/* $OpenBSD: top.c,v 1.40 2005/06/17 09:40:48 markus Exp $ */ /* * Top users/processes display for Unix * Version 3 * * Copyright (c) 1984, 1989, William LeFebvre, Rice University * Copyright (c) 1989, 1990, 1992, William LeFebvre, Northwestern University * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR OR HIS EMPLOYER BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ const char copyright[] = "Copyright (c) 1984 through 1996, William LeFebvre"; #include #include #include #include #include #include #include #include #include #include #include #include #include /* includes specific to top */ #include "display.h" /* interface to display package */ #include "screen.h" /* interface to screen package */ #include "top.h" #include "top.local.h" #include "boolean.h" #include "machine.h" #include "utils.h" /* Size of the stdio buffer given to stdout */ #define BUFFERSIZE 2048 /* The buffer that stdio will use */ char stdoutbuf[BUFFERSIZE]; extern int overstrike; /* signal handling routines */ static void leave(int); static void onalrm(int); static void tstop(int); static void winch(int); volatile sig_atomic_t leaveflag, tstopflag, winchflag; static void reset_display(void); int rundisplay(void); static int max_topn; /* maximum displayable processes */ extern int (*proc_compares[])(const void *, const void *); int order_index; /* pointers to display routines */ void (*d_loadave)(int, double *) = i_loadave; void (*d_procstates)(int, int *) = i_procstates; void (*d_cpustates)(int64_t *) = i_cpustates; void (*d_memory)(int *) = i_memory; void (*d_message)(void) = i_message; void (*d_header)(char *) = i_header; void (*d_process)(int, char *) = i_process; int displays = 0; /* indicates unspecified */ char do_unames = Yes; struct process_select ps; char dostates = No; char interactive = Maybe; char warnings = 0; double delay = Default_DELAY; char *order_name = NULL; int topn = Default_TOPN; int no_command = Yes; int old_system = No; int show_args = No; #if Default_TOPN == Infinity char topn_specified = No; #endif /* * these defines enumerate the "strchr"s of the commands in * command_chars */ #define CMD_redraw 0 #define CMD_update 1 #define CMD_quit 2 #define CMD_help1 3 #define CMD_help2 4 #define CMD_OSLIMIT 4 /* terminals with OS can only handle commands */ #define CMD_errors 5 /* less than or equal to CMD_OSLIMIT */ #define CMD_number1 6 #define CMD_number2 7 #define CMD_delay 8 #define CMD_displays 9 #define CMD_kill 10 #define CMD_renice 11 #define CMD_idletog 12 #define CMD_idletog2 13 #define CMD_user 14 #define CMD_system 15 #define CMD_order 16 #define CMD_pid 17 #define CMD_command 18 static void usage(void) { extern char *__progname; fprintf(stderr, "usage: %s [-bIinqSu] [-d count] [-o field] [-p pid] [-s time] [-U username] [number]\n", __progname); } static void parseargs(int ac, char **av) { char *endp; int i; while ((i = getopt(ac, av, "SIbinqus:d:p:U:o:")) != -1) { switch (i) { case 'u': /* toggle uid/username display */ do_unames = !do_unames; break; case 'U': /* display only username's processes */ if ((ps.uid = userid(optarg)) == (uid_t)-1) { fprintf(stderr, "%s: unknown user\n", optarg); exit(1); } break; case 'p': { /* display only process id */ unsigned long long num; const char *errstr; num = strtonum(optarg, 0, INT_MAX, &errstr); if (errstr != NULL || !find_pid(num)) { fprintf(stderr, "%s: unknown pid\n", optarg); exit(1); } ps.pid = (pid_t)num; ps.system = Yes; break; } case 'S': /* show system processes */ ps.system = Yes; old_system = Yes; break; case 'I': /* show idle processes */ ps.idle = !ps.idle; break; case 'i': /* go interactive regardless */ interactive = Yes; break; case 'n': /* batch, or non-interactive */ case 'b': interactive = No; break; case 'd': /* number of displays to show */ if ((i = atoiwi(optarg)) != Invalid && i != 0) { displays = i; break; } warnx("warning: display count should be positive " "-- option ignored"); warnings++; break; case 's': delay = strtod(optarg, &endp); if (delay > 0 && delay <= 1000000 && *endp == '\0') break; warnx("warning: delay should be a non-negative number" " -- using default"); delay = Default_DELAY; warnings++; break; case 'q': /* be quick about it */ /* only allow this if user is really root */ if (getuid() == 0) { /* be very un-nice! */ (void) nice(-20); break; } warnx("warning: `-q' option can only be used by root"); warnings++; break; case 'o': /* select sort order */ order_name = optarg; break; default: usage(); exit(1); } } /* get count of top processes to display (if any) */ if (optind < ac) { if ((topn = atoiwi(av[optind])) == Invalid) { warnx("warning: process display count should " "be non-negative -- using default"); warnings++; } #if Default_TOPN == Infinity else topn_specified = Yes; #endif } } struct system_info system_info; struct statics statics; int main(int argc, char *argv[]) { char *uname_field = "USERNAME", *header_text, *env_top; char *(*get_userid)(uid_t) = username, **preset_argv, **av; int preset_argc = 0, ac, active_procs, i; sigset_t mask, oldmask; time_t curr_time; caddr_t processes; /* set the buffer for stdout */ #ifdef DEBUG setbuffer(stdout, NULL, 0); #else setbuffer(stdout, stdoutbuf, sizeof stdoutbuf); #endif /* initialize some selection options */ ps.idle = Yes; ps.system = No; ps.uid = (uid_t)-1; ps.pid = (pid_t)-1; ps.command = NULL; /* get preset options from the environment */ if ((env_top = getenv("TOP")) != NULL) { av = preset_argv = argparse(env_top, &preset_argc); ac = preset_argc; /* * set the dummy argument to an explanatory message, in case * getopt encounters a bad argument */ preset_argv[0] = "while processing environment"; } /* process options */ do { /* * if we're done doing the presets, then process the real * arguments */ if (preset_argc == 0) { ac = argc; av = argv; optind = 1; } parseargs(ac, av); i = preset_argc; preset_argc = 0; } while (i != 0); /* set constants for username/uid display correctly */ if (!do_unames) { uname_field = " UID "; get_userid = format_uid; } /* initialize the kernel memory interface */ if (machine_init(&statics) == -1) exit(1); /* determine sorting order index, if necessary */ if (order_name != NULL) { if ((order_index = string_index(order_name, statics.order_names)) == -1) { char **pp; warnx("'%s' is not a recognized sorting order", order_name); fprintf(stderr, "\tTry one of these:"); pp = statics.order_names; while (*pp != NULL) fprintf(stderr, " %s", *pp++); fputc('\n', stderr); exit(1); } } /* initialize termcap */ init_termcap(interactive); /* get the string to use for the process area header */ header_text = format_header(uname_field); /* initialize display interface */ if ((max_topn = display_init(&statics)) == -1) { warnx("can't allocate sufficient memory"); exit(4); } /* print warning if user requested more processes than we can display */ if (topn > max_topn) { warnx("warning: this terminal can only display %d processes", max_topn); warnings++; } /* adjust for topn == Infinity */ if (topn == Infinity) { /* * For smart terminals, infinity really means everything that can * be displayed, or Largest. * On dumb terminals, infinity means every process in the system! * We only really want to do that if it was explicitly specified. * This is always the case when "Default_TOPN != Infinity". But if * topn wasn't explicitly specified and we are on a dumb terminal * and the default is Infinity, then (and only then) we use * "Nominal_TOPN" instead. */ #if Default_TOPN == Infinity topn = smart_terminal ? Largest : (topn_specified ? Largest : Nominal_TOPN); #else topn = Largest; #endif } /* set header display accordingly */ display_header(topn > 0); /* determine interactive state */ if (interactive == Maybe) interactive = smart_terminal; /* if # of displays not specified, fill it in */ if (displays == 0) displays = smart_terminal ? Infinity : 1; /* * block interrupt signals while setting up the screen and the * handlers */ sigemptyset(&mask); sigaddset(&mask, SIGINT); sigaddset(&mask, SIGQUIT); sigaddset(&mask, SIGTSTP); sigprocmask(SIG_BLOCK, &mask, &oldmask); init_screen(); (void) signal(SIGINT, leave); siginterrupt(SIGINT, 1); (void) signal(SIGQUIT, leave); (void) signal(SIGTSTP, tstop); (void) signal(SIGWINCH, winch); sigprocmask(SIG_SETMASK, &oldmask, NULL); if (warnings) { fputs("....", stderr); fflush(stderr); /* why must I do this? */ sleep((unsigned)(3 * warnings)); fputc('\n', stderr); } restart: /* * main loop -- repeat while display count is positive or while it * indicates infinity (by being -1) */ while ((displays == -1) || (displays-- > 0)) { /* get the current stats */ get_system_info(&system_info); /* get the current set of processes */ processes = get_process_info(&system_info, &ps, proc_compares[order_index]); /* display the load averages */ (*d_loadave)(system_info.last_pid, system_info.load_avg); /* display the current time */ /* this method of getting the time SHOULD be fairly portable */ time(&curr_time); i_timeofday(&curr_time); /* display process state breakdown */ (*d_procstates)(system_info.p_total, system_info.procstates); /* display the cpu state percentage breakdown */ if (dostates) { /* but not the first time */ (*d_cpustates)(system_info.cpustates); } else { /* we'll do it next time */ if (smart_terminal) z_cpustates(); else { if (putchar('\n') == EOF) exit(1); } dostates = Yes; } /* display memory stats */ (*d_memory)(system_info.memory); /* handle message area */ (*d_message)(); /* update the header area */ (*d_header)(header_text); if (topn > 0) { /* determine number of processes to actually display */ /* * this number will be the smallest of: active * processes, number user requested, number current * screen accommodates */ active_procs = system_info.p_active; if (active_procs > topn) active_procs = topn; if (active_procs > max_topn) 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_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) if (rundisplay()) goto restart; } } } quit(0); /* NOTREACHED */ return (0); } int rundisplay(void) { static char tempbuf1[50], tempbuf2[50]; sigset_t mask; char ch, *iptr; int change, i; struct pollfd pfd[1]; uid_t uid; static char command_chars[] = "\f qh?en#sdkriIuSopC"; /* * assume valid command unless told * otherwise */ no_command = No; /* * set up arguments for select with * timeout */ pfd[0].fd = STDIN_FILENO; pfd[0].events = POLLIN; if (leaveflag) { end_screen(); exit(0); } if (tstopflag) { /* 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 */ sigemptyset(&mask); sigaddset(&mask, SIGTSTP); sigprocmask(SIG_UNBLOCK, &mask, NULL); (void) kill(0, SIGTSTP); /* reset the signal handler */ (void) signal(SIGTSTP, tstop); /* reinit screen */ reinit_screen(); reset_display(); tstopflag = 0; return 1; } if (winchflag) { /* * reascertain the screen * dimensions */ get_screensize(); /* tell display to resize */ max_topn = display_resize(); /* reset the signal handler */ (void) signal(SIGWINCH, winch); reset_display(); winchflag = 0; return 1; } /* * wait for either input or the end * of the delay period */ if (poll(pfd, 1, (int)(delay * 1000)) > 0 && !