1008 lines
21 KiB
C
1008 lines
21 KiB
C
char *copyright =
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"Copyright (c) 1984 through 1996, William LeFebvre";
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/*
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* Top users/processes display for Unix
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* Version 3
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*
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* This program may be freely redistributed,
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* but this entire comment MUST remain intact.
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*
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* Copyright (c) 1984, 1989, William LeFebvre, Rice University
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* Copyright (c) 1989, 1990, 1992, William LeFebvre, Northwestern University
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*/
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/*
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* See the file "Changes" for information on version-to-version changes.
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*/
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/*
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* This file contains "main" and other high-level routines.
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*/
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/*
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* The following preprocessor variables, when defined, are used to
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* distinguish between different Unix implementations:
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*
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* SIGHOLD - use SVR4 sighold function when defined
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* SIGRELSE - use SVR4 sigrelse function when defined
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* FD_SET - macros FD_SET and FD_ZERO are used when defined
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*/
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#include "os.h"
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#include <signal.h>
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#include <setjmp.h>
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#include <ctype.h>
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#include <sys/time.h>
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/* includes specific to top */
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#include "display.h" /* interface to display package */
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#include "screen.h" /* interface to screen package */
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#include "top.h"
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#include "top.local.h"
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#include "boolean.h"
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#include "machine.h"
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#include "utils.h"
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/* Size of the stdio buffer given to stdout */
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#define Buffersize 2048
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/* The buffer that stdio will use */
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char stdoutbuf[Buffersize];
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/* build Signal masks */
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#define Smask(s) (1 << ((s) - 1))
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/* for system errors */
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extern int errno;
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/* for getopt: */
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extern int optind;
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extern char *optarg;
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/* imported from screen.c */
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extern int overstrike;
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/* signal handling routines */
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sigret_t leave();
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sigret_t onalrm();
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sigret_t tstop();
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#ifdef SIGWINCH
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sigret_t winch();
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#endif
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/* internal routines */
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void quit();
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/* values which need to be accessed by signal handlers */
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static int max_topn; /* maximum displayable processes */
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/* miscellaneous things */
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char *myname = "top";
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jmp_buf jmp_int;
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/* routines that don't return int */
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char *username();
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char *ctime();
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char *kill_procs();
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char *renice_procs();
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#ifdef ORDER
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extern int (*proc_compares[])();
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#else
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extern int proc_compare();
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#endif
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time_t time();
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caddr_t get_process_info();
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/* different routines for displaying the user's identification */
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/* (values assigned to get_userid) */
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char *username();
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char *itoa7();
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/* display routines that need to be predeclared */
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int i_loadave();
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int u_loadave();
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int i_procstates();
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int u_procstates();
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int i_cpustates();
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int u_cpustates();
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int i_memory();
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int u_memory();
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int i_swap();
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int u_swap();
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int i_message();
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int u_message();
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int i_header();
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int u_header();
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int i_process();
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int u_process();
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/* pointers to display routines */
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int (*d_loadave)() = i_loadave;
