implement SysInfo::MaxSharedMemorySize for openbsd using...

base/sys_info_posix.cc

 // Copyright (c) 2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/sys_info.h"
 
 #include <errno.h>
 #include <string.h>
 #include <sys/statvfs.h>
 #include <sys/utsname.h>
 #include <unistd.h>
 
 #if !defined(OS_MACOSX)
 #include <gdk/gdk.h>
 #endif
 
 #if defined(OS_OPENBSD)
+#include <stdlib.h>
 #include <sys/param.h>
+#include <sys/shm.h>
 #include <sys/sysctl.h>
 #endif
 
 #include "base/basictypes.h"
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/utf_string_conversions.h"
 
 namespace base {
 
@@ skipping 135 matching lines @@
 
   if (!limit_valid) {
     std::string contents;
     file_util::ReadFileToString(FilePath("/proc/sys/kernel/shmmax"), &contents);
     limit = strtoul(contents.c_str(), NULL, 0);
     limit_valid = true;
   }
 
   return limit;
 }
+#elif defined(OS_OPENBSD)
+size_t SysInfo::MaxSharedMemorySize() {
+  int mib[3], valid;
+
+  mib[0] = CTL_KERN;
+  mib[1] = KERN_SYSVSHM;
+  size_t len = sizeof(valid);
+  if (sysctl(mib, 2, &valid, &len, NULL, NULL) < 0) {
+    return -1;
+  }
+  if (!valid) {
+    return -1;
+  }
+
+  mib[0] = CTL_KERN;
+  mib[1] = KERN_SYSVIPC_INFO;
+  mib[2] = KERN_SYSVIPC_SHM_INFO;
+  len = sizeof(struct shminfo);
+  void *buf = malloc(len);
+  if (buf == NULL) {
+    return -1;
+  }
+  struct shm_sysctl_info *shmsi = (struct shm_sysctl_info *)buf;

[djm, 2009/12/09 02:25:58]

Why do you allocate this by malloc and not automatically on the stack?

[pvalchev, 2009/12/09 19:08:22]

No reason, refactoring that got left behind :) Thx for pointing it out Damien!

+  if (sysctl(mib, 3, shmsi, &len, NULL, NULL) < 0) {
+    return -1;
+  }
+
+  return shmsi->shminfo.shmmax;
+}
 #endif
 
 }  // namespace base