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libc/winsup/cygwin/fhandler_proc.cc

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/* fhandler_proc.cc: fhandler for /proc virtual filesystem
Copyright 2002 Red Hat, Inc.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/cygwin.h>
#include <ntdef.h>
#include "cygerrno.h"
#include "security.h"
#include "fhandler.h"
#include "path.h"
#include "pinfo.h"
#include "dtable.h"
#include "cygheap.h"
#include <assert.h>
#include <sys/utsname.h>
#include <sys/param.h>
#include "ntdll.h"
#define _COMPILING_NEWLIB
#include <dirent.h>
/* offsets in proc_listing */
static const int PROC_LOADAVG = 2; // /proc/loadavg
static const int PROC_MEMINFO = 3; // /proc/meminfo
static const int PROC_REGISTRY = 4; // /proc/registry
static const int PROC_STAT = 5; // /proc/stat
static const int PROC_VERSION = 6; // /proc/version
static const int PROC_UPTIME = 7; // /proc/uptime
/* names of objects in /proc */
static const char *proc_listing[] = {
".",
"..",
"loadavg",
"meminfo",
"registry",
"stat",
"version",
"uptime",
NULL
};
static const int PROC_LINK_COUNT = (sizeof (proc_listing) / sizeof (const char *)) - 1;
/* FH_PROC in the table below means the file/directory is handles by
* fhandler_proc.
*/
static const DWORD proc_fhandlers[PROC_LINK_COUNT] = {
FH_PROC,
FH_PROC,
FH_PROC,
FH_PROC,
FH_REGISTRY,
FH_PROC,
FH_PROC,
FH_PROC
};
/* name of the /proc filesystem */
const char proc[] = "/proc";
const int proc_len = sizeof (proc) - 1;
static off_t format_proc_meminfo (char *destbuf, size_t maxsize);
static off_t format_proc_stat (char *destbuf, size_t maxsize);
static off_t format_proc_uptime (char *destbuf, size_t maxsize);
/* auxillary function that returns the fhandler associated with the given path
* this is where it would be nice to have pattern matching in C - polymorphism
* just doesn't cut it
*/
DWORD
fhandler_proc::get_proc_fhandler (const char *path)
{
debug_printf ("get_proc_fhandler(%s)", path);
path += proc_len;
/* Since this method is called from path_conv::check we can't rely on
* it being normalised and therefore the path may have runs of slashes
* in it.
*/
while (SLASH_P (*path))
path++;
/* Check if this is the root of the virtual filesystem (i.e. /proc). */
if (*path == 0)
return FH_PROC;
for (int i = 0; proc_listing[i]; i++)
{
if (path_prefix_p (proc_listing[i], path, strlen (proc_listing[i])))
return proc_fhandlers[i];
}
if (pinfo (atoi (path)))
return FH_PROCESS;
bool has_subdir = false;
while (*path)
if (SLASH_P (*path++))
{
has_subdir = true;
break;
}
if (has_subdir)
/* The user is trying to access a non-existent subdirectory of /proc. */
return FH_BAD;
else
/* Return FH_PROC so that we can return EROFS if the user is trying to create
a file. */
return FH_PROC;
}
/* Returns 0 if path doesn't exist, >0 if path is a directory,
* <0 if path is a file.
*/
int
fhandler_proc::exists ()
{
const char *path = get_name ();
debug_printf ("exists (%s)", path);
path += proc_len;
if (*path == 0)
return 2;
for (int i = 0; proc_listing[i]; i++)
if (pathmatch (path + 1, proc_listing[i]))
return (proc_fhandlers[i] == FH_PROC) ? -1 : 1;
return 0;
}
fhandler_proc::fhandler_proc ():
fhandler_virtual (FH_PROC)
{
}
fhandler_proc::fhandler_proc (DWORD devtype):
fhandler_virtual (devtype)
{
}
int
fhandler_proc::fstat (struct __stat64 *buf, path_conv *pc)
{
