newlib-cygwin/winsup/cygwin/fhandler_procsysvipc.cc

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/* fhandler_procsysvipc.cc: fhandler for /proc/sysvipc virtual filesystem
Copyright 2011 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 <stdlib.h>
#include <stdio.h>
#include <sys/cygwin.h>
#include "cygerrno.h"
#include "cygserver.h"
#include "security.h"
#include "path.h"
#include "fhandler.h"
#include "fhandler_virtual.h"
#include "pinfo.h"
#include "shared_info.h"
#include "dtable.h"
#include "cygheap.h"
#include "ntdll.h"
#include "cygtls.h"
#include "pwdgrp.h"
#include "tls_pbuf.h"
#include <sys/param.h>
#include <ctype.h>
#define _COMPILING_NEWLIB
#include <dirent.h>
#define _KERNEL
#include <sys/ipc.h>
#include <sys/msg.h>
#include <sys/sem.h>
#include <sys/shm.h>
static _off64_t format_procsysvipc_msg (void *, char *&);
static _off64_t format_procsysvipc_sem (void *, char *&);
static _off64_t format_procsysvipc_shm (void *, char *&);
static const virt_tab_t procsysvipc_tab[] =
{
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{ _VN ("."), FH_PROCSYSVIPC, virt_directory, NULL },
{ _VN (".."), FH_PROCSYSVIPC, virt_directory, NULL },
{ _VN ("msg"), FH_PROCSYSVIPC, virt_file, format_procsysvipc_msg },
{ _VN ("sem"), FH_PROCSYSVIPC, virt_file, format_procsysvipc_sem },
{ _VN ("shm"), FH_PROCSYSVIPC, virt_file, format_procsysvipc_shm },
{ NULL, 0, FH_NADA, virt_none, NULL }
};
static const int PROCSYSVIPC_LINK_COUNT =
(sizeof (procsysvipc_tab) / sizeof (virt_tab_t)) - 1;
/* Returns 0 if path doesn't exist, >0 if path is a directory,
* -1 if path is a file.
*/
virtual_ftype_t
fhandler_procsysvipc::exists ()
{
const char *path = get_name ();
debug_printf ("exists (%s)", path);
path += proc_len + 1;
while (*path != 0 && !isdirsep (*path))
path++;
if (*path == 0)
return virt_rootdir;
virt_tab_t *entry = virt_tab_search (path + 1, true, procsysvipc_tab,
PROCSYSVIPC_LINK_COUNT);
cygserver_init();
if (entry)
{
if (entry->type == virt_file)
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{
if (cygserver_running != CYGSERVER_OK)
return virt_none;
}
fileid = entry - procsysvipc_tab;
return entry->type;
}
return virt_none;
}
fhandler_procsysvipc::fhandler_procsysvipc ():
fhandler_proc ()
{
}
int
fhandler_procsysvipc::fstat (struct __stat64 *buf)
{
fhandler_base::fstat (buf);
buf->st_mode &= ~_IFMT & NO_W;
int file_type = exists ();
switch (file_type)
{
case virt_none:
set_errno (ENOENT);
return -1;
case virt_directory:
case virt_rootdir:
buf->st_mode |= S_IFDIR | S_IXUSR | S_IXGRP | S_IXOTH;
buf->st_nlink = 2;
return 0;
case virt_file:
default:
buf->st_mode |= S_IFREG | S_IRUSR | S_IRGRP | S_IROTH;
return 0;
}
}
int
fhandler_procsysvipc::readdir (DIR *dir, dirent *de)
{
int res = ENMFILE;
if (dir->__d_position >= PROCSYSVIPC_LINK_COUNT)
goto out;
{
cygserver_init();
if (cygserver_running != CYGSERVER_OK)
goto out;
}
strcpy (de->d_name, procsysvipc_tab[dir->__d_position++].name);
dir->__flags |= dirent_saw_dot | dirent_saw_dot_dot;
res = 0;
out:
syscall_printf ("%d = readdir (%p, %p) (%s)", res, dir, de, de->d_name);
return res;
}
int
fhandler_procsysvipc::open (int flags, mode_t mode)
{
int res = fhandler_virtual::open (flags, mode);
if (!res)
goto out;
nohandle (true);
const char *path;
path = get_name () + proc_len + 1;
pid = atoi (path);
while (*path != 0 && !isdirsep (*path))
path++;
if (*path == 0)
{
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;
}
}
virt_tab_t *entry;
entry = virt_tab_search (path + 1, true, procsysvipc_tab, PROCSYSVIPC_LINK_COUNT);
if (!entry)
{
set_errno ((flags & O_CREAT) ? EROFS : ENOENT);
res = 0;
goto out;
}
if (flags & O_WRONLY)
{
set_errno (EROFS);
res = 0;
goto out;
}
fileid = entry - procsysvipc_tab;
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_procsysvipc::fill_filebuf ()
{
if (procsysvipc_tab[fileid].format_func)
{
filesize = procsysvipc_tab[fileid].format_func (NULL, filebuf);
