/*
* 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>
*/
#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/user.h>
#include <linux/a.out.h>
#include <linux/string.h>
#include <linux/mman.h>
#include <linux/proc_fs.h>
#include <linux/ioport.h>
#include <linux/config.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/swap.h>
#include <asm/segment.h>
#include <asm/pgtable.h>
#include <asm/io.h>
#define LOAD_INT(x) ((x) >> FSHIFT)
#define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
#ifdef CONFIG_DEBUG_MALLOC
int get_malloc(char * buffer);
#endif
static int read_core(struct inode * inode, struct file * file,char * buf, int count)
{
unsigned long p = file->f_pos, memsize;
int read;
int count1;
char * pnt;
struct user dump;
#ifdef __i386__
# define FIRST_MAPPED PAGE_SIZE /* we don't have page 0 mapped on x86.. */
#else
# define FIRST_MAPPED 0
#endif
memset(&dump, 0, sizeof(struct user));
dump.magic = CMAGIC;
dump.u_dsize = MAP_NR(high_memory);
#ifdef __alpha__
dump.start_data = PAGE_OFFSET;
#endif
if (count < 0)
return -EINVAL;
memsize = MAP_NR(high_memory + PAGE_SIZE) << PAGE_SHIFT;
if (p >= memsize)
return 0;
if (count > memsize - p)
count = memsize - p;
read = 0;
if (p < sizeof(struct user) && count > 0) {
count1 = count;
if (p + count1 > sizeof(struct user))
count1 = sizeof(struct user)-p;
pnt = (char *) &dump + p;
memcpy_tofs(buf,(void *) pnt, count1);
buf += count1;
p += count1;
count -= count1;
read += count1;
}
while (count > 0 && p < PAGE_SIZE + FIRST_MAPPED) {
put_user(0,buf);
buf++;
p++;
count--;
read++;
}
memcpy_tofs(buf, (void *) (PAGE_OFFSET + p - PAGE_SIZE), count);
read += count;
file->f_pos += read;
return read;
}
static struct file_operations proc_kcore_operations = {
NULL, /* lseek */
read_core,
};
struct inode_operations proc_kcore_inode_operations = {
&proc_kcore_operations,
};
/*
* This function accesses profiling information. The returned data is
* binary: the sampling step and the actual contents of the profile
* buffer. Use of the program readprofile is recommended in order to
* get meaningful info out of these data.
*/
static int read_profile(struct inode *inode, struct file *file, char *buf, int count)
{
unsigned long p = file->f_pos;
int read;
char * pnt;
unsigned int sample_step = 1 << prof_shift;
if (count < 0)
return -EINVAL;
if (p >= (prof_len+1)*sizeof(unsigned int))
return 0;
if (count > (prof_len+1)*sizeof(unsigned int) - p)
count = (prof_len+1)*sizeof(unsigned int) - p;
read = 0;
while (p < sizeof(unsigned int) && count > 0) {
put_user(*((char *)(&sample_step)+p),buf);
buf++; p++; count--; read++;
}
pnt = (char *)prof_buffer + p - sizeof(unsigned int);
memcpy_tofs(buf,(void *)pnt,count);
read += count;
file->f_pos += read;
return read;
}
/* Writing to /proc/profile resets the counters */
static int write_profile(struct inode * inode, struct file * file, const char * buf, int count)
{
int i=prof_len;
while (i--)
prof_buffer[i]=0UL;
return count;
}
static struct file_operations proc_profile_operations = {
NULL, /* lseek */
read_profile,
write_profile,
};
