top: do not refresh like crazy

NEWS

@@ -2,6 +2,10 @@ procps-3.1.6 --> procps-3.1.7
 
 watch: --help now explains -t, --no-title    #182246
 ps: warning directs users to the FAQ
+top: batch mode can refresh by fractional seconds
+top: faster start-up
+top: do not refresh like crazy
+ps: better crash message
 
 procps-3.1.5 --> procps-3.1.6
 

README

@@ -1,7 +1,8 @@
 COMPATIBILITY
 
-    This code is intended for use with Linux 2.0.xx and above.
+    This code is intended for use with Linux 2.2.xx, 2.4.xx,
-    Both libc 5 and libc 6 should work.
+    2.5.xx, and hopefully all future kernels. You should be
+    running a system with libc 6, but libc 5 might work too.
 
 INSTALLATION
 

proc/ksym.c

@@ -266,7 +266,7 @@ hell:
   *bufp = NULL;
   *roomp = 0;   /* this function will never work again */
   total = 0;
-  close(fd);
+  if(fd>0) close(fd);
   return;
 }
 

proc/library.map

@@ -9,7 +9,7 @@ global:
   display_version; procps_version; linux_version_code;
   Hertz; smp_num_cpus;
   sprint_uptime; uptime; user_from_uid; print_uptime; loadavg;
-  pretty_print_signals; print_given_signals; unix_print_signals; signal_name_to_number;
+  pretty_print_signals; print_given_signals; unix_print_signals; signal_name_to_number; signal_number_to_name;
   meminfo; vminfo;
   kb_active; kb_inactive; kb_main_buffers; kb_main_cached;
   kb_main_free; kb_main_total; kb_main_used; kb_swap_free;

proc/sig.c

@@ -146,7 +146,7 @@ int signal_name_to_number(const char *restrict name){
   return val+offset;
 }
 
-static const char *signal_number_to_name(int signo){
+const char *signal_number_to_name(int signo){
   static char buf[32];
   int n = number_of_signals;
   signo &= 0x7f; /* need to process exit values too */

proc/sig.h

@@ -18,6 +18,8 @@ EXTERN_C_BEGIN
 /* return -1 on failure */
 extern int signal_name_to_number(const char *restrict name);
 
+extern const char *signal_number_to_name(int signo);
+
 extern int print_given_signals(int argc, const char *restrict const *restrict argv, int max_line);
 
 extern void pretty_print_signals(void);

ps/display.c

@@ -40,9 +40,10 @@ static void signal_handler(int signo){
   /* fprintf() is not reentrant, but we _exit() anyway */
   fprintf(stderr,
     "\n\n"
-    "Signal %d caught by ps (%s).\n"
+    "Signal %d (%s) caught by ps (%s).\n"
-    "Please send bug reports to <acahalan@cs.uml.edu>\n",
+    "Please send bug reports to <feedback@lists.sf.net> or <albert@users.sf.net>\n",
     signo,
+    signal_number_to_name(signo),
     procps_version
   );
   _exit(signo+128);

ps/parser.c

@@ -1,5 +1,5 @@
 /*
- * Copyright 1998-2002 by Albert Cahalan; all rights reserved.
+ * Copyright 1998-2003 by Albert Cahalan; all rights reserved.
  * This file may be used subject to the terms and conditions of the
  * GNU Library General Public License Version 2, or any later version
  * at your option, as published by the Free Software Foundation.

top.c

@@ -87,6 +87,10 @@ static int   Monpidsidx = 0;
 static char Msg_delayed [SMLBUFSIZ];
 static int  Msg_awaiting = 0;
 
+// This is the select() timeout. Clear it in sig handlers to avoid a race.
+static volatile struct timeval tv;
+#define ZAP_TIMEOUT do{tv.tv_usec=0; tv.tv_sec=0;}while(0);
+
         /* Configurable Display support ##################################*/
 