const char *path = get_name ();
debug_printf ("fstat (%s)", path);
path += proc_len;
(void) fhandler_base::fstat (buf, pc);
buf->st_mode &= ~_IFMT & NO_W;
if (!*path)
{
buf->st_nlink = PROC_LINK_COUNT;
buf->st_mode |= S_IFDIR | S_IXUSR | S_IXGRP | S_IXOTH;
return 0;
}
else
{
path++;
for (int i = 0; proc_listing[i]; i++)
if (pathmatch (path, proc_listing[i]))
{
if (proc_fhandlers[i] != FH_PROC)
buf->st_mode |= S_IFDIR | S_IXUSR | S_IXGRP | S_IXOTH;
else
{
buf->st_mode &= NO_X;
buf->st_mode |= S_IFREG;
}
return 0;
}
}
set_errno (ENOENT);
return -1;
}
struct dirent *
fhandler_proc::readdir (DIR * dir)
{
if (dir->__d_position >= PROC_LINK_COUNT)
{
winpids pids;
int found = 0;
for (unsigned i = 0; i < pids.npids; i++)
if (found++ == dir->__d_position - PROC_LINK_COUNT)
{
__small_sprintf (dir->__d_dirent->d_name, "%d", pids[i]->pid);
dir->__d_position++;
return dir->__d_dirent;
}
set_errno (ENMFILE);
return NULL;
}
strcpy (dir->__d_dirent->d_name, proc_listing[dir->__d_position++]);
syscall_printf ("%p = readdir (%p) (%s)", &dir->__d_dirent, dir,
dir->__d_dirent->d_name);
return dir->__d_dirent;
}
int
fhandler_proc::open (path_conv *pc, int flags, mode_t mode)
{
int proc_file_no = -1;
int res = fhandler_virtual::open (pc, flags, mode);
if (!res)
goto out;
set_nohandle (true);
const char *path;
path = get_name () + proc_len;
if (!*path)
{
if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
{
set_errno (EEXIST);
res = 0;
goto out;
}
else if (flags & O_WRONLY)
{
set_errno (EISDIR);
res = 0;
goto out;
}
else
{
flags |= O_DIROPEN;
goto success;
}
}
proc_file_no = -1;
for (int i = 0; proc_listing[i]; i++)
if (path_prefix_p (proc_listing[i], path + 1, strlen (proc_listing[i])))
{
proc_file_no = i;
if (proc_fhandlers[i] != FH_PROC)
{
if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
{
set_errno (EEXIST);
res = 0;
goto out;
}
else if (flags & O_WRONLY)
{
set_errno (EISDIR);
res = 0;
goto out;
}
else
{
flags |= O_DIROPEN;
goto success;
}
}
}
if (proc_file_no == -1)
{
if (flags & O_CREAT)
{
set_errno (EROFS);
res = 0;
goto out;
}
else
{
set_errno (ENOENT);
res = 0;
goto out;
}
}
if (flags & O_WRONLY)
{
set_errno (EROFS);
res = 0;
goto out;
}
fileid = proc_file_no;
if (!fill_filebuf ())
{
res = 0;
goto out;
}
if (flags & O_APPEND)
position = filesize;
else
position = 0;
success:
res = 1;
set_flags ((flags & ~O_TEXT) | O_BINARY);
set_open_status ();
out:
syscall_printf ("%d = fhandler_proc::open (%p, %d)", res, flags, mode);
return res;
}
bool
fhandler_proc::fill_filebuf ()
{
switch (fileid)
{
case PROC_VERSION:
{
if (!filebuf)
{
struct utsname uts_name;
uname (&uts_name);
bufalloc = strlen (uts_name.sysname) + 1 + strlen (uts_name.release) +
1 + strlen (uts_name.version) + 2;
filebuf = (char *) cmalloc (HEAP_BUF, bufalloc);
filesize = __small_sprintf (filebuf, "%s %s %s\n", uts_name.sysname,
uts_name.release, uts_name.version);
}
break;
}
case PROC_UPTIME:
{
if (!filebuf)
filebuf = (char *) cmalloc (HEAP_BUF, bufalloc = 80);
filesize = format_proc_uptime (filebuf, bufalloc);
break;
}
case PROC_STAT:
{
if (!filebuf)
filebuf = (char *) cmalloc (HEAP_BUF, bufalloc = 2048);
filesize = format_proc_stat (filebuf, bufalloc);
break;
}
case PROC_LOADAVG:
{
/*
* not really supported - Windows doesn't keep track of these values
* Windows 95/98/me does have the KERNEL/CPUUsage performance counter
* which is similar.
