Convert utmp{x}name to int, return useful value. Define _PATH_UTMPX

* syscalls.cc (utmpname): Convert to int.  Return 0 if strdup
	worked, -1 otherwise.
	* include/utmpx.h (_PATH_UTMPX): Define as _PATH_UTMP.
	(utmpxname): Declare as int function.
	* include/sys/utmp.h (utmpname): Ditto.
	* include/cygwin/version.h: Bump API minor version.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

winsup/cygwin/include/cygwin/version.h

@@ -474,13 +474,14 @@ details. */
       290: Add sysconf cache handling.
       291: Export aligned_alloc, at_quick_exit, quick_exit.
       292: Export rpmatch.
+      293: Convert utmpname/utmpxname to int.
      */
 
      /* Note that we forgot to bump the api for ualarm, strtoll, strtoull,
 	sigaltstack, sethostname. */
 
 #define CYGWIN_VERSION_API_MAJOR 0
-#define CYGWIN_VERSION_API_MINOR 292
+#define CYGWIN_VERSION_API_MINOR 293
 
      /* There is also a compatibity version number associated with the
 	shared memory regions.  It is incremented when incompatible

winsup/cygwin/include/sys/utmp.h

@@ -40,7 +40,7 @@ extern struct utmp *getutline (const struct utmp *);
 extern struct utmp *pututline (const struct utmp *);
 extern void endutent (void);
 extern void setutent (void);
-extern void utmpname (const char *);
+extern int utmpname (const char *);
 
 void login (const struct utmp *);
 int logout (const char *);

winsup/cygwin/include/utmpx.h

@@ -12,6 +12,7 @@
 #include <cygwin/utmp.h>
 #include <sys/time.h>
 
+#define _PATH_UTMPX _PATH_UTMP
 #define UTMPX_FILE _PATH_UTMP
 
 #ifdef __cplusplus
@@ -46,7 +47,7 @@ extern struct utmpx *getutxid (const struct utmpx *id);
 extern struct utmpx *getutxline (const struct utmpx *line);
 extern struct utmpx *pututxline (const struct utmpx *utmpx);
 extern void setutxent (void);
-extern void utmpxname (const char *file);
+extern int utmpxname (const char *file);
 extern void updwtmpx (const char *file, const struct utmpx *utmpx);
 
 #ifdef __cplusplus

winsup/cygwin/release/2.4.0

@@ -42,6 +42,9 @@ What changed:
 - Fix (numeric and monetary) decimal point and thousands separator in
   fa_IR and ps_AF locales to be aligned with Linux.
 
+- utmpname/utmpxname are now defined as int functions as on Linux.
+  Addresses: https://cygwin.com/ml/cygwin/2015-12/msg00320.html
+
 
 Bug Fixes
 ---------

winsup/cygwin/syscalls.cc

@@ -3955,7 +3955,7 @@ endutent ()
     }
 }
 
-extern "C" void
+extern "C" int
 utmpname (const char *file)
 {
   __try
@@ -3964,13 +3964,17 @@ utmpname (const char *file)
 	{
 	  endutent ();
 	  utmp_file = strdup (file);
-	  debug_printf ("New UTMP file: %s", utmp_file);
-	  return;
+	  if (utmp_file)
+	    {
+	      debug_printf ("New UTMP file: %s", utmp_file);
+	      return 0;
+	    }
 	}
     }
-  __except (NO_ERROR) {}
+  __except (EFAULT) {}
   __endtry
-  debug_printf ("Invalid file");
+  debug_printf ("Setting UTMP file failed");
+  return -1;
 }
 
 EXPORT_ALIAS (utmpname, utmpxname)

winsup/doc/new-features.xml

@@ -52,6 +52,10 @@ Fix (numeric and monetary) decimal point and thousands separator in
 fa_IR and ps_AF locales to be aligned with Linux.
 </para></listitem>
 
+<listitem><para>
+utmpname/utmpxname are now defined as int functions as on Linux.
+</para></listitem>
+
 </itemizedlist>
 
 </sect2>