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-rw-r--r--procfs/process.c414
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diff --git a/procfs/process.c b/procfs/process.c
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-/* Hurd /proc filesystem, implementation of process directories.
- Copyright (C) 2010 Free Software Foundation, Inc.
-
- This file is part of the GNU Hurd.
-
- The GNU Hurd is free software; you can redistribute it and/or
- modify it under the terms of the GNU General Public License as
- published by the Free Software Foundation; either version 2, or (at
- your option) any later version.
-
- The GNU Hurd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <hurd/process.h>
-#include <hurd/resource.h>
-#include <mach/vm_param.h>
-#include <ps.h>
-#include "procfs.h"
-#include "procfs_dir.h"
-#include "process.h"
-#include "main.h"
-
-/* This module implements the process directories and the files they
- contain. A libps proc_stat structure is created for each process
- node, and is used by the individual file content generators as a
- source of information. Each possible file (cmdline, environ, ...) is
- decribed in a process_file_desc structure, which specifies which bits
- of information (ie. libps flags) it needs, and what function should
- be used to generate the file's contents.
-
- The content generators are defined first, followed by glue logic and
- entry table. */
-
-
-/* Helper functions */
-
-static char state_char (struct proc_stat *ps)
-{
- int i;
-
- for (i = 0; (1 << i) & (PSTAT_STATE_P_STATES | PSTAT_STATE_T_STATES); i++)
- if (proc_stat_state (ps) & (1 << i))
- return proc_stat_state_tags[i];
-
- return '?';
-}
-
-static const char *state_string (struct proc_stat *ps)
-{
- static const char *const state_strings[] = {
- "T (stopped)",
- "Z (zombie)",
- "R (running)",
- "H (halted)",
- "D (disk sleep)",
- "S (sleeping)",
- "I (idle)",
- NULL
- };
- int i;
-
- for (i = 0; state_strings[i]; i++)
- if (proc_stat_state (ps) & (1 << i))
- return state_strings[i];
-
- return "? (unknown)";
-}
-
-static long long int timeval_jiffies (time_value_t tv)
-{
- double secs = tv.seconds * 1000000. + tv.microseconds;
- return secs * opt_clk_tck / 1000000.;
-}
-
-static const char *args_filename (const char *name)
-{
- char *sp = strrchr (name, '/');
- return sp != NULL && *(sp + 1) != '\0' ? sp + 1 : name;
-}
-
-static int args_filename_length (const char *name)
-{
- return strchrnul (name, ' ') - name;
-}
-
-/* Actual content generators */
-
-static ssize_t
-process_file_gc_cmdline (struct proc_stat *ps, char **contents)
-{
- *contents = proc_stat_args(ps);
- return proc_stat_args_len(ps);
-}
-
-static ssize_t
-process_file_gc_environ (struct proc_stat *ps, char **contents)
-{
- *contents = proc_stat_env(ps);
- return proc_stat_env_len(ps);
-}
-
-static ssize_t
-process_file_gc_stat (struct proc_stat *ps, char **contents)
-{
- struct procinfo *pi = proc_stat_proc_info (ps);
- task_basic_info_t tbi = proc_stat_task_basic_info (ps);
- thread_basic_info_t thbi = proc_stat_thread_basic_info (ps);
- const char *fn = args_filename (proc_stat_args (ps));
-
- vm_address_t start_code = 1; /* 0 would make killall5.c consider it
- a kernel process, thus use 1 as
- default. */
- vm_address_t end_code = 1;
- process_t p;
- error_t err = proc_pid2proc (ps->context->server, ps->pid, &p);
- if (! err)
- {
- boolean_t essential = 0;
- proc_is_important (p, &essential);
- if (essential)
- start_code = end_code = 0; /* To make killall5.c consider it a
- kernel process that is to be
- left alone. */
- else
- proc_get_code (p, &start_code, &end_code);
-
- mach_port_deallocate (mach_task_self (), p);
- }
-
- /* See proc(5) for more information about the contents of each field for the
- Linux procfs. */
- return asprintf (contents,