struct inode_operations proc_profile_inode_operations = {
&proc_profile_operations,
};
static int get_loadavg(char * buffer)
{
int a, b, c;
a = avenrun[0] + (FIXED_1/200);
b = avenrun[1] + (FIXED_1/200);
c = avenrun[2] + (FIXED_1/200);
return sprintf(buffer,"%d.%02d %d.%02d %d.%02d %d/%d %d\n",
LOAD_INT(a), LOAD_FRAC(a),
LOAD_INT(b), LOAD_FRAC(b),
LOAD_INT(c), LOAD_FRAC(c),
nr_running, nr_tasks, last_pid);
}
static int get_kstat(char * buffer)
{
int i, len;
unsigned sum = 0;
extern unsigned long total_forks;
for (i = 0 ; i < NR_IRQS ; i++)
sum += kstat.interrupts[i];
len = sprintf(buffer,
"cpu %u %u %u %lu\n"
"disk %u %u %u %u\n"
"disk_rio %u %u %u %u\n"
"disk_wio %u %u %u %u\n"
"disk_rblk %u %u %u %u\n"
"disk_wblk %u %u %u %u\n"
"page %u %u\n"
"swap %u %u\n"
"intr %u",
kstat.cpu_user,
kstat.cpu_nice,
kstat.cpu_system,
jiffies - (kstat.cpu_user + kstat.cpu_nice + kstat.cpu_system),
kstat.dk_drive[0], kstat.dk_drive[1],
kstat.dk_drive[2], kstat.dk_drive[3],
kstat.dk_drive_rio[0], kstat.dk_drive_rio[1],
kstat.dk_drive_rio[2], kstat.dk_drive_rio[3],
kstat.dk_drive_wio[0], kstat.dk_drive_wio[1],
kstat.dk_drive_wio[2], kstat.dk_drive_wio[3],
kstat.dk_drive_rblk[0], kstat.dk_drive_rblk[1],
kstat.dk_drive_rblk[2], kstat.dk_drive_rblk[3],
kstat.dk_drive_wblk[0], kstat.dk_drive_wblk[1],
kstat.dk_drive_wblk[2], kstat.dk_drive_wblk[3],
kstat.pgpgin,
kstat.pgpgout,
kstat.pswpin,
kstat.pswpout,
sum);
for (i = 0 ; i < NR_IRQS ; i++)
len += sprintf(buffer + len, " %u", kstat.interrupts[i]);
len += sprintf(buffer + len,
"\nctxt %u\n"
"btime %lu\n"
"processes %lu\n",
kstat.context_swtch,
xtime.tv_sec - jiffies / HZ,
total_forks);
return len;
}
static int get_uptime(char * buffer)
{
unsigned long uptime;
unsigned long idle;
uptime = jiffies;
idle = task[0]->utime + task[0]->stime;
/* The formula for the fraction parts really is ((t * 100) / HZ) % 100, but
that would overflow about every five days at HZ == 100.
Therefore the identity a = (a / b) * b + a % b is used so that it is
calculated as (((t / HZ) * 100) + ((t % HZ) * 100) / HZ) % 100.
The part in front of the '+' always evaluates as 0 (mod 100). All divisions
in the above formulas are truncating. For HZ being a power of 10, the
calculations simplify to the version in the #else part (if the printf
format is adapted to the same number of digits as zeroes in HZ.
*/
#if HZ!=100
return sprintf(buffer,"%lu.%02lu %lu.%02lu\n",
uptime / HZ,
(((uptime % HZ) * 100) / HZ) % 100,
idle / HZ,
(((idle % HZ) * 100) / HZ) % 100);
#else
return sprintf(buffer,"%lu.%02lu %lu.%02lu\n",
uptime / HZ,
uptime % HZ,
idle / HZ,
idle % HZ);
#endif
}
static int get_meminfo(char * buffer)
{
struct sysinfo i;
int len;
si_meminfo(&i);
si_swapinfo(&i);
len = sprintf(buffer, " total: used: free: shared: buffers: cached:\n"
"Mem: %8lu %8lu %8lu %8lu %8lu %8lu\n"
"Swap: %8lu %8lu %8lu\n",
i.totalram, i.totalram-i.freeram, i.freeram, i.sharedram, i.bufferram, page_cache_size*PAGE_SIZE,
i.totalswap, i.totalswap-i.freeswap, i.freeswap);
/*
* Tagged format, for easy grepping and expansion. The above will go away
* eventually, once the tools have been updated.