*/
if (!filebuf)
filebuf = (char *) cmalloc (HEAP_BUF, bufalloc = 16);
filesize = __small_sprintf (filebuf, "%u.%02u %u.%02u %u.%02u\n",
0, 0, 0, 0, 0, 0);
break;
}
case PROC_MEMINFO:
{
if (!filebuf)
filebuf = (char *) cmalloc (HEAP_BUF, bufalloc = 2048);
filesize = format_proc_meminfo (filebuf, bufalloc);
break;
}
}
return true;
}
static
off_t
format_proc_meminfo (char *destbuf, size_t maxsize)
{
unsigned long mem_total = 0UL, mem_free = 0UL, swap_total = 0UL,
swap_free = 0UL;
MEMORYSTATUS memory_status;
GlobalMemoryStatus (&memory_status);
mem_total = memory_status.dwTotalPhys;
mem_free = memory_status.dwAvailPhys;
swap_total = memory_status.dwTotalPageFile;
swap_free = memory_status.dwAvailPageFile;
return __small_sprintf (destbuf, " total: used: free:\n"
"Mem: %10lu %10lu %10lu\n"
"Swap: %10lu %10lu %10lu\n"
"MemTotal: %10lu kB\n"
"MemFree: %10lu kB\n"
"MemShared: 0 kB\n"
"HighTotal: 0 kB\n"
"HighFree: 0 kB\n"
"LowTotal: %10lu kB\n"
"LowFree: %10lu kB\n"
"SwapTotal: %10lu kB\n"
"SwapFree: %10lu kB\n",
mem_total, mem_total - mem_free, mem_free,
swap_total, swap_total - swap_free, swap_free,
mem_total >> 10, mem_free >> 10,
mem_total >> 10, mem_free >> 10,
swap_total >> 10, swap_free >> 10);
}
static
off_t
format_proc_uptime (char *destbuf, size_t maxsize)
{
unsigned long long uptime = 0ULL, idle_time = 0ULL;
SYSTEM_PROCESSOR_TIMES spt;
NTSTATUS ret = NtQuerySystemInformation (SystemProcessorTimes, (PVOID) &spt,
sizeof spt, NULL);
if (!ret && GetLastError () == ERROR_PROC_NOT_FOUND)
uptime = GetTickCount () / 10;
else if (ret != STATUS_SUCCESS)
{
__seterrno_from_win_error (RtlNtStatusToDosError (ret));
debug_printf("NtQuerySystemInformation: ret = %d, "
"Dos(ret) = %d",
ret, RtlNtStatusToDosError (ret));
return 0;
}
else
{
idle_time = spt.IdleTime.QuadPart / 100000ULL;
uptime = (spt.KernelTime.QuadPart +
spt.UserTime.QuadPart) / 100000ULL;
}
return __small_sprintf (destbuf, "%U.%02u %U.%02u\n",
uptime / 100, long (uptime % 100),
idle_time / 100, long (idle_time % 100));
}
static
off_t
format_proc_stat (char *destbuf, size_t maxsize)
{
unsigned long long user_time = 0ULL, kernel_time = 0ULL, idle_time = 0ULL;
unsigned long pages_in = 0UL, pages_out = 0UL, interrupt_count = 0UL,
context_switches = 0UL, swap_in = 0UL, swap_out = 0UL;
time_t boot_time = 0;
if (wincap.is_winnt ())
{
NTSTATUS ret;
SYSTEM_PROCESSOR_TIMES spt;
SYSTEM_PERFORMANCE_INFORMATION spi;
SYSTEM_TIME_OF_DAY_INFORMATION stodi;
ret = NtQuerySystemInformation (SystemProcessorTimes,
(PVOID) &spt,
sizeof spt, NULL);
if (ret == STATUS_SUCCESS)
ret = NtQuerySystemInformation (SystemPerformanceInformation,
(PVOID) &spi,
sizeof spi, NULL);
if (ret == STATUS_SUCCESS)
ret = NtQuerySystemInformation (SystemTimeOfDayInformation,
(PVOID) &stodi,
sizeof stodi, NULL);
if (ret != STATUS_SUCCESS)
{
__seterrno_from_win_error (RtlNtStatusToDosError (ret));
debug_printf("NtQuerySystemInformation: ret = %d, "
"Dos(ret) = %d",
ret, RtlNtStatusToDosError (ret));
return 0;
}
kernel_time = (spt.KernelTime.QuadPart - spt.IdleTime.QuadPart) * HZ / 10000000ULL;
user_time = spt.UserTime.QuadPart * HZ / 10000000ULL;
idle_time = spt.IdleTime.QuadPart * HZ / 10000000ULL;
interrupt_count = spt.InterruptCount;
pages_in = spi.PagesRead;
pages_out = spi.PagefilePagesWritten + spi.MappedFilePagesWritten;
/*
* Note: there is no distinction made in this structure between pages
* read from the page file and pages read from mapped files, but there
* is such a distinction made when it comes to writing. Goodness knows
* why. The value of swap_in, then, will obviously be wrong but its our
* best guess.
*/
swap_in = spi.PagesRead;
swap_out = spi.PagefilePagesWritten;
context_switches = spi.ContextSwitches;
boot_time = to_time_t ((FILETIME *) &stodi.BootTime.QuadPart);
}
/*
* else
* {
* There are only two relevant performance counters on Windows 95/98/me,
* VMM/cPageIns and VMM/cPageOuts. The extra effort needed to read these
* counters is by no means worth it.
* }
*/
return __small_sprintf (destbuf, "cpu %U %U %U %U\n"
"page %u %u\n"
"swap %u %u\n"
"intr %u\n"
"ctxt %u\n"
"btime %u\n",
user_time, 0ULL,
kernel_time, idle_time,
pages_in, pages_out,
swap_in, swap_out,
interrupt_count,
context_switches,
boot_time);
}
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