Added. These functions are commonly used. Misc cleanups.

* glibtop_server.h:
	* glibtop_server.c: (try_file_to_buffer), (file_to_buffer): Added. These
	functions are commonly used. Misc cleanups.

	* cpu.c: (glibtop_get_cpu_s):
	* loadavg.c: (glibtop_get_loadavg_s):
	* mem.c: (glibtop_get_mem_s):
	* open.c: (glibtop_open_s):
	* swap.c: (glibtop_get_swap_s):
	* sysinfo.c: (init_sysinfo):
	* uptime.c: (glibtop_get_uptime_s): Replaced open/read/close by file_to_buffer().

sysdeps/linux/glibtop_server.h

@@ -21,8 +21,10 @@
    Boston, MA 02111-1307, USA.
 */
 
-#ifndef __GLIBTOP_SERVER_H__
-#define __GLIBTOP_SERVER_H__
+#ifndef __LINUX__GLIBTOP_SERVER_H__
+#define __LINUX__GLIBTOP_SERVER_H__
+
+#include <glibtop.h>
 
 #include <glib.h>
 
@@ -36,8 +38,10 @@ G_BEGIN_DECLS
 
 #define LINUX_VERSION(x,y,z)   (0x10000*(x) + 0x100*(y) + z)
 
+
 unsigned get_pageshift();
 
+
 static inline char *
 skip_token (const char *p)
 {
@@ -55,6 +59,7 @@ skip_multiple_token (const char *p, size_t count)
 	return (char *)p;
 }
 
+
 static inline char *
 skip_line (const char *p)
 {
@@ -62,12 +67,29 @@ skip_line (const char *p)
 	return (char *) (*p ? p+1 : p);
 }
 
+
 unsigned long long
 get_scaled(const char *buffer, const char *key);
 
 
+/* aborts on error */
+void
+file_to_buffer(glibtop *server, char *buffer, const char *filename);
+
+/* return < 0 on error, otherwise 0 on success */
 int
-proc_file_to_buffer (char *buffer, const char *fmt, pid_t pid);
+try_file_to_buffer(char *buffer, const char *format, ...);
+
+
+/* some inline functions that wrap proc path
+ * as fast as macros :)
+ */
+
+static inline int
+proc_file_to_buffer (char *buffer, const char *fmt, pid_t pid)
+{
+	return try_file_to_buffer(buffer, fmt, pid);
+}
 
 static inline int
 proc_stat_to_buffer (char *buffer, pid_t pid)
@@ -87,6 +109,7 @@ proc_statm_to_buffer (char *buffer, pid_t pid)
 	return proc_file_to_buffer (buffer, "/proc/%d/statm", pid);
 }
 
+
 static inline char *
 proc_stat_after_cmd (char *p)
 {
@@ -121,4 +144,4 @@ proc_stat_after_cmd (char *p)
 
 G_END_DECLS
 
-#endif
+#endif /* __LINUX__GLIBTOP_SERVER_H__ */