(pfd[0].revents & (POLLERR|POLLHUP|POLLNVAL))) { char *errmsg; ssize_t len; int newval; clear_message(); /* * now read it and convert to * command strchr */ while (1) { len = read(STDIN_FILENO, &ch, 1); if (len == -1 && errno == EINTR) continue; if (len == 0) exit(1); break; } if ((iptr = strchr(command_chars, ch)) == NULL) { /* illegal command */ new_message(MT_standout, " Command not understood"); if (putchar('\r') == EOF) exit(1); no_command = Yes; fflush(stdout); return (0); } change = iptr - command_chars; if (overstrike && change > CMD_OSLIMIT) { /* error */ new_message(MT_standout, " Command cannot be handled by this terminal"); if (putchar('\r') == EOF) exit(1); no_command = Yes; fflush(stdout); return (0); } 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); break; case CMD_help1: /* help */ case CMD_help2: reset_display(); clear(); show_help(); standout("Hit any key to continue: "); fflush(stdout); while (1) { len = read(STDIN_FILENO, &ch, 1); if (len == -1 && errno == EINTR) continue; if (len == 0) exit(1); break; } break; case CMD_errors: /* show errors */ if (error_count() == 0) { new_message(MT_standout, " Currently no errors to report."); if (putchar('\r') == EOF) exit(1); no_command = Yes; } else { reset_display(); clear(); show_errors(); standout("Hit any key to continue: "); fflush(stdout); while (1) { len = read(STDIN_FILENO, &ch, 1); if (len == -1 && errno == EINTR) continue; if (len == 0) exit(1); break; } } 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); if (putchar('\r') == EOF) exit(1); } if (newval == 0) 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 (readline(tempbuf2, sizeof(tempbuf2), No) > 0) { char *endp; double newdelay = strtod(tempbuf2, &endp); if (newdelay >= 0 && newdelay < 1000000 && *endp == '\0') delay = newdelay; } 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, "%s", errmsg); if (putchar('\r') == EOF) exit(1); 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, "%s", errmsg); if (putchar('\r') == EOF) exit(1); 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"); if (putchar('\r') == EOF) exit(1); 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 = (uid_t)-1; } else if ((uid = userid(tempbuf2)) == (uid_t)-1) { new_message(MT_standout, " %s: unknown user", tempbuf2); no_command = Yes; } else ps.uid = uid; if (putchar('\r') == EOF) exit(1); } else clear_message(); break; case CMD_system: ps.system = !ps.system; old_system = ps.system; new_message(MT_standout | MT_delayed, " %sisplaying system processes.", ps.system ? "D" : "Not d"); break; 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; if (putchar('\r') == EOF) exit(1); } else clear_message(); break; case CMD_pid: new_message(MT_standout, "Process ID to show: "); if (readline(tempbuf2, sizeof(tempbuf2), No) > 0) { if (tempbuf2[0] == '+' && tempbuf2[1] == '\0') { ps.pid = (pid_t)-1; ps.system = old_system; } else { unsigned long long num; const char *errstr; num = strtonum(tempbuf2, 0, INT_MAX, &errstr); if (errstr != NULL || !find_pid(num)) { new_message(MT_standout, " %s: unknown pid", tempbuf2); no_command = Yes; } else { if (ps.system == No) old_system = No; ps.pid = (pid_t)num; ps.system = Yes; } } if (putchar('\r') == EOF) exit(1); } else clear_message(); break; case CMD_command: show_args = (show_args == No) ? Yes : No; break; default: new_message(MT_standout, " BAD CASE IN SWITCH!"); if (putchar('\r') == EOF) exit(1); } } /* flush out stuff that may have been written */ fflush(stdout); return 0; } /* * reset_display() - reset all the display routine pointers so that entire * screen will get redrawn. */ static void reset_display(void) { d_loadave = i_loadave; d_procstates = i_procstates; d_cpustates = i_cpustates; d_memory = i_memory; d_message = i_message; d_header = i_header; d_process = i_process; } /* ARGSUSED */ void leave(int signo) { leaveflag = 1; } /* ARGSUSED */ void tstop(int signo) { tstopflag = 1; } /* ARGSUSED */ void winch(int signo) { winchflag = 1; } /* ARGSUSED */ void onalrm(int signo) { } void quit(int ret) { end_screen(); exit(ret); }