393 lines
9.6 KiB
C++
393 lines
9.6 KiB
C++
/* fhandler_procsysvipc.cc: fhandler for /proc/sysvipc virtual filesystem
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#include "winsup.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/cygwin.h>
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#include "cygerrno.h"
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#include "cygserver.h"
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#include "security.h"
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#include "path.h"
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#include "fhandler.h"
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#include "fhandler_virtual.h"
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#include "pinfo.h"
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#include "shared_info.h"
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#include "dtable.h"
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#include "cygheap.h"
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#include "ntdll.h"
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#include "cygtls.h"
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#include "tls_pbuf.h"
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#include <sys/param.h>
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#include <ctype.h>
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#define _COMPILING_NEWLIB
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#include <dirent.h>
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#define _KERNEL
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#include <sys/ipc.h>
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#include <sys/msg.h>
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#include <sys/sem.h>
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#include <sys/shm.h>
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static off_t format_procsysvipc_msg (void *, char *&);
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static off_t format_procsysvipc_sem (void *, char *&);
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static off_t format_procsysvipc_shm (void *, char *&);
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static const virt_tab_t procsysvipc_tab[] =
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{
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{ _VN ("."), FH_PROCSYSVIPC, virt_directory, NULL },
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{ _VN (".."), FH_PROCSYSVIPC, virt_directory, NULL },
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{ _VN ("msg"), FH_PROCSYSVIPC, virt_file, format_procsysvipc_msg },
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{ _VN ("sem"), FH_PROCSYSVIPC, virt_file, format_procsysvipc_sem },
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{ _VN ("shm"), FH_PROCSYSVIPC, virt_file, format_procsysvipc_shm },
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{ NULL, 0, FH_NADA, virt_none, NULL }
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};
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static const int PROCSYSVIPC_LINK_COUNT =
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(sizeof (procsysvipc_tab) / sizeof (virt_tab_t)) - 1;
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/* Returns 0 if path doesn't exist, >0 if path is a directory,
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* -1 if path is a file.
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*/
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virtual_ftype_t
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fhandler_procsysvipc::exists ()
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{
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const char *path = get_name ();
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debug_printf ("exists (%s)", path);
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path += proc_len + 1;
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while (*path != 0 && !isdirsep (*path))
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path++;
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if (*path == 0)
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return virt_rootdir;
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virt_tab_t *entry = virt_tab_search (path + 1, true, procsysvipc_tab,
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PROCSYSVIPC_LINK_COUNT);
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cygserver_init ();
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if (entry)
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{
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if (entry->type == virt_file)
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{
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if (cygserver_running != CYGSERVER_OK)
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return virt_none;
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}
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fileid = entry - procsysvipc_tab;
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return entry->type;
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}
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return virt_none;
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}
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fhandler_procsysvipc::fhandler_procsysvipc ():
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fhandler_proc ()
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{
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}
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int __reg2
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fhandler_procsysvipc::fstat (struct stat *buf)
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{
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fhandler_base::fstat (buf);
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buf->st_mode &= ~_IFMT & NO_W;
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int file_type = exists ();
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switch (file_type)
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{
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case virt_none:
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set_errno (ENOENT);
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return -1;
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case virt_directory:
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case virt_rootdir:
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buf->st_mode |= S_IFDIR | S_IXUSR | S_IXGRP | S_IXOTH;
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buf->st_nlink = 2;
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return 0;
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case virt_file:
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default:
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buf->st_mode |= S_IFREG | S_IRUSR | S_IRGRP | S_IROTH;
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return 0;
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}
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}
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int
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fhandler_procsysvipc::readdir (DIR *dir, dirent *de)
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{
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int res = ENMFILE;
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if (dir->__d_position >= PROCSYSVIPC_LINK_COUNT)
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goto out;
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{
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cygserver_init ();
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if (cygserver_running != CYGSERVER_OK)
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goto out;
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}
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strcpy (de->d_name, procsysvipc_tab[dir->__d_position].name);
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de->d_type = virt_ftype_to_dtype (procsysvipc_tab[dir->__d_position].type);
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dir->__d_position++;
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dir->__flags |= dirent_saw_dot | dirent_saw_dot_dot;
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res = 0;
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out:
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syscall_printf ("%d = readdir(%p, %p) (%s)", res, dir, de, de->d_name);
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return res;
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}
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int