*/
return len + sprintf(buffer+len,
"MemTotal: %8lu kB\n"
"MemFree: %8lu kB\n"
"MemShared: %8lu kB\n"
"Buffers: %8lu kB\n"
"Cached: %8lu kB\n"
"SwapTotal: %8lu kB\n"
"SwapFree: %8lu kB\n",
i.totalram >> 10,
i.freeram >> 10,
i.sharedram >> 10,
i.bufferram >> 10,
page_cache_size << (PAGE_SHIFT - 10),
i.totalswap >> 10,
i.freeswap >> 10);
}
static int get_version(char * buffer)
{
extern char *linux_banner;
strcpy(buffer, linux_banner);
return strlen(buffer);
}
static int get_cmdline(char * buffer)
{
extern char saved_command_line[];
return sprintf(buffer, "%s\n", saved_command_line);
}
static struct task_struct ** get_task(pid_t pid)
{
struct task_struct ** p;
p = task;
while (++p < task+NR_TASKS) {
if (*p && (*p)->pid == pid)
return p;
}
return NULL;
}
static unsigned long get_phys_addr(struct task_struct * p, unsigned long ptr)
{
pgd_t *page_dir;
pmd_t *page_middle;
pte_t pte;
if (!p || !p->mm || ptr >= TASK_SIZE)
return 0;
page_dir = pgd_offset(p->mm,ptr);
if (pgd_none(*page_dir))
return 0;
if (pgd_bad(*page_dir)) {
printk("bad page directory entry %08lx\n", pgd_val(*page_dir));
pgd_clear(page_dir);
return 0;
}
page_middle = pmd_offset(page_dir,ptr);
if (pmd_none(*page_middle))
return 0;
if (pmd_bad(*page_middle)) {
printk("bad page middle entry %08lx\n", pmd_val(*page_middle));
pmd_clear(page_middle);
return 0;
}
pte = *pte_offset(page_middle,ptr);
if (!pte_present(pte))
return 0;
return pte_page(pte) + (ptr & ~PAGE_MASK);
}
static int get_array(struct task_struct ** p, unsigned long start, unsigned long end, char * buffer)
{
unsigned long addr;
int size = 0, result = 0;
char c;
if (start >= end)
return result;
for (;;) {
addr = get_phys_addr(*p, start);
if (!addr)
return result;
do {
c = *(char *) addr;
if (!c)
result = size;
if (size < PAGE_SIZE)
buffer[size++] = c;
else
return result;
addr++;
start++;
if (!c && start >= end)
return result;
} while (addr & ~PAGE_MASK);
}
return result;
}
static int get_env(int pid, char * buffer)
{
struct task_struct ** p = get_task(pid);
if (!p || !*p || !(*p)->mm)
return 0;
return get_array(p, (*p)->mm->env_start, (*p)->mm->env_end, buffer);
}
static int get_arg(int pid, char * buffer)
{
struct task_struct ** p = get_task(pid);
if (!p || !*p || !(*p)->mm)
return 0;
return get_array(p, (*p)->mm->arg_start, (*p)->mm->arg_end, buffer);
}
static unsigned long get_wchan(struct task_struct *p)
{
if (!p || p == current || p->state == TASK_RUNNING)
return 0;
#if defined(__i386__)
{
unsigned long ebp, eip;
unsigned long stack_page;
int count = 0;
stack_page = p->kernel_stack_page;
if (!stack_page)
return 0;
ebp = p->tss.ebp;
do {
if (ebp < stack_page || ebp >= 4092+stack_page)
return 0;
eip = *(unsigned long *) (ebp+4);
if (eip < (unsigned long) interruptible_sleep_on
|| eip >= (unsigned long) add_timer)
return eip;
ebp = *(unsigned long *) ebp;
} while (count++ < 16);
}
#elif defined(__alpha__)
/*
* This one depends on the frame size of schedule(). Do a
* "disass schedule" in gdb to find the frame size. Also, the
* code assumes that sleep_on() follows immediately after
* interruptible_sleep_on() and that add_timer() follows
* immediately after interruptible_sleep(). Ugly, isn't it?
* Maybe adding a wchan field to task_struct would be better,
* after all...
