2 * Top users/processes display for Unix
4 * This program may be freely redistributed,
5 * but this entire comment MUST remain intact.
7 * Copyright (c) 1984, 1989, William LeFebvre, Rice University
8 * Copyright (c) 1989, 1990, 1992, William LeFebvre, Northwestern University
14 * This file contains the routines that implement some of the interactive
15 * mode commands. Note that some of the commands are implemented in-line
16 * in "main". This is necessary because they change the global state of
17 * "top" (i.e.: changing the number of processes to display).
20 #include <sys/resource.h>
21 #include <sys/signal.h>
36 static int err_compar(const void *p1, const void *p2);
38 struct errs /* structure for a system-call error */
40 int errnum; /* value of errno (that is, the actual error) */
41 char *arg; /* argument that caused the error */
44 static char *err_string(void);
45 static int str_adderr(char *str, int len, int err);
46 static int str_addarg(char *str, int len, char *arg, bool first);
49 * show_help() - display the help screen; invoked in response to
53 const struct command all_commands[] =
55 {'C', "toggle the displaying of weighted CPU percentage", false, CMD_wcputog},
56 {'d', "change number of displays to show", false, CMD_displays},
57 {'e', "list errors generated by last \"kill\" or \"renice\" command", false, CMD_errors},
58 {'H', "toggle the displaying of threads", false, CMD_thrtog},
59 {'h', "show this help text", true, CMD_help},
60 {'?', "show this help text", true, CMD_help},
61 {'i', "toggle the displaying of idle processes", false, CMD_idletog},
62 {'I', "toggle the displaying of idle processes", false, CMD_idletog},
63 {'j', "toggle the displaying of jail ID", false, CMD_jidtog},
64 {'J', "display processes for only one jail (+ selects all jails)", false, CMD_jail},
65 {'k', "kill processes; send a signal to a list of processes", false, CMD_kill},
66 {'q', "quit" , true, CMD_quit},
67 {'m', "toggle the display between 'cpu' and 'io' modes", false, CMD_viewtog},
68 {'n', "change number of processes to display", false, CMD_number},
69 {'#', "change number of processes to display", false, CMD_number},
70 {'o', "specify the sort order", false, CMD_order},
71 {'p', "display one process (+ selects all processes)", false, CMD_pid},
72 {'P', "toggle the displaying of per-CPU statistics", false, CMD_pcputog},
73 {'r', "renice a process", false, CMD_renice},
74 {'s', "change number of seconds to delay between updates", false, CMD_delay},
75 {'S', "toggle the displaying of system processes", false, CMD_viewsys},
76 {'a', "toggle the displaying of process titles", false, CMD_showargs},
77 {'T', "toggle the displaying of thread IDs", false, CMD_toggletid},
78 {'t', "toggle the display of this process", false, CMD_selftog},
79 {'u', "display processes for only one user (+ selects all users)", false, CMD_user},
80 {'w', "toggle the display of swap use for each process", false, CMD_swaptog},
81 {'z', "toggle the displaying of the system idle process", false, CMD_kidletog},
82 {' ', "update the display", false, CMD_update},
83 {0, NULL, true, CMD_NONE}
89 const struct command *curcmd;
91 printf("Top version FreeBSD, %s\n", copyright);
92 curcmd = all_commands;
93 while (curcmd->c != 0) {
94 if (overstrike && !curcmd->available_to_dumb) {
98 printf("%c\t- %s\n", curcmd->c, curcmd->desc);
104 Other commands are also available, but this terminal is not\n\
105 sophisticated enough to handle those commands gracefully.\n", stdout);
110 * Utility routines that help with some of the commands.
114 next_field(char *str)
116 if ((str = strchr(str, ' ')) == NULL)
121 while (*++str == ' ') /* loop */;
123 /* if there is nothing left of the string, return NULL */
124 /* This fix is dedicated to Greg Earle */
125 return(*str == '\0' ? NULL : str);
129 scanint(char *str, int *intp)
134 /* if there is nothing left of the string, flag it as an error */
135 /* This fix is dedicated to Greg Earle */
141 while ((ch = *str++) != '\0')
145 val = val * 10 + (ch - '0');
147 else if (isspace(ch))
161 * Some of the commands make system calls that could generate errors.
162 * These errors are collected up in an array of structures for later
163 * contemplation and display. Such routines return a string containing an
164 * error message, or NULL if no errors occurred. The next few routines are
165 * for manipulating and displaying these errors. We need an upper limit on
166 * the number of errors, so we arbitrarily choose 20.
