array.c

这是一个SIGMA方案的PMP播放器的UCLINUX程序,可播放DVD,VCD,CD MP3...有很好的参考价值.

/*
 *  linux/fs/proc/array.c
 *
 *  Copyright (C) 1992  by Linus Torvalds
 *  based on ideas by Darren Senn
 *
 * Fixes:
 * Michael. K. Johnson: stat,statm extensions.
 *                      <[e-mail]>
 *
 * 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.
 *                      <[e-mail]>
 *
 * Danny ter Haar    :	added cpuinfo
 *			<[e-mail]>
 *
 * Alessandro Rubini :  profile extension.
 *                      <[e-mail]>
 *
 * Jeff Tranter      :  added BogoMips field to cpuinfo
 *                      <[e-mail]>
 *
 * Bruno Haible      :  remove 4K limit for the maps file
 *			<[e-mail]>
 *
 * Yves Arrouye      :  remove removal of trailing spaces in get_array.
 *			<[e-mail]>
 *
 * Jerome Forissier  :  added per-CPU time information to /proc/stat
 *                      and /proc/<pid>/cpu extension
 *                      <[e-mail]>
 *			- Incorporation and non-SMP safe operation
 *			of forissier patch in 2.1.78 by
 *			Hans Marcus <[e-mail]>
 *
 * [e-mail]        :  /proc/partitions
 *
 *
 * Alan Cox	     :  security fixes.
 *			<[e-mail]>
 *
 * Al Viro           :  safe handling of mm_struct
 *
 * Gerhard Wichert   :  added BIGMEM support
 * Siemens AG           <[e-mail]>
 *
 * 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.
 *
 * David McCullough  :  added NO_MM support <[e-mail]>
 */

#include <linux/config.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/sched.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/mm.h>
#include <linux/pagemap.h>
#include <linux/swap.h>
#include <linux/slab.h>
#include <linux/smp.h>
#include <linux/signal.h>
#include <linux/highmem.h>

#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/io.h>
#include <asm/processor.h>

/* Gcc optimizes away "strlen(x)" for constant x */
#define ADDBUF(buffer, string) \
do { memcpy(buffer, string, strlen(string)); \
     buffer += strlen(string); } while (0)

static inline char * task_name(struct task_struct *p, char * buf)
{
	int i;
	char * name;

	ADDBUF(buf, "Name:\t");
	name = p->comm;
	i = sizeof(p->comm);
	do {
		unsigned char c = *name;
		name++;
		i--;
		*buf = c;
		if (!c)
			break;
		if (c == '\\') {
			buf[1] = c;
			buf += 2;
			continue;
		}
		if (c == '\n') {
			buf[0] = '\\';
			buf[1] = 'n';
			buf += 2;
			continue;
		}
		buf++;
	} while (i);
	*buf = '\n';
	return buf+1;
}

/*
 * 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 */
	"Z (zombie)",		/*  4 */
	"T (stopped)",		/*  8 */
	"W (paging)"		/* 16 */
};

static inline const char * get_task_state(struct task_struct *tsk)
{
	unsigned int state = tsk->state & (TASK_RUNNING |
					   TASK_INTERRUPTIBLE |
					   TASK_UNINTERRUPTIBLE |
					   TASK_ZOMBIE |
					   TASK_STOPPED);
	const char **p = &task_state_array[0];

	while (state) {
		p++;
		state >>= 1;
	}
	return *p;
}

static inline char * task_state(struct task_struct *p, char *buffer)
{
	int g;

	read_lock(&tasklist_lock);
	buffer += sprintf(buffer,
		"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), p->tgid,
		p->pid, p->pid ? p->p_opptr->pid : 0, 0,
		p->uid, p->euid, p->suid, p->fsuid,
		p->gid, p->egid, p->sgid, p->fsgid);
	read_unlock(&tasklist_lock);	
	task_lock(p);
	buffer += sprintf(buffer,
		"FDSize:\t%d\n"
		"Groups:\t",
		p->files ? p->files->max_fds : 0);
	task_unlock(p);

	for (g = 0; g < p->ngroups; g++)
		buffer += sprintf(buffer, "%d ", p->groups[g]);

	buffer += sprintf(buffer, "\n");
	return buffer;
}

static inline char * task_mem(struct mm_struct *mm, char *buffer)
{
#ifndef NO_MM
	struct vm_area_struct * vma;
	unsigned long data = 0, stack = 0;
	unsigned long exec = 0, lib = 0;

	down_read(&mm->mmap_sem);
	for (vma = mm->mmap; vma; vma = vma->vm_next) {
		unsigned long len = (vma->vm_end - vma->vm_start) >> 10;
		if (!vma->vm_file) {
			data += len;
			if (vma->vm_flags & VM_GROWSDOWN)
				stack += len;
			continue;
		}
		if (vma->vm_flags & VM_WRITE)
			continue;
		if (vma->vm_flags & VM_EXEC) {
			exec += len;
			if (vma->vm_flags & VM_EXECUTABLE)
				continue;
			lib += len;
		}
	}
	buffer += sprintf(buffer,
		"VmSize:\t%8lu kB\n"
		"VmLck:\t%8lu kB\n"
		"VmRSS:\t%8lu kB\n"
		"VmData:\t%8lu kB\n"
		"VmStk:\t%8lu kB\n"
		"VmExe:\t%8lu kB\n"
		"VmLib:\t%8lu kB\n",
		mm->total_vm << (PAGE_SHIFT-10),
		mm->locked_vm << (PAGE_SHIFT-10),
		mm->rss << (PAGE_SHIFT-10),
		data - stack, stack,
		exec - lib, lib);
	up_read(&mm->mmap_sem);
#else
	unsigned long bytes = 0, sbytes = 0, slack = 0;
	struct mm_tblock_struct * tblock;
        
