Implement /proc/sysvipc/*

* devices.in (dev_procsysvipc_storage): Add.
* devices.cc: Regenerate.
* devices.h (fh_devices): Add FH_PROCSYSVIPC.
* dtable.cc (build_fh_pc): Add case FH_PROCSYSVIPC.
* fhandler.h (class fhandler_procsysvipc): Declare.
(fhandler_union): Add __procsysvipc.
* fhandler_proc.cc (proc_tab): Add sysvipc virt_directory.
* fhandler_procsysvipc.cc: New file.
* Makefile.in (DLL_OFILES): Add fhandler_procsysvipc.o.
* path.h (isproc_dev): Add FH_PROCSYSVIPC to conditional.

1 files changed, 347 insertions, 0 deletions

diff --git a/winsup/cygwin/fhandler_procsysvipc.cc b/winsup/cygwin/fhandler_procsysvipc.cc
new file mode 100644
index 000000000..a486a2944
--- /dev/null
+++ b/winsup/cygwin/fhandler_procsysvipc.cc
@@ -0,0 +1,347 @@
+/* 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[] =
+{
+  { _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,	        0,                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)
+        {
+          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,
+            "       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,
+                 "%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,
+            "       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,
+                "%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,
+            "       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,
+                "%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;
+}