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int (*d_procstates)() = i_procstates;
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int (*d_cpustates)() = i_cpustates;
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int (*d_memory)() = i_memory;
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int (*d_swap)() = i_swap;
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int (*d_message)() = i_message;
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int (*d_header)() = i_header;
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int (*d_process)() = i_process;
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main(argc, argv)
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int argc;
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char *argv[];
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{
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register int i;
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register int active_procs;
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register int change;
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struct system_info system_info;
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struct statics statics;
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caddr_t processes;
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static char tempbuf1[50];
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static char tempbuf2[50];
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int old_sigmask; /* only used for BSD-style signals */
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int topn = Default_TOPN;
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int delay = Default_DELAY;
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int displays = 0; /* indicates unspecified */
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time_t curr_time;
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char *(*get_userid)() = username;
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char *uname_field = "USERNAME";
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char *header_text;
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char *env_top;
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char **preset_argv;
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int preset_argc = 0;
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char **av;
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int ac;
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char dostates = No;
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char do_unames = Yes;
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char interactive = Maybe;
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char warnings = 0;
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#if Default_TOPN == Infinity
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char topn_specified = No;
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#endif
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char ch;
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char *iptr;
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char no_command = 1;
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struct timeval timeout;
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struct process_select ps;
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#ifdef ORDER
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char *order_name = NULL;
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int order_index = 0;
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#endif
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#ifndef FD_SET
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/* FD_SET and friends are not present: fake it */
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typedef int fd_set;
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#define FD_ZERO(x) (*(x) = 0)
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#define FD_SET(f, x) (*(x) = f)
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#endif
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fd_set readfds;
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#ifdef ORDER
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static char command_chars[] = "\f qh?en#sdkriIuo";
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#else
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static char command_chars[] = "\f qh?en#sdkriIu";
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#endif
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/* these defines enumerate the "strchr"s of the commands in command_chars */
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#define CMD_redraw 0
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#define CMD_update 1
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#define CMD_quit 2
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#define CMD_help1 3
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#define CMD_help2 4
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#define CMD_OSLIMIT 4 /* terminals with OS can only handle commands */
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#define CMD_errors 5 /* less than or equal to CMD_OSLIMIT */
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#define CMD_number1 6
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#define CMD_number2 7
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#define CMD_delay 8
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#define CMD_displays 9
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#define CMD_kill 10
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#define CMD_renice 11
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#define CMD_idletog 12
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#define CMD_idletog2 13
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#define CMD_user 14
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#ifdef ORDER
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#define CMD_order 15
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#endif
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/* set the buffer for stdout */
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#ifdef DEBUG
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setbuffer(stdout, NULL, 0);
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#else
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setbuffer(stdout, stdoutbuf, Buffersize);
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#endif
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/* get our name */
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if (argc > 0)
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{
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if ((myname = strrchr(argv[0], '/')) == 0)
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{
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myname = argv[0];
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}
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else
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{
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myname++;
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}
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}
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/* initialize some selection options */
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ps.idle = Yes;
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ps.system = No;
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ps.uid = -1;
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ps.command = NULL;
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/* get preset options from the environment */
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if ((env_top = getenv("TOP")) != NULL)
