2 * Top users/processes display for Unix
5 * This program may be freely redistributed,
6 * but this entire comment MUST remain intact.
8 * Copyright (c) 1984, 1989, William LeFebvre, Rice University
9 * Copyright (c) 1989, 1990, 1992, William LeFebvre, Northwestern University
15 * This file contains the routines that implement some of the interactive
16 * mode commands. Note that some of the commands are implemented in-line
17 * in "main". This is necessary because they change the global state of
18 * "top" (i.e.: changing the number of processes to display).
26 #include <sys/resource.h>
28 #include "sigdesc.h" /* generated automatically */
35 extern char *copyright;
37 /* imported from screen.c */
38 extern int overstrike;
44 * show_help() - display the help screen; invoked in response to
51 printf("Top version %s, %s\n", version_string(), copyright);
53 A top users display for Unix\n\
55 These single-character commands are available:\n\
59 h or ? - help; show this text\n", stdout);
61 /* not all commands are availalbe with overstrike terminals */
65 Other commands are also available, but this terminal is not\n\
66 sophisticated enough to handle those commands gracefully.\n\n", stdout);
71 d - change number of displays to show\n\
72 e - list errors generated by last \"kill\" or \"renice\" command\n\
73 i - toggle the displaying of idle processes\n\
74 H - toggle the displaying of threads\n\
76 k - kill processes; send a signal to a list of processes\n\
77 n or # - change number of processes to display\n", stdout);
80 o - specify sort order (pri, size, res, cpu, time)\n", stdout);
83 r - renice a process\n\
84 s - change number of seconds to delay between updates\n\
85 u - display processes for only one user (+ selects all users)\n\
92 * Utility routines that help with some of the commands.
100 if ((str = strchr(str, ' ')) == NULL)
105 while (*++str == ' ') /* loop */;
107 /* if there is nothing left of the string, return NULL */
108 /* This fix is dedicated to Greg Earle */
109 return(*str == '\0' ? NULL : str);
118 register int val = 0;
121 /* if there is nothing left of the string, flag it as an error */
122 /* This fix is dedicated to Greg Earle */
128 while ((ch = *str++) != '\0')
132 val = val * 10 + (ch - '0');
134 else if (isspace(ch))
148 * Some of the commands make system calls that could generate errors.
149 * These errors are collected up in an array of structures for later
150 * contemplation and display. Such routines return a string containing an
151 * error message, or NULL if no errors occurred. The next few routines are
152 * for manipulating and displaying these errors. We need an upper limit on
153 * the number of errors, so we arbitrarily choose 20.
158 struct errs /* structure for a system-call error */
160 int errnum; /* value of errno (that is, the actual error) */
161 char *arg; /* argument that caused the error */
164 static struct errs errs[ERRMAX];
166 static char *err_toomany = " too many errors occurred";
167 static char *err_listem =
168 " Many errors occurred. Press `e' to display the list of errors.";
170 /* These macros get used to reset and log the errors */
171 #define ERR_RESET errcnt = 0
172 #define ERROR(p, e) if (errcnt >= ERRMAX) \
174 return(err_toomany); \
178 errs[errcnt].arg = (p); \
179 errs[errcnt++].errnum = (e); \
183 * err_string() - return an appropriate error string. This is what the
184 * command will return for displaying. If no errors were logged, then
185 * return NULL. The maximum length of the error string is defined by
194 register struct errs *errp;
195 register int cnt = 0;
196 register int first = Yes;
197 register int currerr = -1;
198 int stringlen; /* characters still available in "string" */
199 static char string[STRMAX];
201 /* if there are no errors, return NULL */
207 /* sort the errors */
208 qsort((char *)errs, errcnt, sizeof(struct errs), err_compar);
210 /* need a space at the front of the error string */
213 stringlen = STRMAX - 2;
215 /* loop thru the sorted list, building an error string */
218 errp = &(errs[cnt++]);
219 if (errp->errnum != currerr)
223 if ((stringlen = str_adderr(string, stringlen, currerr)) < 2)
227 (void) strcat(string, "; "); /* we know there's more */
229 currerr = errp->errnum;
232 if ((stringlen = str_addarg(string, stringlen, errp->arg, first)) ==0)
239 /* add final message */
240 stringlen = str_adderr(string, stringlen, currerr);
242 /* return the error string */
243 return(stringlen == 0 ? err_listem : string);
247 * str_adderr(str, len, err) - add an explanation of error "err" to
251 str_adderr(str, len, err)
261 msg = err == 0 ? "Not a number" : errmsg(err);
262 msglen = strlen(msg) + 2;
267 (void) strcat(str, ": ");
268 (void) strcat(str, msg);
269 return(len - msglen);
273 * str_addarg(str, len, arg, first) - add the string argument "arg" to
274 * the string "str". This is the first in the group when "first"
275 * is set (indicating that a comma should NOT be added to the front).
