X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/30984deafc05d7c6f88db736336fe73d23a08e19..3a6ec3c88033c43e108cb1f302717696682eb34f:/src/unix/snglinst.cpp

diff --git a/src/unix/snglinst.cpp b/src/unix/snglinst.cpp
index af5e2063a5..1ce464edfa 100644
--- a/src/unix/snglinst.cpp
+++ b/src/unix/snglinst.cpp
@@ -1,5 +1,5 @@
 ///////////////////////////////////////////////////////////////////////////////
-// Name:        unix/snglinst.cpp
+// Name:        src/unix/snglinst.cpp
 // Purpose:     implements wxSingleInstanceChecker class for Unix using
 //              lock files with fcntl(2) or flock(2)
 // Author:      Vadim Zeitlin
@@ -18,10 +18,6 @@
 // headers
 // ----------------------------------------------------------------------------
 
-#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
-    #pragma implementation "snglinst.h"
-#endif
-
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
@@ -35,10 +31,10 @@
     #include "wx/string.h"
     #include "wx/log.h"
     #include "wx/intl.h"
+    #include "wx/utils.h"           // wxGetHomeDir()
 #endif //WX_PRECOMP
 
 #include "wx/file.h"
-#include "wx/utils.h"           // wxGetHomeDir()
 
 #include "wx/snglinst.h"
 
@@ -89,9 +85,9 @@ static int wxLockFile(int fd, LockOperation lock)
     fl.l_type = lock == LOCK ? F_WRLCK : F_UNLCK;
 
     // lock the entire file
-    fl.l_whence =
     fl.l_start =
-    fl.l_len = 0;
+    fl.l_len =
+    fl.l_whence = 0;
 
     // is this needed?
     fl.l_pid = getpid();
@@ -187,7 +183,7 @@ LockResult wxSingleInstanceCheckerImpl::CreateLockFile()
                               m_nameLock.c_str());
 
                 Unlock();
-                
+
                 return LOCK_ERROR;
             }
 
@@ -230,11 +226,11 @@ bool wxSingleInstanceCheckerImpl::Create(const wxString& name)
 
         case LOCK_CREATED:
             // nothing more to do
-            return TRUE;
+            return true;
 
         case LOCK_ERROR:
             // oops...
-            return FALSE;
+            return false;
     }
 
     // Check if the file is owned by current user and has 0600 permissions.
@@ -273,12 +269,12 @@ bool wxSingleInstanceCheckerImpl::Create(const wxString& name)
         // rarely in practice that we don't care
         wxLogError(_("Failed to access lock file."));
 
-        return FALSE;
+        return false;
     }
 
     char buf[256];
-    size_t count = file.Read(buf, WXSIZEOF(buf));
-    if ( count == (size_t)wxInvalidOffset )
+    ssize_t count = file.Read(buf, WXSIZEOF(buf));
+    if ( count == wxInvalidOffset )
     {
         wxLogError(_("Failed to read PID from lock file."));
     }
@@ -293,7 +289,7 @@ bool wxSingleInstanceCheckerImpl::Create(const wxString& name)
                     wxLogError(_("Failed to remove stale lock file '%s'."),
                                name.c_str());
 
-                    // return TRUE in this case for now...
+                    // return true in this case for now...
                 }
                 else
                 {
@@ -312,7 +308,7 @@ bool wxSingleInstanceCheckerImpl::Create(const wxString& name)
         }
     }
 
-    // return TRUE if we could get the PID of the process owning the lock file
+    // return true if we could get the PID of the process owning the lock file
     // (whether it is still running or not), FALSE otherwise as it is
     // unexpected
     return m_pidLocker != 0;
@@ -377,11 +373,21 @@ bool wxSingleInstanceChecker::Create(const wxString& name,
 
 bool wxSingleInstanceChecker::IsAnotherRunning() const
 {
-    wxCHECK_MSG( m_impl, FALSE, _T("must call Create() first") );
+    wxCHECK_MSG( m_impl, false, _T("must call Create() first") );
+
+    const pid_t lockerPid = m_impl->GetLockerPID();
+
+    if ( !lockerPid )
+    {
+        // we failed to open the lock file, return false as we're definitely
+        // not sure that another our process is running and so it's better not
+        // to prevent this one from starting up
+        return false;
+    }
 
     // if another instance is running, it must own the lock file - otherwise
     // we have it and the locker PID is ours one
-    return m_impl->GetLockerPID() != getpid();
+    return lockerPid != getpid();
 }
 
 wxSingleInstanceChecker::~wxSingleInstanceChecker()
@@ -390,4 +396,3 @@ wxSingleInstanceChecker::~wxSingleInstanceChecker()
 }
 
 #endif // wxUSE_SNGLINST_CHECKER
-