         /* Current screen dimensions.
@@ -437,6 +441,7 @@ static void suspend (int dont_care_sig)
    fflush(stdout);
    raise(SIGSTOP);
       /* later, after SIGCONT... */
+   ZAP_TIMEOUT
    if (!Batch)
       tcsetattr(STDIN_FILENO, TCSAFLUSH, &Rawtty);
 }
@@ -2310,6 +2315,7 @@ static void wins_resize (int dont_care_sig)
 
    // force rebuild of column headers AND libproc/readproc requirements
    Frames_libflags = 0;
+   ZAP_TIMEOUT
 }
 
 
@@ -2804,7 +2810,12 @@ static proc_t **summary_show (void)
    if (!p_table) {
       p_table = procs_refresh(NULL, Frames_libflags);
       putp(Cap_clr_scr);
-      sleep(1);
+#ifndef PROF
+      // sleep for half a second
+      tv.tv_sec = 0;
+      tv.tv_usec = 500000;
+      select(0, NULL, NULL, NULL, &tv);  // ought to loop until done
+#endif
    } else
       putp(Batch ? "\n\n" : Cap_home);
    p_table = procs_refresh(p_table, Frames_libflags);
@@ -2812,13 +2823,14 @@ static proc_t **summary_show (void)
    /*
     ** Display Uptime and Loadavg */
    if (CHKw(Curwin, View_LOADAV)) {
-      if (!Rc.mode_altscr)
+      if (!Rc.mode_altscr) {
          show_special(0, fmtmk(LOADAV_line, Myname, sprint_uptime()));
-      else
+      } else {
          show_special(0, fmtmk(CHKw(Curwin, VISIBLE_tsk)
             ? LOADAV_line_alt
             : LOADAV_line
             , Curwin->grpname, sprint_uptime()));
+      }
       Msg_row += 1;
    }
 
@@ -3228,26 +3240,30 @@ int main (int dont_care_argc, char **argv)
    signal(SIGWINCH, wins_resize);
 
    for (;;) {
-      struct timeval tv;
+      frame_make();
-      fd_set fs;
-      char c;
-                                        //                     This is it?
-      frame_make();                     //                     Impossible!
 
       if (Msg_awaiting) show_msg(Msg_delayed);
       if (0 < Loops) --Loops;
       if (!Loops) end_pgm(0);
 
-      if (Batch)
+      tv.tv_sec = Rc.delay_time;
-         sleep((unsigned)Rc.delay_time);
-      else {                            //   Linux reports time not slept,
-         tv.tv_sec = Rc.delay_time;     //   so we must reinit every time.
       tv.tv_usec = (Rc.delay_time - (int)Rc.delay_time) * 1000000;
+
+      if (Batch) {
+         select(0, NULL, NULL, NULL, &tv);  // ought to loop until done
+      } else {
+         long file_flags;
+         char c;
+         fd_set fs;
          FD_ZERO(&fs);
          FD_SET(STDIN_FILENO, &fs);
-         if (0 < select(STDIN_FILENO+1, &fs, NULL, NULL, &tv)
+         file_flags = fcntl(STDIN_FILENO, F_GETFL);
-         &&  0 < chin(0, &c, 1))
+         if(file_flags==-1) file_flags=0;
-            do_key((unsigned)c);
+         fcntl(STDIN_FILENO, F_SETFL, O_NONBLOCK|file_flags);
+         // check 1st, in case tv zeroed (by sig handler) before it got set
+         if (chin(0, &c, 1) <= 0) select(1, &fs, NULL, NULL, &tv);
+         if (chin(0, &c, 1) > 0) do_key((unsigned)c);
+         fcntl(STDIN_FILENO, F_SETFL, file_flags);
       }
    }
 

watch.c

@@ -7,7 +7,7 @@
  * handling, unlimited command length, long line handling) added Apr 1999 by
  * Mike Coleman <mkc@acm.org>.
  *
- * Changes by Albert Cahalan, 2002.
+ * Changes by Albert Cahalan, 2002-2003.
  */
 
 #define VERSION "0.2.0"