278 str_addarg(str, len, arg, first)
288 arglen = strlen(arg);
299 (void) strcat(str, ", ");
301 (void) strcat(str, arg);
302 return(len - arglen);
306 * err_compar(p1, p2) - comparison routine used by "qsort"
307 * for sorting errors.
312 register struct errs *p1, *p2;
317 if ((result = p1->errnum - p2->errnum) == 0)
319 return(strcmp(p1->arg, p2->arg));
325 * error_count() - return the number of errors currently logged.
335 * show_errors() - display on stdout the current log of errors.
341 register int cnt = 0;
342 register 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" : errmsg(errp->errnum));
354 * kill_procs(str) - send signals to processes, much like the "kill"
355 * command does; invoked in response to 'k'.
358 char *kill_procs(str)
364 int signum = SIGTERM; /* default */
366 struct sigdesc *sigp;
369 /* reset error array */
372 /* remember our uid */
375 /* skip over leading white space */
376 while (isspace(*str)) str++;
380 /* explicit signal specified */
381 if ((nptr = next_field(str)) == NULL)
383 return(" kill: no processes specified");
388 (void) scanint(str + 1, &signum);
389 if (signum <= 0 || signum >= NSIG)
391 return(" invalid signal number");
396 /* translate the name into a number */
397 for (sigp = sigdesc; sigp->name != NULL; sigp++)
399 if (strcmp(sigp->name, str + 1) == 0)
401 signum = sigp->number;
406 /* was it ever found */
407 if (sigp->name == NULL)
409 return(" bad signal name");
412 /* put the new pointer in place */
416 /* loop thru the string, killing processes */
419 if (scanint(str, &procnum) == -1)
425 /* check process owner if we're not root */
426 if (uid && (uid != proc_owner(procnum)))
430 /* go in for the kill */
431 else if (kill(procnum, signum) == -1)
433 /* chalk up an error */
437 } while ((str = next_field(str)) != NULL);
439 /* return appropriate error string */
440 return(err_string());
444 * renice_procs(str) - change the "nice" of processes, much like the
445 * "renice" command does; invoked in response to 'r'.
448 char *renice_procs(str)
453 register char negate;
461 /* allow for negative priority values */
462 if ((negate = (*str == '-')) != 0)
464 /* move past the minus sign */
468 /* use procnum as a temporary holding place and get the number */
469 procnum = scanint(str, &prio);
471 /* negate if necessary */
477 #if defined(PRIO_MIN) && defined(PRIO_MAX)
478 /* check for validity */
479 if (procnum == -1 || prio < PRIO_MIN || prio > PRIO_MAX)
481 return(" bad priority value");
485 /* move to the first process number */
486 if ((str = next_field(str)) == NULL)
488 return(" no processes specified");
491 /* loop thru the process numbers, renicing each one */
494 if (scanint(str, &procnum) == -1)
499 /* check process owner if we're not root */
500 else if (uid && (uid != proc_owner(procnum)))
504 else if (setpriority(PRIO_PROCESS, procnum, prio) == -1)
508 } while ((str = next_field(str)) != NULL);
510 /* return appropriate error string */
511 return(err_string());