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{
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av = preset_argv = argparse(env_top, &preset_argc);
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ac = preset_argc;
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/* set the dummy argument to an explanatory message, in case
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getopt encounters a bad argument */
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preset_argv[0] = "while processing environment";
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}
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/* process options */
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do {
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/* if we're done doing the presets, then process the real arguments */
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if (preset_argc == 0)
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{
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ac = argc;
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av = argv;
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/* this should keep getopt happy... */
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optind = 1;
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}
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while ((i = getopt(ac, av, "SIbinqus:d:U:o:")) != EOF)
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{
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switch(i)
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{
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case 'u': /* toggle uid/username display */
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do_unames = !do_unames;
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break;
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case 'U': /* display only username's processes */
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if ((ps.uid = userid(optarg)) == -1)
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{
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fprintf(stderr, "%s: unknown user\n", optarg);
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exit(1);
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}
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break;
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case 'S': /* show system processes */
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ps.system = !ps.system;
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break;
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case 'I': /* show idle processes */
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ps.idle = !ps.idle;
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break;
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case 'i': /* go interactive regardless */
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interactive = Yes;
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break;
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case 'n': /* batch, or non-interactive */
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case 'b':
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interactive = No;
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break;
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case 'd': /* number of displays to show */
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if ((i = atoiwi(optarg)) == Invalid || i == 0)
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{
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fprintf(stderr,
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"%s: warning: display count should be positive -- option ignored\n",
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myname);
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warnings++;
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}
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else
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{
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displays = i;
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}
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break;
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case 's':
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if ((delay = atoi(optarg)) < 0)
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{
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fprintf(stderr,
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"%s: warning: seconds delay should be non-negative -- using default\n",
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myname);
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delay = Default_DELAY;
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warnings++;
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}
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break;
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case 'q': /* be quick about it */
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/* only allow this if user is really root */
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if (getuid() == 0)
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{
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/* be very un-nice! */
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(void) nice(-20);
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}
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else
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{
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fprintf(stderr,
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"%s: warning: `-q' option can only be used by root\n",
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myname);
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warnings++;
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}
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break;
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case 'o': /* select sort order */
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#ifdef ORDER
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order_name = optarg;
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#else
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fprintf(stderr,
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"%s: this platform does not support arbitrary ordering. Sorry.\n",
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myname);
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warnings++;
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#endif
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break;
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default:
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fprintf(stderr, "\
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Top version %s\n\
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Usage: %s [-ISbinqu] [-d x] [-s x] [-o field] [-U username] [number]\n",
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version_string(), myname);
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exit(1);
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}
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}
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/* get count of top processes to display (if any) */
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if (optind < ac)
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{
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if ((topn = atoiwi(av[optind])) == Invalid)
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{
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fprintf(stderr,
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"%s: warning: process display count should be non-negative -- using default\n",
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myname);