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fhandler_procsysvipc::open (int flags, mode_t mode)
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{
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int res = fhandler_virtual::open (flags, mode);
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if (!res)
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goto out;
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nohandle (true);
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const char *path;
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path = get_name () + proc_len + 1;
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pid = atoi (path);
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while (*path != 0 && !isdirsep (*path))
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path++;
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if (*path == 0)
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{
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if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
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{
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set_errno (EEXIST);
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res = 0;
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goto out;
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}
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else if (flags & O_WRONLY)
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{
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set_errno (EISDIR);
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res = 0;
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goto out;
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}
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else
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{
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flags |= O_DIROPEN;
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goto success;
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}
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}
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virt_tab_t *entry;
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entry = virt_tab_search (path + 1, true, procsysvipc_tab, PROCSYSVIPC_LINK_COUNT);
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if (!entry)
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{
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set_errno ((flags & O_CREAT) ? EROFS : ENOENT);
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res = 0;
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goto out;
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}
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if (flags & O_WRONLY)
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{
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set_errno (EROFS);
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res = 0;
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goto out;
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}
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fileid = entry - procsysvipc_tab;
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if (!fill_filebuf ())
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{
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res = 0;
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goto out;
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}
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if (flags & O_APPEND)
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position = filesize;
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else
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position = 0;
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success:
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res = 1;
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set_flags ((flags & ~O_TEXT) | O_BINARY);
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set_open_status ();
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out:
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syscall_printf ("%d = fhandler_proc::open(%p, 0%o)", res, flags, mode);
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return res;
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}
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bool
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fhandler_procsysvipc::fill_filebuf ()
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{
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if (procsysvipc_tab[fileid].format_func)
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{
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filesize = procsysvipc_tab[fileid].format_func (NULL, filebuf);
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return true;
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}
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return false;
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}
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#define MSG_HEADLINE " key msqid perms cbytes qnum lspid lrpid uid gid cuid cgid stime rtime ctime\n"
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static off_t
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format_procsysvipc_msg (void *, char *&destbuf)
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{
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char *buf;
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struct msginfo msginfo;
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struct msqid_ds *xmsqids;
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msgctl (0, IPC_INFO, (struct msqid_ds *) &msginfo);
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/* Don't use tmp_pathbuf. The required buffer sizes can be up to 128K! */
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xmsqids = (struct msqid_ds *) malloc (sizeof (struct msqid_ds)
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* msginfo.msgmni);
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if (!xmsqids)
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return 0;
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/* buf size = sizeof headline + 128 bytes per msg queue entry. */
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buf = (char *) malloc (sizeof (MSG_HEADLINE) + msginfo.msgmni * 128);
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if (!buf)
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{
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free (xmsqids);
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return 0;
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}
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char *bufptr = stpcpy (buf, MSG_HEADLINE);
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msgctl (msginfo.msgmni, IPC_INFO, (struct msqid_ds *) xmsqids);
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for (int i = 0; i < msginfo.msgmni; i++)
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{
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if (xmsqids[i].msg_qbytes != 0)
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{
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bufptr += sprintf (bufptr,
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"%10llu %10u %5o %11u %10u %5d %5d %5u %5u %5u %5u "
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"%10ld %10ld %10ld\n",
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xmsqids[i].msg_perm.key,
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IXSEQ_TO_IPCID(i, xmsqids[i].msg_perm),
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xmsqids[i].msg_perm.mode,
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xmsqids[i].msg_cbytes,
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xmsqids[i].msg_qnum,
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xmsqids[i].msg_lspid,
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xmsqids[i].msg_lrpid,
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(unsigned) xmsqids[i].msg_perm.uid,
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(unsigned) xmsqids[i].msg_perm.gid,
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(unsigned) xmsqids[i].msg_perm.cuid,
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(unsigned) xmsqids[i].msg_perm.cgid,
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xmsqids[i].msg_stime,
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xmsqids[i].msg_rtime,
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xmsqids[i].msg_ctime);
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}
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}
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off_t size = bufptr - buf;
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destbuf = (char *) crealloc_abort (destbuf, size);