*/
{
unsigned long schedule_frame;
unsigned long pc;
pc = thread_saved_pc(&p->tss);
if (pc >= (unsigned long) interruptible_sleep_on && pc < (unsigned long) add_timer) {
schedule_frame = ((unsigned long *)p->tss.ksp)[6];
return ((unsigned long *)schedule_frame)[12];
}
return pc;
}
#endif
return 0;
}
#if defined(__i386__)
# define KSTK_EIP(tsk) (((unsigned long *)tsk->kernel_stack_page)[1019])
# define KSTK_ESP(tsk) (((unsigned long *)tsk->kernel_stack_page)[1022])
#elif defined(__alpha__)
/*
* See arch/alpha/kernel/ptrace.c for details.
*/
# define PT_REG(reg) (PAGE_SIZE - sizeof(struct pt_regs) \
+ (long)&((struct pt_regs *)0)->reg)
# define KSTK_EIP(tsk) (*(unsigned long *)(tsk->kernel_stack_page + PT_REG(pc)))
# define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->tss.usp)
#elif defined(__sparc__)
# define PT_REG(reg) (PAGE_SIZE - sizeof(struct pt_regs) \
+ (long)&((struct pt_regs *)0)->reg)
# define KSTK_EIP(tsk) (*(unsigned long *)(tsk->kernel_stack_page + PT_REG(pc)))
# define KSTK_ESP(tsk) (*(unsigned long *)(tsk->kernel_stack_page + PT_REG(u_regs[UREG_FP])))
#endif
/* 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;
}
static inline char * task_state(struct task_struct *p, char *buffer)
{
#define NR_STATES (sizeof(states)/sizeof(const char *))
unsigned int n = p->state;
static const char * states[] = {
"R (running)",
"S (sleeping)",
"D (disk sleep)",
"Z (zombie)",
"T (stopped)",
"W (paging)",
". Huh?"
};
if (n >= NR_STATES)
n = NR_STATES-1;
buffer += sprintf(buffer,
"State:\t%s\n"
"Pid:\t%d\n"
"PPid:\t%d\n"
"Uid:\t%d\t%d\t%d\t%d\n"
"Gid:\t%d\t%d\t%d\t%d\n",
states[n],
p->pid, p->p_pptr->pid,
p->uid, p->euid, p->suid, p->fsuid,
p->gid, p->egid, p->sgid, p->fsgid);
return buffer;
}
static inline char * task_mem(struct task_struct *p, char *buffer)
{
struct mm_struct * mm = p->mm;
if (mm && mm != &init_mm) {
struct vm_area_struct * vma = mm->mmap;
unsigned long data = 0, stack = 0;
unsigned long exec = 0, lib = 0;
for (vma = mm->mmap; vma; vma = vma->vm_next) {
unsigned long len = (vma->vm_end - vma->vm_start) >> 10;
if (!vma->vm_inode) {
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);
}
return buffer;
}
static inline char * task_sig(struct task_struct *p, char *buffer)
{
buffer += sprintf(buffer,
"SigPnd:\t%08lx\n"
"SigBlk:\t%08lx\n",
p->signal, p->blocked);
if (p->sig) {
struct sigaction * action = p->sig->action;
unsigned long sig_ign = 0, sig_caught = 0;
unsigned long bit = 1;
int i;
for (i = 0; i < 32; i++) {
switch((unsigned long) action->sa_handler) {
case 0:
break;
case 1:
sig_ign |= bit;
break;
default:
sig_caught |= bit;
}
bit <<= 1;
action++;
}
buffer += sprintf(buffer,
"SigIgn:\t%08lx\n"
"SigCgt:\t%08lx\n",
sig_ign, sig_caught);
}
return buffer;
}
static int get_status(int pid, char * buffer)
{
char * orig = buffer;
struct task_struct ** p = get_task(pid), *tsk;
if (!p || (tsk = *p) == NULL)
return 0;
buffer = task_name(tsk, buffer);
buffer = task_state(tsk, buffer);
buffer = task_mem(tsk, buffer);
buffer = task_sig(tsk, buffer);
return buffer - orig;
}
static int get_stat(int pid, char * buffer)
{
struct task_struct ** p = get_task(pid), *tsk;