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warnings++;
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}
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#if Default_TOPN == Infinity
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else
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{
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topn_specified = Yes;
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}
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#endif
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}
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/* tricky: remember old value of preset_argc & set preset_argc = 0 */
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i = preset_argc;
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preset_argc = 0;
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/* repeat only if we really did the preset arguments */
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} while (i != 0);
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/* set constants for username/uid display correctly */
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if (!do_unames)
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{
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uname_field = " UID ";
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get_userid = itoa7;
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}
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/* initialize the kernel memory interface */
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if (machine_init(&statics) == -1)
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{
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exit(1);
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}
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#ifdef ORDER
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/* determine sorting order index, if necessary */
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if (order_name != NULL)
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{
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if ((order_index = string_index(order_name, statics.order_names)) == -1)
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{
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char **pp;
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fprintf(stderr, "%s: '%s' is not a recognized sorting order.\n",
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myname, order_name);
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fprintf(stderr, "\tTry one of these:");
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pp = statics.order_names;
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while (*pp != NULL)
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{
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fprintf(stderr, " %s", *pp++);
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}
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fputc('\n', stderr);
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exit(1);
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}
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}
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#endif
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#ifdef no_initialization_needed
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/* initialize the hashing stuff */
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if (do_unames)
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{
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init_hash();
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}
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#endif
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/* initialize termcap */
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init_termcap(interactive);
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/* get the string to use for the process area header */
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header_text = format_header(uname_field);
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/* initialize display interface */
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if ((max_topn = display_init(&statics)) == -1)
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{
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fprintf(stderr, "%s: can't allocate sufficient memory\n", myname);
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exit(4);
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}
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/* print warning if user requested more processes than we can display */
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if (topn > max_topn)
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{
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fprintf(stderr,
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"%s: warning: this terminal can only display %d processes.\n",
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myname, max_topn);
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warnings++;
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}
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/* adjust for topn == Infinity */
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if (topn == Infinity)
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{
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/*
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* For smart terminals, infinity really means everything that can
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* be displayed, or Largest.
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* On dumb terminals, infinity means every process in the system!
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* We only really want to do that if it was explicitly specified.
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* This is always the case when "Default_TOPN != Infinity". But if
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* topn wasn't explicitly specified and we are on a dumb terminal
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* and the default is Infinity, then (and only then) we use
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* "Nominal_TOPN" instead.
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*/
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#if Default_TOPN == Infinity
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topn = smart_terminal ? Largest :
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(topn_specified ? Largest : Nominal_TOPN);
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#else
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topn = Largest;
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#endif
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}
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/* set header display accordingly */
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display_header(topn > 0);
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/* determine interactive state */
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if (interactive == Maybe)
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{
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interactive = smart_terminal;
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}
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/* if # of displays not specified, fill it in */
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if (displays == 0)
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{
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displays = smart_terminal ? Infinity : 1;
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}
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/* hold interrupt signals while setting up the screen and the handlers */