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memcpy (destbuf, buf, size);
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free (buf);
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free (xmsqids);
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return size;
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}
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#undef MSG_HEADLINE
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#define SEM_HEADLINE " key semid perms nsems uid gid cuid cgid otime ctime\n"
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static off_t
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format_procsysvipc_sem (void *, char *&destbuf)
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{
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char *buf;
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union semun semun;
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struct seminfo seminfo;
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struct semid_ds *xsemids;
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semun.buf = (struct semid_ds *) &seminfo;
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semctl (0, 0, IPC_INFO, semun);
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/* Don't use tmp_pathbuf. The required buffer sizes can be up to 96K! */
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xsemids = (struct semid_ds *) malloc (sizeof (struct semid_ds)
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* seminfo.semmni);
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if (!xsemids)
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return 0;
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/* buf size = sizeof headline + 96 bytes per semaphore entry. */
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buf = (char *) malloc (sizeof (SEM_HEADLINE) + seminfo.semmni * 96);
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if (!buf)
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{
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free (xsemids);
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return 0;
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}
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char *bufptr = stpcpy (buf, SEM_HEADLINE);
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semun.buf = xsemids;
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semctl (seminfo.semmni, 0, IPC_INFO, semun);
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for (int i = 0; i < seminfo.semmni; i++)
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{
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if ((xsemids[i].sem_perm.mode & SEM_ALLOC) != 0)
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{
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bufptr += sprintf (bufptr,
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"%10llu %10u %5o %10d %5u %5u %5u %5u %10ld %10ld\n",
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xsemids[i].sem_perm.key,
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IXSEQ_TO_IPCID(i, xsemids[i].sem_perm),
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xsemids[i].sem_perm.mode,
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xsemids[i].sem_nsems,
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(unsigned) xsemids[i].sem_perm.uid,
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(unsigned) xsemids[i].sem_perm.gid,
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(unsigned) xsemids[i].sem_perm.cuid,
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(unsigned) xsemids[i].sem_perm.cgid,
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xsemids[i].sem_otime,
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xsemids[i].sem_ctime);
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}
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}
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off_t size = bufptr - buf;
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destbuf = (char *) crealloc_abort (destbuf, size);
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memcpy (destbuf, buf, size);
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free (buf);
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free (xsemids);
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return size;
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}
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#undef SEM_HEADLINE
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#define SHM_HEADLINE " key shmid perms size cpid lpid nattch uid gid cuid cgid atime dtime ctime\n"
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static off_t
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format_procsysvipc_shm (void *, char *&destbuf)
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{
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char *buf;
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struct shminfo shminfo;
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struct shmid_ds *xshmids;
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shmctl (0, IPC_INFO, (struct shmid_ds *) &shminfo);
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/* Don't use tmp_pathbuf. The required buffer sizes can be up to 120K! */
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xshmids = (struct shmid_ds *) malloc (sizeof (struct shmid_ds)
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* shminfo.shmmni);
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if (!xshmids)
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return 0;
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/* buf size = sizeof headline + 120 bytes per shmem entry. */
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buf = (char *) malloc (sizeof (SHM_HEADLINE) + shminfo.shmmni * 120);
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if (!buf)
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{
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free (xshmids);
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return 0;
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}
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char *bufptr = stpcpy (buf, SHM_HEADLINE);
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shmctl (shminfo.shmmni, IPC_INFO, (struct shmid_ds *) xshmids);
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for (int i = 0; i < shminfo.shmmni; i++)
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{
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if (xshmids[i].shm_perm.mode & 0x0800)
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{
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bufptr += sprintf (bufptr,
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"%10llu %10u %5o %10u %5d %5d %6u %5u %5u %5u %5u "
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"%10ld %10ld %10ld\n",
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xshmids[i].shm_perm.key,
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IXSEQ_TO_IPCID(i, xshmids[i].shm_perm),
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xshmids[i].shm_perm.mode,
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xshmids[i].shm_segsz,
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xshmids[i].shm_cpid,
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xshmids[i].shm_lpid,
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xshmids[i].shm_nattch,
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(unsigned) xshmids[i].shm_perm.uid,
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(unsigned) xshmids[i].shm_perm.gid,
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(unsigned) xshmids[i].shm_perm.cuid,
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(unsigned) xshmids[i].shm_perm.cgid,
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xshmids[i].shm_atime,
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xshmids[i].shm_dtime,
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xshmids[i].shm_ctime);
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}
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}
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off_t size = bufptr - buf;
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destbuf = (char *) crealloc_abort (destbuf, size);
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memcpy (destbuf, buf, size);
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free (buf);
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free (xshmids);
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return size;
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}
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#undef SHM_HEADLINE
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