXME: is this correct? */ qsize = atomic_read(&__task_cred(p)->user->sigpending); rcu_read_unlock(); qlim = task_rlimit(p, RLIMIT_SIGPENDING); unlock_task_sighand(p, &flags); } seq_printf(m, "Threads:\t%d\n", num_threads); seq_printf(m, "SigQ:\t%lu/%lu\n", qsize, qlim); /* render them all */ render_sigset_t(m, "SigPnd:\t", &pending); render_sigset_t(m, "ShdPnd:\t", &shpending); render_sigset_t(m, "SigBlk:\t", &blocked); render_sigset_t(m, "SigIgn:\t", &ignored); render_sigset_t(m, "SigCgt:\t", &caught); } static void render_cap_t(struct seq_file *m, const char *header, kernel_cap_t *a) { unsigned __capi; seq_puts(m, header); CAP_FOR_EACH_U32(__capi) { seq_printf(m, "%08x", a->cap[(_KERNEL_CAPABILITY_U32S-1) - __capi]); } seq_putc(m, '\n'); } static inline void task_cap(struct seq_file *m, struct task_struct *p) { const struct cred *cred; kernel_cap_t cap_inheritable, cap_permitted, cap_effective, cap_bset; rcu_read_lock(); cred = __task_cred(p); cap_inheritable = cred->cap_inheritable; cap_permitted = cred->cap_permitted; cap_effective = cred->cap_effective; cap_bset = cred->cap_bset; rcu_read_unlock(); render_cap_t(m, "CapInh:\t", &cap_inheritable); render_cap_t(m, "CapPrm:\t", &cap_permitted); render_cap_t(m, "CapEff:\t", &cap_effective); render_cap_t(m, "CapBnd:\t", &cap_bset); } static inline void task_context_switch_counts(struct seq_file *m, struct task_struct *p) { seq_printf(m, "voluntary_ctxt_switches:\t%lu\n" "nonvoluntary_ctxt_switches:\t%lu\n", p->nvcsw, p->nivcsw); } static void task_cpus_allowed(struct seq_file *m, struct task_struct *task) { seq_puts(m, "Cpus_allowed:\t"); seq_cpumask(m, &task->cpus_allowed); seq_putc(m, '\n'); seq_puts(m, "Cpus_allowed_list:\t"); seq_cpumask_list(m, &task->cpus_allowed); seq_putc(m, '\n'); } int proc_pid_status(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task) { struct mm_struct *mm = get_task_mm(task); task_name(m, task); task_state(m, ns, pid, task); if (mm) { task_mem(m, mm); mmput(mm); } task_sig(m, task); task_cap(m, task); task_cpus_allowed(m, task); cpuset_task_status_allowed(m, task); #if defined(CONFIG_S390) task_show_regs(m, task); #endif task_context_switch_counts(m, task); return 0; } static int do_task_stat(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task, int whole) { unsigned long vsize, eip, esp, wchan = ~0UL; long priority, nice; int tty_pgrp = -1, tty_nr = 0; sigset_t sigign, sigcatch; char state; pid_t ppid = 0, pgid = -1, sid = -1; int num_threads = 0; int permitted; struct mm_struct *mm; unsigned long long start_time; unsigned long cmin_flt = 0, cmaj_flt = 0; unsigned long min_flt = 0, maj_flt = 0; cputime_t cutime, cstime, utime, stime; cputime_t cgtime, gtime; unsigned long rsslim = 0; char tcomm[sizeof(task->comm)]; unsigned long flags; state = *get_task_state(task); vsize = eip = esp = 0; permitted = ptrace_may_access(task, PTRACE_MODE_READ); mm = get_task_mm(task); if (mm) { vsize = task_vsize(mm); if (permitted) { eip = KSTK_EIP(task); esp = KSTK_ESP(task); } } get_task_comm(tcomm, task); sigemptyset(&sigign); sigemptyset(&sigcatch); cutime = cstime = utime = stime = cputime_zero; cgtime = gtime = cputime_zero; if (lock_task_sighand(task, &flags)) { struct signal_struct *sig = task->signal; if (sig->tty) { struct pid *pgrp = tty_get_pgrp(sig->tty); tty_pgrp = pid_nr_ns(pgrp, ns); put_pid(pgrp); tty_nr = new_encode_dev(tty_devnum(sig->tty)); } num_threads = get_nr_threads(task); collect_sigign_sigcatch(task, &sigign, &sigcatch); cmin_flt = sig->cmin_flt; cmaj_flt = sig->cmaj_flt; cutime = sig->cutime; cstime = sig->cstime; cgtime = sig->cgtime; rsslim = ACCESS_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur); /* add up live thread stats at the group level */ if (whole) { struct task_struct *t = task; do { min_flt += t->min_flt; maj_flt += t->maj_flt; gtime = cputime_add(gtime, t->gtime); t = next_thread(t); } while (t != task); min_flt += sig->min_flt; maj_flt += sig->maj_flt; thread_group_times(task, &utime, &stime); gtime = cputime_add(gtime, sig->gtime); } sid = task_session_nr_ns(task, ns); ppid = task_tgid_nr_ns(task->real_parent, ns); pgid = task_pgrp_nr_ns(task, ns); unlock_task_sighand(task, &flags); } if (permitted && (!whole || num_threads < 2)) wchan = get_wchan(task); if (!whole) { min_flt = task->min_flt; maj_flt = task->maj_flt; task_times(task, &utime, &stime); gtime = task->gtime; } /* scale priority and nice values from timeslices to -20..20 */ /* to make it look like a "normal" Unix priority/nice value */ priority = task_prio(task); nice = task_nice(task); /* Temporary variable needed for gcc-2.96 */ /* convert timespec -> nsec*/ start_time = (unsigned long long)task->real_start_time.tv_sec * NSEC_PER_SEC + task->real_start_time.tv_nsec; /* convert nsec -> ticks */ start_time = nsec_to_clock_t(start_time); seq_printf(m, "%d (%s) %c %d %d %d %d %d %u %lu \ %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \ %lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld\n", pid_nr_ns(pid, ns), tcomm, state, ppid, pgid, sid, tty_nr, tty_pgrp, task->flags, min_flt, cmin_flt, maj_flt, cmaj_flt, cputime_to_clock_t(utime), cputime_to_clock_t(stime), cputime_to_clock_t(cutime), cputime_to_clock_t(cstime), priority, nice, num_threads, start_time, vsize, mm ? get_mm_rss(mm) : 0, rsslim, mm ? mm->start_code : 0, mm ? mm->end_code : 0, (permitted && mm) ? mm->start_stack : 0, esp, eip, /* The signal information here is obsolete. * It must be decimal for Linux 2.0 compatibility. * Use /proc/#/status for real-time signals. */ task->pending.signal.sig[0] & 0x7fffffffUL, task->blocked.sig[0] & 0x7fffffffUL, sigign .sig[0] & 0x7fffffffUL, sigcatch .sig[0] & 0x7fffffffUL, wchan, 0UL, 0UL, task->exit_signal, task_cpu(task), task->rt_priority, task->policy, (unsigned long long)delayacct_blkio_ticks(task), cputime_to_clock_t(gtime), cputime_to_clock_t(cgtime)); if (mm) mmput(mm); return 0; } int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task) { return do_task_stat(m, ns, pid, task, 0); } int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task) { return do_task_stat(m, ns, pid, task, 1); } int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task) { unsigned long size = 0, resident = 0, shared = 0, text = 0, data = 0; struct mm_struct *mm = get_task_mm(task); if (mm) { size = task_statm(mm, &shared, &text, &data, &resident); mmput(mm); } seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n", size, resident, shared, text, data); return 0; }