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#ifdef SIGHOLD
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sighold(SIGINT);
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sighold(SIGQUIT);
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sighold(SIGTSTP);
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#else
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old_sigmask = sigblock(Smask(SIGINT) | Smask(SIGQUIT) | Smask(SIGTSTP));
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#endif
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init_screen();
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(void) signal(SIGINT, leave);
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(void) signal(SIGQUIT, leave);
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(void) signal(SIGTSTP, tstop);
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#ifdef SIGWINCH
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(void) signal(SIGWINCH, winch);
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#endif
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#ifdef SIGRELSE
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sigrelse(SIGINT);
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sigrelse(SIGQUIT);
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sigrelse(SIGTSTP);
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#else
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(void) sigsetmask(old_sigmask);
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#endif
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if (warnings)
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{
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fputs("....", stderr);
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fflush(stderr); /* why must I do this? */
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sleep((unsigned)(3 * warnings));
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fputc('\n', stderr);
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}
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/* setup the jump buffer for stops */
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if (setjmp(jmp_int) != 0)
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{
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/* control ends up here after an interrupt */
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reset_display();
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}
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/*
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* main loop -- repeat while display count is positive or while it
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* indicates infinity (by being -1)
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*/
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while ((displays == -1) || (displays-- > 0))
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{
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/* get the current stats */
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get_system_info(&system_info);
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/* get the current set of processes */
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processes =
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get_process_info(&system_info,
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&ps,
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#ifdef ORDER
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proc_compares[order_index]);
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#else
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proc_compare);
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#endif
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/* display the load averages */
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(*d_loadave)(system_info.last_pid,
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system_info.load_avg);
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/* display the current time */
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/* this method of getting the time SHOULD be fairly portable */
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time(&curr_time);
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i_timeofday(&curr_time);
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/* display process state breakdown */
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(*d_procstates)(system_info.p_total,
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system_info.procstates);
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/* display the cpu state percentage breakdown */
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if (dostates) /* but not the first time */
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{
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(*d_cpustates)(system_info.cpustates);
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}
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else
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{
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/* we'll do it next time */
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if (smart_terminal)
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{
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z_cpustates();
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}
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else
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{
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putchar('\n');
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}
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dostates = Yes;
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}
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/* display memory stats */
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(*d_memory)(system_info.memory);
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/* display swap stats */
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(*d_swap)(system_info.swap);
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/* handle message area */
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(*d_message)();
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/* update the header area */
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(*d_header)(header_text);
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if (topn > 0)
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{
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/* determine number of processes to actually display */
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/* this number will be the smallest of: active processes,
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number user requested, number current screen accomodates */
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active_procs = system_info.p_active;
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if (active_procs > topn)
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{
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active_procs = topn;
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}
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if (active_procs > max_topn)
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{
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active_procs = max_topn;
|
|
}
|
|
|
|
/* now show the top "n" processes. */
|
|
for (i = 0; i < active_procs; i++)
|
|
{
|
|
(*d_process)(i, format_next_process(processes, get_userid));
|
|
}
|
|
}
|
|
else
|
|
{
|
|
i = 0;
|
|
}
|
|
|
|
/* do end-screen processing */
|
|
u_endscreen(i);
|
|
|
|
/* now, flush the output buffer */
|
|
fflush(stdout);
|
|
|
|
/* only do the rest if we have more displays to show */
|
|
if (displays)
|
|
{
|
|