	/* Logic: we've got two memory sums for each process, "shared", and
	 * "non-shared". Shared memory may get counted more then once, for
	 * each process that owns it. Non-shared memory is counted
	 * accurately.
	 *
	 *	-- Kenneth Albanowski
	 */

	down_read(&mm->mmap_sem);
	for (tblock = &mm->tblock; tblock; tblock = tblock->next) {
		if (tblock->rblock) {
			bytes += ksize(tblock);
			if (atomic_read(&mm->mm_count) > 1 ||
					tblock->rblock->refcount > 1) {
				sbytes += ksize(tblock->rblock->kblock);
				sbytes += ksize(tblock->rblock) ;
			} else {
				bytes += ksize(tblock->rblock->kblock);
				bytes += ksize(tblock->rblock) ;
				slack += ksize(tblock->rblock->kblock) - tblock->rblock->size;
			}
		}
	}
	
	((atomic_read(&mm->mm_count) > 1) ? sbytes : bytes)
			+= ksize(mm);
	(current->fs && atomic_read(&current->fs->count) > 1 ? sbytes : bytes)
			+= ksize(current->fs);
	(current->files && atomic_read(&current->files->count) > 1 ? sbytes : bytes)
			+= ksize(current->files);
	(current->sig && atomic_read(&current->sig->count) > 1 ? sbytes : bytes)
			+= ksize(current->sig);
	bytes += ksize(current); /* includes kernel stack */

	buffer += sprintf(buffer,
		"Mem:\t%8lu bytes\n"
		"Slack:\t%8lu bytes\n"
		"Shared:\t%8lu bytes\n",
		bytes,
		slack,
		sbytes);

	up_read(&mm->mmap_sem);
#endif
	return buffer;
}

static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
				    sigset_t *catch)
{
	struct k_sigaction *k;
	int i;

	sigemptyset(ign);
	sigemptyset(catch);

	if (p->sig) {
		k = p->sig->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 char * task_sig(struct task_struct *p, char *buffer)
{
	sigset_t ign, catch;

	buffer += sprintf(buffer, "SigPnd:\t");
	buffer = render_sigset_t(&p->pending.signal, buffer);
	*buffer++ = '\n';
	buffer += sprintf(buffer, "SigBlk:\t");
	buffer = render_sigset_t(&p->blocked, buffer);
	*buffer++ = '\n';

	collect_sigign_sigcatch(p, &ign, &catch);
	buffer += sprintf(buffer, "SigIgn:\t");
	buffer = render_sigset_t(&ign, buffer);
	*buffer++ = '\n';
	buffer += sprintf(buffer, "SigCgt:\t"); /* Linux 2.0 uses "SigCgt" */
	buffer = render_sigset_t(&catch, buffer);
	*buffer++ = '\n';

	return buffer;
}

static inline char *task_cap(struct task_struct *p, char *buffer)
{
    return buffer + sprintf(buffer, "CapInh:\t%016x\n"
			    "CapPrm:\t%016x\n"
			    "CapEff:\t%016x\n",
			    cap_t(p->cap_inheritable),
			    cap_t(p->cap_permitted),
			    cap_t(p->cap_effective));
}


int proc_pid_status(struct task_struct *task, char * buffer)
{
	char * orig = buffer;
	struct mm_struct *mm;

	buffer = task_name(task, buffer);
	buffer = task_state(task, buffer);
	task_lock(task);
	mm = task->mm;
	if(mm)
		atomic_inc(&mm->mm_users);
	task_unlock(task);
	if (mm) {
		buffer = task_mem(mm, buffer);
		mmput(mm);
	}
	buffer = task_sig(task, buffer);
	buffer = task_cap(task, buffer);
#if defined(CONFIG_ARCH_S390)
	buffer = task_show_regs(task, buffer);
#endif
	return buffer - orig;
}

int proc_pid_stat(struct task_struct *task, char * buffer)
{
	unsigned long vsize, eip, esp, wchan;
	long priority, nice;
	int tty_pgrp = -1, tty_nr = 0;
	sigset_t sigign, sigcatch;
	char state;
	int res;
	pid_t ppid;
	struct mm_struct *mm;

	state = *get_task_state(task);
	vsize = eip = esp = 0;
	task_lock(task);
	mm = task->mm;
	if(mm)
		atomic_inc(&mm->mm_users);
	if (task->tty) {
		tty_pgrp = task->tty->pgrp;
		tty_nr = kdev_t_to_nr(task->tty->device);
	}
	task_unlock(task);
	if (mm) {
#ifndef NO_MM
		struct vm_area_struct *vma;
#endif
		down_read(&mm->mmap_sem);
#ifndef NO_MM
		vma = mm->mmap;
		while (vma) {
			vsize += vma->vm_end - vma->vm_start;
			vma = vma->vm_next;
		}
#else /* !NO_MM */
		vsize = 0;
		{
			struct mm_tblock_struct *tbp = &mm->tblock;

			while (tbp) {
				if (tbp->rblock)
					vsize += ksize(tbp->rblock->kblock);
				tbp = tbp->next;
			}
		}
#endif /* !NO_MM */
		eip = KSTK_EIP(task);
		esp = KSTK_ESP(task);
		up_read(&mm->mmap_sem);
	}

	wchan = get_wchan(task);

	collect_sigign_sigcatch(task, &sigign, &sigcatch);

	/* scale priority and nice values from timeslices to -20..20 */