unsigned long sigignore=0, sigcatch=0, wchan;
unsigned long vsize, eip, esp;
long priority, nice;
int i,tty_pgrp;
char state;
if (!p || (tsk = *p) == NULL)
return 0;
if (tsk->state < 0 || tsk->state > 5)
state = '.';
else
state = "RSDZTW"[tsk->state];
vsize = eip = esp = 0;
if (tsk->mm && tsk->mm != &init_mm) {
struct vm_area_struct *vma = tsk->mm->mmap;
while (vma) {
vsize += vma->vm_end - vma->vm_start;
vma = vma->vm_next;
}
if (tsk->kernel_stack_page) {
eip = KSTK_EIP(tsk);
esp = KSTK_ESP(tsk);
}
}
wchan = get_wchan(tsk);
if (tsk->sig) {
unsigned long bit = 1;
for(i=0; i<32; ++i) {
switch((unsigned long) tsk->sig->action[i].sa_handler) {
case 0:
break;
case 1:
sigignore |= bit;
break;
default:
sigcatch |= bit;
}
bit <<= 1;
}
}
if (tsk->tty)
tty_pgrp = tsk->tty->pgrp;
else
tty_pgrp = -1;
/* scale priority and nice values from timeslices to -20..20 */
/* to make it look like a "normal" unix priority/nice value */
priority = tsk->counter;
priority = 20 - (priority * 10 + DEF_PRIORITY / 2) / DEF_PRIORITY;
nice = tsk->priority;
nice = 20 - (nice * 20 + DEF_PRIORITY / 2) / DEF_PRIORITY;
return sprintf(buffer,"%d (%s) %c %d %d %d %d %d %lu %lu \
%lu %lu %lu %lu %lu %ld %ld %ld %ld %ld %ld %lu %lu %ld %lu %lu %lu %lu %lu \
%lu %lu %lu %lu %lu %lu %lu %lu\n",
pid,
tsk->comm,
state,
tsk->p_pptr->pid,
tsk->pgrp,
tsk->session,
tsk->tty ? kdev_t_to_nr(tsk->tty->device) : 0,
tty_pgrp,
tsk->flags,
tsk->min_flt,
tsk->cmin_flt,
tsk->maj_flt,
tsk->cmaj_flt,
tsk->utime,
tsk->stime,
tsk->cutime,
tsk->cstime,
priority,
nice,
tsk->timeout,
tsk->it_real_value,
tsk->start_time,
vsize,
tsk->mm ? tsk->mm->rss : 0, /* you might want to shift this left 3 */
tsk->rlim ? tsk->rlim[RLIMIT_RSS].rlim_cur : 0,
tsk->mm ? tsk->mm->start_code : 0,
tsk->mm ? tsk->mm->end_code : 0,
tsk->mm ? tsk->mm->start_stack : 0,
esp,
eip,
tsk->signal,
tsk->blocked,
sigignore,
sigcatch,
wchan,
tsk->nswap,
tsk->cnswap);
}
static inline void statm_pte_range(pmd_t * pmd, unsigned long address, unsigned long size,
int * pages, int * shared, int * dirty, int * total)
{
pte_t * pte;
unsigned long end;
if (pmd_none(*pmd))
return;
if (pmd_bad(*pmd)) {
printk("statm_pte_range: bad pmd (%08lx)\n", pmd_val(*pmd));
pmd_clear(pmd);
return;
}
pte = pte_offset(pmd, address);
address &= ~PMD_MASK;
end = address + size;
if (end > PMD_SIZE)
end = PMD_SIZE;
do {
pte_t page = *pte;
address += PAGE_SIZE;
pte++;
if (pte_none(page))
continue;
++*total;
if (!pte_present(page))
continue;
++*pages;
if (pte_dirty(page))
++*dirty;
if (pte_page(page) >= high_memory)
continue;
if (mem_map[MAP_NR(pte_page(page))].count > 1)
++*shared;
} while (address < end);
}
static inline void statm_pmd_range(pgd_t * pgd, unsigned long address, unsigned long size,
int * pages, int * shared, int * dirty, int * total)
{
pmd_t * pmd;
unsigned long end;
if (pgd_none(*pgd))
return;
if (pgd_bad(*pgd)) {
printk("statm_pmd_range: bad pgd (%08lx)\n", pgd_val(*pgd));
pgd_clear(pgd);
return;
}
pmd = pmd_offset(pgd, address);
address &= ~PGDIR_MASK;
end = address + size;
if (end > PGDIR_SIZE)
end = PGDIR_SIZE;
do {
statm_pte_range(pmd, address, end - address, pages, shared, dirty, total);