- "%d (%.*s) %c " /* pid, command, state */
- "%d %d %d " /* ppid, pgid, session */
- "%d %d " /* controling tty stuff */
- "%u " /* flags, as defined by <linux/sched.h> */
- "%lu %lu %lu %lu " /* page fault counts */
- "%lu %lu %ld %ld " /* user/sys times, in sysconf(_SC_CLK_TCK) */
- "%d %d " /* scheduler params (priority, nice) */
- "%d %ld " /* number of threads, [obsolete] */
- "%llu " /* start time since boot (jiffies) */
- "%lu %ld %lu " /* virtual size (bytes), rss (pages), rss lim */
- "%lu %lu %lu %lu %lu " /* some vm addresses (code, stack, sp, pc) */
- "%lu %lu %lu %lu " /* pending, blocked, ignored and caught sigs */
- "%lu " /* wait channel */
- "%lu %lu " /* swap usage (not maintained in Linux) */
- "%d " /* exit signal, to be sent to the parent */
- "%d " /* last processor used */
- "%u %u " /* RT priority and policy */
- "%llu " /* aggregated block I/O delay */
- "\n",
- proc_stat_pid (ps), args_filename_length (fn), fn, state_char (ps),
- pi->ppid, pi->pgrp, pi->session,
- 0, 0, /* no such thing as a major:minor for ctty */
- 0, /* no such thing as CLONE_* flags on Hurd */
- 0L, 0L, 0L, 0L, /* TASK_EVENTS_INFO is unavailable on GNU Mach */
- (long unsigned) timeval_jiffies (thbi->user_time),
- (long unsigned) timeval_jiffies (thbi->system_time),
- 0L, 0L, /* cumulative time for children */
- MACH_PRIORITY_TO_NICE(thbi->base_priority) + 20,
- MACH_PRIORITY_TO_NICE(thbi->base_priority),
- pi->nthreads, 0L,
- timeval_jiffies (thbi->creation_time), /* FIXME: ... since boot */
- (long unsigned) tbi->virtual_size,
- (long unsigned) tbi->resident_size / PAGE_SIZE, 0L,
- start_code,
- end_code,
- 0L, 0L, 0L,
- 0L, 0L, 0L, 0L,
- (long unsigned) proc_stat_thread_rpc (ps), /* close enough */
- 0L, 0L,
- 0,
- 0,
- 0, 0,
- 0LL);
-}
-
-static ssize_t
-process_file_gc_statm (struct proc_stat *ps, char **contents)
-{
- task_basic_info_t tbi = proc_stat_task_basic_info (ps);
-
- return asprintf (contents,
- "%lu %lu 0 0 0 0 0\n",
- tbi->virtual_size / sysconf(_SC_PAGE_SIZE),
- tbi->resident_size / sysconf(_SC_PAGE_SIZE));
-}
-
-static ssize_t
-process_file_gc_status (struct proc_stat *ps, char **contents)
-{
- task_basic_info_t tbi = proc_stat_task_basic_info (ps);
- const char *fn = args_filename (proc_stat_args (ps));
-
- return asprintf (contents,
- "Name:\t%.*s\n"
- "State:\t%s\n"
- "Tgid:\t%u\n"
- "Pid:\t%u\n"
- "PPid:\t%u\n"
- "Uid:\t%u\t%u\t%u\t%u\n"
- "VmSize:\t%8u kB\n"
- "VmPeak:\t%8u kB\n"
- "VmRSS:\t%8u kB\n"
- "VmHWM:\t%8u kB\n" /* ie. resident peak */
- "Threads:\t%u\n",
- args_filename_length (fn), fn,
- state_string (ps),
- proc_stat_pid (ps), /* XXX will need more work for threads */
- proc_stat_pid (ps),
- proc_stat_proc_info (ps)->ppid,
- proc_stat_owner_uid (ps),
- proc_stat_owner_uid (ps),
- proc_stat_owner_uid (ps),
- proc_stat_owner_uid (ps),
- tbi->virtual_size / 1024,
- tbi->virtual_size / 1024,
- tbi->resident_size / 1024,
- tbi->resident_size / 1024,
- proc_stat_num_threads (ps));
-}
-
-
-/* Implementation of the file nodes. */
-
-/* Describes a file in the process directories. This structure is
- filled in as an "entry hook" in our procfs_dir entry table and is
- passed to the process_file_make_node function defined below. */
-struct process_file_desc
-{
- /* The proc_stat information required to get the contents of this file. */
- ps_flags_t needs;
-
- /* Content generator to use for this file. Once we have acquired the
- necessary information, there can be only memory allocation errors,
- hence this simplified signature. */
- ssize_t (*get_contents) (struct proc_stat *ps, char **contents);
-
- /* The cmdline and environ contents don't need any cleaning since they
- point directly into the proc_stat structure. */
- int no_cleanup;
-
- /* If specified, the file mode to be set with procfs_node_chmod(). */