return true;
}
return false;
}
static _off64_t
format_procsysvipc_msg (void *, char *&destbuf)
{
tmp_pathbuf tp;
char *buf = tp.c_get ();
char *bufptr = buf;
struct msginfo msginfo;
struct msqid_ds *xmsqids;
size_t xmsqids_len;
msgctl (0, IPC_INFO, (struct msqid_ds *) &msginfo);
xmsqids_len = sizeof (struct msqid_ds) * msginfo.msgmni;
xmsqids = (struct msqid_ds *) malloc (xmsqids_len);
msgctl (msginfo.msgmni, IPC_INFO, (struct msqid_ds *) xmsqids);
bufptr += __small_sprintf (bufptr,
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" key msqid perms cbytes qnum lspid lrpid uid gid cuid cgid stime rtime ctime\n");
for (int i = 0; i < msginfo.msgmni; i++) {
if (xmsqids[i].msg_qbytes != 0) {
bufptr += sprintf (bufptr,
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"%10llu %10u %5o %11lu %10lu %5d %5d %5lu %5lu %5lu %5lu %10ld %10ld %10ld\n",
xmsqids[i].msg_perm.key,
IXSEQ_TO_IPCID(i, xmsqids[i].msg_perm),
xmsqids[i].msg_perm.mode,
xmsqids[i].msg_cbytes,
xmsqids[i].msg_qnum,
xmsqids[i].msg_lspid,
xmsqids[i].msg_lrpid,
xmsqids[i].msg_perm.uid,
xmsqids[i].msg_perm.gid,
xmsqids[i].msg_perm.cuid,
xmsqids[i].msg_perm.cgid,
xmsqids[i].msg_stime,
xmsqids[i].msg_rtime,
xmsqids[i].msg_ctime);
}
}
destbuf = (char *) crealloc_abort (destbuf, bufptr - buf);
memcpy (destbuf, buf, bufptr - buf);
return bufptr - buf;
}
static _off64_t
format_procsysvipc_sem (void *, char *&destbuf)
{
tmp_pathbuf tp;
char *buf = tp.c_get ();
char *bufptr = buf;
union semun semun;
struct seminfo seminfo;
struct semid_ds *xsemids;
size_t xsemids_len;
semun.buf = (struct semid_ds *) &seminfo;
semctl (0, 0, IPC_INFO, semun);
xsemids_len = sizeof (struct semid_ds) * seminfo.semmni;
xsemids = (struct semid_ds *) malloc (xsemids_len);
semun.buf = xsemids;
semctl (seminfo.semmni, 0, IPC_INFO, semun);
bufptr += __small_sprintf (bufptr,
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" key semid perms nsems uid gid cuid cgid otime ctime\n");
for (int i = 0; i < seminfo.semmni; i++) {
if ((xsemids[i].sem_perm.mode & SEM_ALLOC) != 0) {
bufptr += sprintf (bufptr,
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"%10llu %10u %5o %10d %5lu %5lu %5lu %5lu %10ld %10ld\n",
xsemids[i].sem_perm.key,
IXSEQ_TO_IPCID(i, xsemids[i].sem_perm),
xsemids[i].sem_perm.mode,
xsemids[i].sem_nsems,
xsemids[i].sem_perm.uid,
xsemids[i].sem_perm.gid,
xsemids[i].sem_perm.cuid,
xsemids[i].sem_perm.cgid,
xsemids[i].sem_otime,
xsemids[i].sem_ctime);
}
}
destbuf = (char *) crealloc_abort (destbuf, bufptr - buf);
memcpy (destbuf, buf, bufptr - buf);
return bufptr - buf;
}
static _off64_t
format_procsysvipc_shm (void *, char *&destbuf)
{
tmp_pathbuf tp;
char *buf = tp.c_get ();
char *bufptr = buf;
struct shminfo shminfo;
struct shmid_ds *xshmids;
size_t xshmids_len;
shmctl (0, IPC_INFO, (struct shmid_ds *) &shminfo);
xshmids_len = sizeof (struct shmid_ds) * shminfo.shmmni;
xshmids = (struct shmid_ds *) malloc (xshmids_len);
shmctl (shminfo.shmmni, IPC_INFO, (struct shmid_ds *) xshmids);
bufptr += __small_sprintf (bufptr,
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" key shmid perms size cpid lpid nattch uid gid cuid cgid atime dtime ctime\n");
for (int i = 0; i < shminfo.shmmni; i++) {
if (xshmids[i].shm_perm.mode & 0x0800) {
bufptr += sprintf (bufptr,
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"%10llu %10u %5o %10u %5d %5d %6u %5lu %5lu %5lu %5lu %10ld %10ld %10ld\n",
xshmids[i].shm_perm.key,
IXSEQ_TO_IPCID(i, xshmids[i].shm_perm),
xshmids[i].shm_perm.mode,
xshmids[i].shm_segsz,
xshmids[i].shm_cpid,
xshmids[i].shm_lpid,
xshmids[i].shm_nattch,
xshmids[i].shm_perm.uid,
xshmids[i].shm_perm.gid,
xshmids[i].shm_perm.cuid,
xshmids[i].shm_perm.cgid,
xshmids[i].shm_atime,
xshmids[i].shm_dtime,
xshmids[i].shm_ctime);
}
}
destbuf = (char *) crealloc_abort (destbuf, bufptr - buf);
memcpy (destbuf, buf, bufptr - buf);
return bufptr - buf;
}