address = (address + PMD_SIZE) & PMD_MASK;
pmd++;
} while (address < end);
}
static void statm_pgd_range(pgd_t * pgd, unsigned long address, unsigned long end,
int * pages, int * shared, int * dirty, int * total)
{
while (address < end) {
statm_pmd_range(pgd, address, end - address, pages, shared, dirty, total);
address = (address + PGDIR_SIZE) & PGDIR_MASK;
pgd++;
}
}
static int get_statm(int pid, char * buffer)
{
struct task_struct ** p = get_task(pid), *tsk;
int size=0, resident=0, share=0, trs=0, lrs=0, drs=0, dt=0;
if (!p || (tsk = *p) == NULL)
return 0;
if (tsk->mm && tsk->mm != &init_mm) {
struct vm_area_struct * vma = tsk->mm->mmap;
while (vma) {
pgd_t *pgd = pgd_offset(tsk->mm, vma->vm_start);
int pages = 0, shared = 0, dirty = 0, total = 0;
statm_pgd_range(pgd, vma->vm_start, vma->vm_end, &pages, &shared, &dirty, &total);
resident += pages;
share += shared;
dt += dirty;
size += total;
if (vma->vm_flags & VM_EXECUTABLE)
trs += pages; /* text */
else if (vma->vm_flags & VM_GROWSDOWN)
drs += pages; /* stack */
else if (vma->vm_end > 0x60000000)
lrs += pages; /* library */
else
drs += pages;
vma = vma->vm_next;
}
}
return sprintf(buffer,"%d %d %d %d %d %d %d\n",
size, resident, share, trs, lrs, drs, dt);
}
/*
* The way we support synthetic files > 4K
* - without storing their contents in some buffer and
* - without walking through the entire synthetic file until we reach the
* position of the requested data
* is to cleverly encode the current position in the file's f_pos field.
* There is no requirement that a read() call which returns `count' bytes
* of data increases f_pos by exactly `count'.
*
* This idea is Linus' one. Bruno implemented it.
*/
/*
* For the /proc/<pid>/maps file, we use fixed length records, each containing
* a single line.
*/
#define MAPS_LINE_LENGTH 1024
#define MAPS_LINE_SHIFT 10
/*
* f_pos = (number of the vma in the task->mm->mmap list) * MAPS_LINE_LENGTH
* + (index into the line)
*/
/* for systems with sizeof(void*) == 4: */
#define MAPS_LINE_FORMAT4 "%08lx-%08lx %s %08lx %s %lu\n"
#define MAPS_LINE_MAX4 49 /* sum of 8 1 8 1 4 1 8 1 5 1 10 1 */
/* for systems with sizeof(void*) == 8: */
#define MAPS_LINE_FORMAT8 "%016lx-%016lx %s %016lx %s %lu\n"
#define MAPS_LINE_MAX8 73 /* sum of 16 1 16 1 4 1 16 1 5 1 10 1 */
#define MAPS_LINE_MAX MAPS_LINE_MAX8
static int read_maps (int pid, struct file * file, char * buf, int count)
{
struct task_struct ** p = get_task(pid);
char * destptr;
loff_t lineno;
int column;
struct vm_area_struct * map;
int i;
if (!p || !*p)
return -EINVAL;
if (!(*p)->mm || (*p)->mm == &init_mm || count == 0)
return 0;
/* decode f_pos */
lineno = file->f_pos >> MAPS_LINE_SHIFT;
column = file->f_pos & (MAPS_LINE_LENGTH-1);
/* quickly go to line lineno */
for (map = (*p)->mm->mmap, i = 0; map && (i < lineno); map = map->vm_next, i++)
continue;
destptr = buf;
for ( ; map ; ) {
/* produce the next line */
char line[MAPS_LINE_MAX+1];
char str[5], *cp = str;
int flags;
kdev_t dev;
unsigned long ino;
int len;
flags = map->vm_flags;
*cp++ = flags & VM_READ ? 'r' : '-';
*cp++ = flags & VM_WRITE ? 'w' : '-';
*cp++ = flags & VM_EXEC ? 'x' : '-';