- mode_t mode;
-};
-
-struct process_file_node
-{
- const struct process_file_desc *desc;
- struct proc_stat *ps;
-};
-
-/* FIXME: lock the parent! */
-static error_t
-process_file_get_contents (void *hook, char **contents, ssize_t *contents_len)
-{
- struct process_file_node *file = hook;
- error_t err;
-
- /* Fetch the required information. */
- err = proc_stat_set_flags (file->ps, file->desc->needs);
- if (err)
- return EIO;
- if ((proc_stat_flags (file->ps) & file->desc->needs) != file->desc->needs)
- return EIO;
-
- /* Call the actual content generator (see the definitions below). */
- *contents_len = file->desc->get_contents (file->ps, contents);
- return 0;
-}
-
-static void
-process_file_cleanup_contents (void *hook, char *contents, ssize_t len)
-{
- struct process_file_node *file = hook;
-
- if (! file->desc->no_cleanup)
- free (contents);
-}
-
-static struct node *
-process_file_make_node (void *dir_hook, const void *entry_hook)
-{
- static const struct procfs_node_ops ops = {
- .get_contents = process_file_get_contents,
- .cleanup_contents = process_file_cleanup_contents,
- .cleanup = free,
- };
- struct process_file_node *f;
- struct node *np;
-
- f = malloc (sizeof *f);
- if (! f)
- return NULL;
-
- f->desc = entry_hook;
- f->ps = dir_hook;
-
- np = procfs_make_node (&ops, f);
- if (! np)
- return NULL;
-
- procfs_node_chown (np, proc_stat_owner_uid (f->ps));
- if (f->desc->mode)
- procfs_node_chmod (np, f->desc->mode);
-
- return np;
-}
-
-/* Stat needs its own constructor in oreder to set its mode according to
- the --stat-mode command-line option. */
-static struct node *
-process_stat_make_node (void *dir_hook, const void *entry_hook)
-{
- struct node *np = process_file_make_node (dir_hook, entry_hook);
- if (np) procfs_node_chmod (np, opt_stat_mode);
- return np;
-}
-
-
-/* Implementation of the process directory per se. */
-
-static struct procfs_dir_entry entries[] = {
- {
- .name = "cmdline",
- .hook = & (struct process_file_desc) {
- .get_contents = process_file_gc_cmdline,
- .needs = PSTAT_ARGS,
- .no_cleanup = 1,
- },
- },
- {
- .name = "environ",
- .hook = & (struct process_file_desc) {
- .get_contents = process_file_gc_environ,
- .needs = PSTAT_ENV,
- .no_cleanup = 1,
- .mode = 0400,
- },
- },
- {
- .name = "stat",
- .hook = & (struct process_file_desc) {
- .get_contents = process_file_gc_stat,
- .needs = PSTAT_PID | PSTAT_ARGS | PSTAT_STATE | PSTAT_PROC_INFO
- | PSTAT_TASK | PSTAT_TASK_BASIC | PSTAT_THREAD_BASIC
- | PSTAT_THREAD_WAIT,
- },
- .ops = {
- .make_node = process_stat_make_node,
- }
- },
- {
- .name = "statm",
- .hook = & (struct process_file_desc) {
- .get_contents = process_file_gc_statm,
- .needs = PSTAT_TASK_BASIC,
- },
- },
- {
- .name = "status",
- .hook = & (struct process_file_desc) {
- .get_contents = process_file_gc_status,
- .needs = PSTAT_PID | PSTAT_ARGS | PSTAT_STATE | PSTAT_PROC_INFO
- | PSTAT_TASK_BASIC | PSTAT_OWNER_UID | PSTAT_NUM_THREADS,
- },
- },
- {}
-};
-
-error_t
-process_lookup_pid (struct ps_context *pc, pid_t pid, struct node **np)
-{
- static const struct procfs_dir_ops dir_ops = {
- .entries = entries,
- .cleanup = (void (*)(void *)) _proc_stat_free,
- .entry_ops = {
- .make_node = process_file_make_node,
- },
- };
- struct proc_stat *ps;
- int owner;
- error_t err;
-
- err = _proc_stat_create (pid, pc, &ps);
- if (err == ESRCH)
- return ENOENT;
- if (err)
- return EIO;
-
- err = proc_stat_set_flags (ps, PSTAT_OWNER_UID);
- if (err || ! (proc_stat_flags (ps) & PSTAT_OWNER_UID))
- {
- _proc_stat_free (ps);
- return EIO;
- }
-
- *np = procfs_dir_make_node (&dir_ops, ps);
- if (! *np)
- return ENOMEM;
-
- owner = proc_stat_owner_uid (ps);
- procfs_node_chown (*np, owner >= 0 ? owner : opt_anon_owner);
- return 0;
-}
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