/* switch out for new display on smart terminals */
|
|
if (smart_terminal)
|
|
{
|
|
if (overstrike)
|
|
{
|
|
reset_display();
|
|
}
|
|
else
|
|
{
|
|
d_loadave = u_loadave;
|
|
d_procstates = u_procstates;
|
|
d_cpustates = u_cpustates;
|
|
d_memory = u_memory;
|
|
d_swap = u_swap;
|
|
d_message = u_message;
|
|
d_header = u_header;
|
|
d_process = u_process;
|
|
}
|
|
}
|
|
|
|
no_command = Yes;
|
|
if (!interactive)
|
|
{
|
|
/* set up alarm */
|
|
(void) signal(SIGALRM, onalrm);
|
|
(void) alarm((unsigned)delay);
|
|
|
|
/* wait for the rest of it .... */
|
|
pause();
|
|
}
|
|
else while (no_command)
|
|
{
|
|
/* assume valid command unless told otherwise */
|
|
no_command = No;
|
|
|
|
/* set up arguments for select with timeout */
|
|
FD_ZERO(&readfds);
|
|
FD_SET(1, &readfds); /* for standard input */
|
|
timeout.tv_sec = delay;
|
|
timeout.tv_usec = 0;
|
|
|
|
/* wait for either input or the end of the delay period */
|
|
if (select(32, &readfds, (fd_set *)NULL, (fd_set *)NULL, &timeout) > 0)
|
|
{
|
|
int newval;
|
|
char *errmsg;
|
|
|
|
/* something to read -- clear the message area first */
|
|
clear_message();
|
|
|
|
/* now read it and convert to command strchr */
|
|
/* (use "change" as a temporary to hold strchr) */
|
|
(void) read(0, &ch, 1);
|
|
if ((iptr = strchr(command_chars, ch)) == NULL)
|
|
{
|
|
if (ch != '\r' && ch != '\n')
|
|
{
|
|
/* illegal command */
|
|
new_message(MT_standout, " Command not understood");
|
|
}
|
|
putchar('\r');
|
|
no_command = Yes;
|
|
}
|
|
else
|
|
{
|
|
change = iptr - command_chars;
|
|
if (overstrike && change > CMD_OSLIMIT)
|
|
{
|
|
/* error */
|
|
new_message(MT_standout,
|
|
" Command cannot be handled by this terminal");
|
|
putchar('\r');
|
|
no_command = Yes;
|
|
}
|
|
else switch(change)
|
|
{
|
|
case CMD_redraw: /* redraw screen */
|
|
reset_display();
|
|
break;
|
|
|
|
case CMD_update: /* merely update display */
|
|
/* is the load average high? */
|
|
if (system_info.load_avg[0] > LoadMax)
|
|
{
|
|
/* yes, go home for visual feedback */
|
|
go_home();
|
|
fflush(stdout);
|
|
}
|
|
break;
|
|
|
|
case CMD_quit: /* quit */
|
|
quit(0);
|
|
/*NOTREACHED*/
|
|
break;
|
|
|
|
case CMD_help1: /* help */
|
|
case CMD_help2:
|
|
reset_display();
|
|
clear();
|
|
show_help();
|
|
standout("Hit any key to continue: ");
|
|
fflush(stdout);
|
|
(void) read(0, &ch, 1);
|
|
break;
|
|
|
|
case CMD_errors: /* show errors */
|
|
if (error_count() == 0)
|
|
{
|
|
new_message(MT_standout,
|
|
" Currently no errors to report.");
|
|
putchar('\r');
|
|
no_command = Yes;
|
|
}
|
|
else
|
|
{
|
|
reset_display();
|
|
clear();
|
|
show_errors();
|
|
standout("Hit any key to continue: ");
|
|
fflush(stdout);
|
|
(void) read(0, &ch, 1);
|
|
}
|
|
break;
|
|
|
|
case CMD_number1: /* new number */
|
|
case CMD_number2:
|
|
new_message(MT_standout,
|
|
"Number of processes to show: ");
|
|
newval = readline(tempbuf1, 8, Yes);
|
|
if (newval > -1)
|
|
{
|
|
if (newval > max_topn)
|
|
{
|
|
new_message(MT_standout | MT_delayed,
|
|
" This terminal can only display %d processes.",
|
|
max_topn);
|
|
putchar('\r');
|
|
}
|
|
|
|
if (newval == 0)
|
|
{
|
|
/* inhibit the header */
|
|
display_header(No);
|
|
}
|
|
else if (newval > topn && topn == 0)
|
|
{
|
|
/* redraw the header */
|
|
display_header(Yes);
|
|
d_header = i_header;
|
|
}
|
|
topn = newval;
|
|
}
|
|
break;
|
|
|
|
case CMD_delay: /* new seconds delay */
|
|
new_message(MT_standout, "Seconds to delay: ");
|
|
if ((i = readline(tempbuf1, 8, Yes)) > -1)
|
|
{
|
|
delay = i;
|
|
}
|
|
clear_message();
|
|
break;
|
|
|
|
case CMD_displays: /* change display count */
|
|
new_message(MT_standout,
|
|
"Displays to show (currently %s): ",
|
|
displays == -1 ? "infinite" :
|
|
itoa(displays));
|
|
if ((i = readline(tempbuf1, 10, Yes)) > 0)
|
|
{
|
|
displays = i;
|
|
}
|
|
else if (i == 0)
|
|
{
|
|
quit(0);
|
|
}
|
|
clear_message();
|
|
break;
|
|
|
|
case CMD_kill: /* kill program */
|
|
new_message(0, "kill ");
|
|
if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
|
|
{
|
|
if ((errmsg = kill_procs(tempbuf2)) != NULL)
|
|
{
|
|
new_message(MT_standout, errmsg);
|
|
putchar('\r');
|
|
no_command = Yes;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
clear_message();
|
|
}
|
|
break;
|
|
|
|
case CMD_renice: /* renice program */
|
|
new_message(0, "renice ");
|
|
if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
|
|
{
|
|
if ((errmsg = renice_procs(tempbuf2)) != NULL)
|
|
{
|
|
new_message(MT_standout, errmsg);
|
|
putchar('\r');
|
|
no_command = Yes;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
clear_message();
|
|
}
|
|
break;
|
|
|
|
case CMD_idletog:
|
|
case CMD_idletog2:
|
|
ps.idle = !ps.idle;
|
|
new_message(MT_standout | MT_delayed,
|
|
" %sisplaying idle processes.",
|
|
ps.idle ? "D" : "Not d");
|
|
putchar('\r');
|
|
break;
|
|
|
|
case CMD_user:
|
|
new_message(MT_standout,
|
|
"Username to show: ");
|
|
if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
|
|
{
|
|
if (tempbuf2[0] == '+' &&
|
|
tempbuf2[1] == '\0')
|
|
{
|
|
ps.uid = -1;
|
|
}
|
|
else if ((i = userid(tempbuf2)) == -1)
|
|
{
|
|
new_message(MT_standout,
|
|
" %s: unknown user", tempbuf2);
|
|
no_command = Yes;
|
|
}
|
|
else
|
|
{
|
|
ps.uid = i;
|
|
}
|
|
putchar('\r');
|
|
}
|
|
else
|
|
{
|
|
clear_message();
|
|
}
|
|
break;
|
|
|
|
#ifdef ORDER
|
|
case CMD_order:
|
|
new_message(MT_standout,
|
|
"Order to sort: ");
|
|
if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
|
|
{
|
|
if ((i = string_index(tempbuf2, statics.order_names)) == -1)
|
|
{
|
|
new_message(MT_standout,
|
|
" %s: unrecognized sorting order", tempbuf2);
|
|
no_command = Yes;
|
|
}
|
|
else
|
|
{
|
|
order_index = i;
|
|
}
|
|
putchar('\r');
|
|
}
|
|
else
|
|
{
|
|
clear_message();
|
|
}
|
|
break;
|
|
#endif
|
|
|
|
default:
|
|
new_message(MT_standout, " BAD CASE IN SWITCH!");
|
|
putchar('\r');
|
|
}
|
|
}
|
|
|
|
/* flush out stuff that may have been written */
|
|
fflush(stdout);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
quit(0);
|
|
/*NOTREACHED*/
|
|
}
|
|
|
|
/*
|
|
* reset_display() - reset all the display routine pointers so that entire
|
|
* screen will get redrawn.
|
|
*/
|
|
|
|
reset_display()
|
|
|
|
{
|
|
d_loadave = i_loadave;
|
|
d_procstates = i_procstates;
|
|
d_cpustates = i_cpustates;
|
|
d_memory = i_memory;
|
|
d_swap = i_swap;
|
|
d_message = i_message;
|
|
d_header = i_header;
|
|
d_process = i_process;
|
|
}
|
|
|
|
/*
|
|
* signal handlers
|
|
*/
|
|
|
|
sigret_t leave() /* exit under normal conditions -- INT handler */
|
|
|
|
{
|
|
end_screen();
|
|
exit(0);
|
|
}
|
|
|
|
sigret_t tstop(i) /* SIGTSTP handler */
|
|
|
|
int i;
|
|
|
|
{
|
|
/* move to the lower left */
|
|
end_screen();
|
|
fflush(stdout);
|
|
|
|
/* default the signal handler action */
|
|
(void) signal(SIGTSTP, SIG_DFL);
|
|
|
|
/* unblock the signal and send ourselves one */
|
|
#ifdef SIGRELSE
|
|
sigrelse(SIGTSTP);
|
|
#else
|
|
(void) sigsetmask(sigblock(0) & ~(1 << (SIGTSTP - 1)));
|
|
#endif
|
|
(void) kill(0, SIGTSTP);
|
|
|
|
/* reset the signal handler */
|
|
(void) signal(SIGTSTP, tstop);
|
|
|
|
/* reinit screen */
|
|
reinit_screen();
|
|
|
|
/* jump to appropriate place */
|
|
longjmp(jmp_int, 1);
|
|
|
|
/*NOTREACHED*/
|
|
}
|
|
|
|
#ifdef SIGWINCH
|
|
sigret_t winch(i) /* SIGWINCH handler */
|
|
|
|
int i;
|
|
|
|
{
|
|
/* reascertain the screen dimensions */
|
|
get_screensize();
|
|
|
|
/* tell display to resize */
|
|
max_topn = display_resize();
|
|
|
|
/* reset the signal handler */
|
|
(void) signal(SIGWINCH, winch);
|
|
|
|
/* jump to appropriate place */
|
|
longjmp(jmp_int, 1);
|
|
}
|
|
#endif
|
|
|
|
void quit(status) /* exit under duress */
|
|
|
|
int status;
|
|
|
|
{
|
|
end_screen();
|
|
exit(status);
|
|
/*NOTREACHED*/
|
|
}
|
|
|
|
sigret_t onalrm() /* SIGALRM handler */
|
|
|
|
{
|
|
/* this is only used in batch mode to break out of the pause() */
|
|
/* return; */
|
|
}
|
|
|