171 static struct errs errs[ERRMAX];
173 static char err_toomany[] = " too many errors occurred";
174 static char err_listem[] =
175 " Many errors occurred. Press `e' to display the list of errors.";
177 /* These macros get used to reset and log the errors */
178 #define ERR_RESET errcnt = 0
179 #define ERROR(p, e) if (errcnt >= ERRMAX) \
181 return(err_toomany); \
185 errs[errcnt].arg = (p); \
186 errs[errcnt++].errnum = (e); \
190 * err_string() - return an appropriate error string. This is what the
191 * command will return for displaying. If no errors were logged, then
192 * return NULL. The maximum length of the error string is defined by
205 int stringlen; /* characters still available in "string" */
206 static char string[STRMAX];
208 /* if there are no errors, return NULL */
214 /* sort the errors */
215 qsort((char *)errs, errcnt, sizeof(struct errs), err_compar);
217 /* need a space at the front of the error string */
220 stringlen = STRMAX - 2;
222 /* loop thru the sorted list, building an error string */
225 errp = &(errs[cnt++]);
226 if (errp->errnum != currerr)
230 if ((stringlen = str_adderr(string, stringlen, currerr)) < 2)
234 strcat(string, "; "); /* we know there's more */
236 currerr = errp->errnum;
239 if ((stringlen = str_addarg(string, stringlen, errp->arg, first)) ==0)
246 /* add final message */
247 stringlen = str_adderr(string, stringlen, currerr);
249 /* return the error string */
250 return(stringlen == 0 ? err_listem : string);
254 * str_adderr(str, len, err) - add an explanation of error "err" to
259 str_adderr(char *str, int len, int err)
264 msg = err == 0 ? "Not a number" : strerror(err);
265 msglen = strlen(msg) + 2;
272 return(len - msglen);
276 * str_addarg(str, len, arg, first) - add the string argument "arg" to
277 * the string "str". This is the first in the group when "first"
278 * is set (indicating that a comma should NOT be added to the front).
282 str_addarg(char str[], int len, char arg[], bool first)
286 arglen = strlen(arg);
300 return(len - arglen);
304 * err_compar(p1, p2) - comparison routine used by "qsort"
305 * for sorting errors.
309 err_compar(const void *p1, const void *p2)
312 const struct errs * const g1 = (const struct errs * const)p1;
313 const struct errs * const g2 = (const struct errs * const)p2;
317 if ((result = g1->errnum - g2->errnum) == 0)
319 return(strcmp(g1->arg, g2->arg));
325 * error_count() - return the number of errors currently logged.
335 * show_errors() - display on stdout the current log of errors.
342 struct errs *errp = errs;
344 printf("%d error%s:\n\n", errcnt, errcnt == 1 ? "" : "s");
345 while (cnt++ < errcnt)
347 printf("%5s: %s\n", errp->arg,
348 errp->errnum == 0 ? "Not a number" : strerror(errp->errnum));
353 static const char no_proc_specified[] = " no processes specified";
354 static const char invalid_signal_number[] = " invalid_signal_number";
355 static const char bad_signal_name[] = " bad signal name";
356 static const char bad_pri_value[] = " bad priority value";
359 signame_to_signum(const char * sig)
363 if (strncasecmp(sig, "SIG", 3) == 0)
365 for (n = 1; n < sys_nsig; n++) {
366 if (!strcasecmp(sys_signame[n], sig))
373 * kill_procs(str) - send signals to processes, much like the "kill"
374 * command does; invoked in response to 'k'.
378 kill_procs(char *str)
381 int signum = SIGTERM; /* default */
384 /* reset error array */
387 /* skip over leading white space */
388 while (isspace(*str)) str++;
392 /* explicit signal specified */
393 if ((nptr = next_field(str)) == NULL)
395 return(no_proc_specified);
400 scanint(str + 1, &signum);
401 if (signum <= 0 || signum >= NSIG)
403 return(invalid_signal_number);
408 signum = signame_to_signum(str + 1);
410 /* was it ever found */
413 return(bad_signal_name);
416 /* put the new pointer in place */
420 /* loop thru the string, killing processes */
423 if (scanint(str, &procnum) == -1)
429 /* go in for the kill */
430 if (kill(procnum, signum) == -1)
432 /* chalk up an error */
436 } while ((str = next_field(str)) != NULL);
438 /* return appropriate error string */
439 return(err_string());
443 * renice_procs(str) - change the "nice" of processes, much like the
444 * "renice" command does; invoked in response to 'r'.
448 renice_procs(char *str)
456 /* allow for negative priority values */
457 if ((negate = (*str == '-')) != 0)
459 /* move past the minus sign */
463 /* use procnum as a temporary holding place and get the number */
464 procnum = scanint(str, &prio);
466 /* negate if necessary */
472 /* check for validity */
473 if (procnum == -1 || prio < PRIO_MIN || prio > PRIO_MAX)
475 return(bad_pri_value);
478 /* move to the first process number */
479 if ((str = next_field(str)) == NULL)
481 return(no_proc_specified);
484 /* loop thru the process numbers, renicing each one */
487 if (scanint(str, &procnum) == -1)
492 if (setpriority(PRIO_PROCESS, procnum, prio) == -1)
496 } while ((str = next_field(str)) != NULL);
498 /* return appropriate error string */
499 return(err_string());