*cp++ = flags & VM_MAYSHARE ? 's' : 'p';
*cp++ = 0;
if (map->vm_inode != NULL) {
dev = map->vm_inode->i_dev;
ino = map->vm_inode->i_ino;
} else {
dev = 0;
ino = 0;
}
len = sprintf(line,
sizeof(void*) == 4 ? MAPS_LINE_FORMAT4 : MAPS_LINE_FORMAT8,
map->vm_start, map->vm_end, str, map->vm_offset,
kdevname(dev), ino);
if (column >= len) {
column = 0; /* continue with next line at column 0 */
lineno++;
map = map->vm_next;
continue;
}
i = len-column;
if (i > count)
i = count;
memcpy_tofs(destptr, line+column, i);
destptr += i; count -= i;
column += i;
if (column >= len) {
column = 0; /* next time: next line at column 0 */
lineno++;
map = map->vm_next;
}
/* done? */
if (count == 0)
break;
/* By writing to user space, we might have slept.
* Stop the loop, to avoid a race condition.
*/
if (*p != current)
break;
}
/* encode f_pos */
file->f_pos = (lineno << MAPS_LINE_SHIFT) + column;
return destptr-buf;
}
#ifdef CONFIG_MODULES
extern int get_module_list(char *);
extern int get_ksyms_list(char *, char **, off_t, int);
#endif
extern int get_device_list(char *);
extern int get_filesystem_list(char *);
extern int get_filesystem_info( char * );
extern int get_irq_list(char *);
extern int get_dma_list(char *);
extern int get_cpuinfo(char *);
extern int get_pci_list(char*);
extern int get_md_status (char *);
extern int get_rtc_status (char *);
extern int get_locks_status (char *);
#ifdef __SMP_PROF__
extern int get_smp_prof_list(char *);
#endif
static int get_root_array(char * page, int type, char **start, off_t offset, int length)
{
switch (type) {
case PROC_LOADAVG:
return get_loadavg(page);
case PROC_UPTIME:
return get_uptime(page);
case PROC_MEMINFO:
return get_meminfo(page);
#ifdef CONFIG_PCI
case PROC_PCI:
return get_pci_list(page);
#endif
case PROC_CPUINFO:
return get_cpuinfo(page);
case PROC_VERSION:
return get_version(page);
#ifdef CONFIG_DEBUG_MALLOC
case PROC_MALLOC:
return get_malloc(page);
#endif
#ifdef CONFIG_MODULES
case PROC_MODULES:
return get_module_list(page);
case PROC_KSYMS:
return get_ksyms_list(page, start, offset, length);
#endif
case PROC_STAT:
return get_kstat(page);
case PROC_DEVICES:
return get_device_list(page);
case PROC_INTERRUPTS:
return get_irq_list(page);
case PROC_FILESYSTEMS:
return get_filesystem_list(page);
case PROC_DMA:
return get_dma_list(page);
case PROC_IOPORTS:
return get_ioport_list(page);
#ifdef CONFIG_BLK_DEV_MD
case PROC_MD:
return get_md_status(page);
#endif
#ifdef __SMP_PROF__
case PROC_SMP_PROF:
return get_smp_prof_list(page);
#endif
case PROC_CMDLINE:
return get_cmdline(page);
case PROC_MTAB:
return get_filesystem_info( page );
#ifdef CONFIG_RTC
case PROC_RTC:
return get_rtc_status(page);
#endif
case PROC_LOCKS:
return get_locks_status(page);
}
return -EBADF;
}
static int get_process_array(char * page, int pid, int type)
{
switch (type) {
case PROC_PID_STATUS:
return get_status(pid, page);
case PROC_PID_ENVIRON:
return get_env(pid, page);
case PROC_PID_CMDLINE:
return get_arg(pid, page);
case PROC_PID_STAT:
return get_stat(pid, page);
case PROC_PID_STATM:
return get_statm(pid, page);
}
return -EBADF;
}
static inline int fill_array(char * page, int pid, int type, char **start, off_t offset, int length)
{
if (pid)
return get_process_array(page, pid, type);
return get_root_array(page, type, start, offset, length);
}
#define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
static int array_read(struct inode * inode, struct file * file,char * buf, int count)
{
unsigned long page;
char *start;
int length;
int end;
unsigned int type, pid;
struct proc_dir_entry *dp;
if (count < 0)
return -EINVAL;
if (count > PROC_BLOCK_SIZE)
count = PROC_BLOCK_SIZE;
if (!(page = __get_free_page(GFP_KERNEL)))
return -ENOMEM;
type = inode->i_ino;
pid = type >> 16;
type &= 0x0000ffff;
start = NULL;
dp = (struct proc_dir_entry *) inode->u.generic_ip;
if (dp->get_info)
length = dp->get_info((char *)page, &start, file->f_pos,
count, 0);
else
length = fill_array((char *) page, pid, type,
&start, file->f_pos, count);
if (length < 0) {
free_page(page);
return length;
}
if (start != NULL) {
/* We have had block-adjusting processing! */
memcpy_tofs(buf, start, length);
file->f_pos += length;
count = length;
} else {
/* Static 4kB (or whatever) block capacity */
if (file->f_pos >= length) {
free_page(page);
return 0;
}
if (count + file->f_pos > length)
count = length - file->f_pos;
end = count + file->f_pos;
memcpy_tofs(buf, (char *) page + file->f_pos, count);
file->f_pos = end;
}
free_page(page);
return count;
}
static struct file_operations proc_array_operations = {
NULL, /* array_lseek */
array_read,
NULL, /* array_write */
NULL, /* array_readdir */
NULL, /* array_select */
NULL, /* array_ioctl */
NULL, /* mmap */
NULL, /* no special open code */
NULL, /* no special release code */
NULL /* can't fsync */
};
struct inode_operations proc_array_inode_operations = {
&proc_array_operations, /* default base directory file-ops */
NULL, /* create */
NULL, /* lookup */
NULL, /* link */
NULL, /* unlink */
NULL, /* symlink */
NULL, /* mkdir */
NULL, /* rmdir */
NULL, /* mknod */
NULL, /* rename */
NULL, /* readlink */
NULL, /* follow_link */
NULL, /* readpage */
NULL, /* writepage */
NULL, /* bmap */
NULL, /* truncate */
NULL /* permission */
};
static int arraylong_read (struct inode * inode, struct file * file, char * buf, int count)
{
unsigned int pid = inode->i_ino >> 16;
unsigned int type = inode->i_ino & 0x0000ffff;
if (count < 0)
return -EINVAL;
switch (type) {
case PROC_PID_MAPS:
return read_maps(pid, file, buf, count);
}
return -EINVAL;
}
static struct file_operations proc_arraylong_operations = {
NULL, /* array_lseek */
arraylong_read,
NULL, /* array_write */
NULL, /* array_readdir */
NULL, /* array_select */
NULL, /* array_ioctl */
NULL, /* mmap */
NULL, /* no special open code */
NULL, /* no special release code */
NULL /* can't fsync */
};
struct inode_operations proc_arraylong_inode_operations = {
&proc_arraylong_operations, /* default base directory file-ops */
NULL, /* create */
NULL, /* lookup */
NULL, /* link */
NULL, /* unlink */
NULL, /* symlink */
NULL, /* mkdir */
NULL, /* rmdir */
NULL, /* mknod */
NULL, /* rename */
NULL, /* readlink */
NULL, /* follow_link */
NULL, /* readpage */
NULL, /* writepage */
NULL, /* bmap */
NULL, /* truncate */
NULL /* permission */
};