511 lines
10 KiB
C
511 lines
10 KiB
C
/*
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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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* This file contains the routines that implement some of the interactive
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* mode commands. Note that some of the commands are implemented in-line
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* in "main". This is necessary because they change the global state of
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* "top" (i.e.: changing the number of processes to display).
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*/
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#include "os.h"
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#include <ctype.h>
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#include <signal.h>
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#include <errno.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include "sigdesc.h" /* generated automatically */
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#include "top.h"
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#include "boolean.h"
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#include "utils.h"
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extern int errno;
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extern char *copyright;
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/* imported from screen.c */
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extern int overstrike;
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int err_compar();
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char *err_string();
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/*
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* show_help() - display the help screen; invoked in response to
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* either 'h' or '?'.
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*/
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show_help()
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{
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printf("Top version %s, %s\n", version_string(), copyright);
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fputs("\n\n\
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A top users display for Unix\n\
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\n\
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These single-character commands are available:\n\
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\n\
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^L - redraw screen\n\
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q - quit\n\
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h or ? - help; show this text\n", stdout);
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/* not all commands are availalbe with overstrike terminals */
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if (overstrike)
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{
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fputs("\n\
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Other commands are also available, but this terminal is not\n\
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sophisticated enough to handle those commands gracefully.\n\n", stdout);
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}
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else
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{
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fputs("\
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d - change number of displays to show\n\
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e - list errors generated by last \"kill\" or \"renice\" command\n\
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i - toggle the displaying of idle processes\n\
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I - same as 'i'\n\
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k - kill processes; send a signal to a list of processes\n\
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n or # - change number of processes to display\n", stdout);
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#ifdef ORDER
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fputs("\
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o - specify sort order (pri, size, res, cpu, time)\n", stdout);
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#endif
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fputs("\
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r - renice a process\n\
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s - change number of seconds to delay between updates\n\
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u - display processes for only one user (+ selects all users)\n\
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\n\
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\n", stdout);
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}
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}
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/*
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* Utility routines that help with some of the commands.
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*/
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char *next_field(str)
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register char *str;
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{
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if ((str = strchr(str, ' ')) == NULL)
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{
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return(NULL);
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}
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*str = '\0';
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while (*++str == ' ') /* loop */;
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/* if there is nothing left of the string, return NULL */
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/* This fix is dedicated to Greg Earle */
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return(*str == '\0' ? NULL : str);
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}
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scanint(str, intp)
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char *str;
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int *intp;
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{
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register int val = 0;
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register char ch;
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/* if there is nothing left of the string, flag it as an error */
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/* This fix is dedicated to Greg Earle */
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if (*str == '\0')
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{
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return(-1);
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}
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while ((ch = *str++) != '\0')
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{
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if (isdigit(ch))
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{
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val = val * 10 + (ch - '0');
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}
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else if (isspace(ch))
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{
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break;
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}
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else
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{
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return(-1);
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}
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}
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*intp = val;
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return(0);
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}
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/*
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* Some of the commands make system calls that could generate errors.
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* These errors are collected up in an array of structures for later
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* contemplation and display. Such routines return a string containing an
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* error message, or NULL if no errors occurred. The next few routines are
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* for manipulating and displaying these errors. We need an upper limit on
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* the number of errors, so we arbitrarily choose 20.
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*/
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#define ERRMAX 20
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struct errs /* structure for a system-call error */
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{
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int error; /* value of errno (that is, the actual error) */
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char *arg; /* argument that caused the error */
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};
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static struct errs errs[ERRMAX];
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static int errcnt;
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static char *err_toomany = " too many errors occurred";
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static char *err_listem =
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" Many errors occurred. Press `e' to display the list of errors.";
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/* These macros get used to reset and log the errors */
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#define ERR_RESET errcnt = 0
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#define ERROR(p, e) if (errcnt >= ERRMAX) \
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{ \
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return(err_toomany); \
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} \
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else \
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{ \
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errs[errcnt].arg = (p); \
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errs[errcnt++].error = (e); \
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}
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/*
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* err_string() - return an appropriate error string. This is what the
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* command will return for displaying. If no errors were logged, then
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* return NULL. The maximum length of the error string is defined by
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* "STRMAX".
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*/
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#define STRMAX 80
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char *err_string()
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{
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register struct errs *errp;
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register int cnt = 0;
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register int first = Yes;
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register int currerr = -1;
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int stringlen; /* characters still available in "string" */
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static char string[STRMAX];
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/* if there are no errors, return NULL */
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if (errcnt == 0)
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{
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return(NULL);
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}
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/* sort the errors */
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qsort((char *)errs, errcnt, sizeof(struct errs), err_compar);
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/* need a space at the front of the error string */
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string[0] = ' ';
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string[1] = '\0';
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stringlen = STRMAX - 2;
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/* loop thru the sorted list, building an error string */
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while (cnt < errcnt)
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{
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errp = &(errs[cnt++]);
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if (errp->error != currerr)
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{
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if (currerr != -1)
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{
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if ((stringlen = str_adderr(string, stringlen, currerr)) < 2)
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{
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return(err_listem);
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}
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(void) strcat(string, "; "); /* we know there's more */
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}
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currerr = errp->error;
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first = Yes;
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}
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if ((stringlen = str_addarg(string, stringlen, errp->arg, first)) ==0)
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{
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return(err_listem);
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}
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first = No;
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}
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/* add final message */
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stringlen = str_adderr(string, stringlen, currerr);
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/* return the error string */
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return(stringlen == 0 ? err_listem : string);
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}
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/*
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* str_adderr(str, len, err) - add an explanation of error "err" to
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* the string "str".
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*/
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str_adderr(str, len, err)
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char *str;
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int len;
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int err;
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{
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register char *msg;
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register int msglen;
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msg = err == 0 ? "Not a number" : errmsg(err);
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msglen = strlen(msg) + 2;
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if (len <= msglen)
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{
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return(0);
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}
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(void) strcat(str, ": ");
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(void) strcat(str, msg);
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return(len - msglen);
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}
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/*
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* str_addarg(str, len, arg, first) - add the string argument "arg" to
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* the string "str". This is the first in the group when "first"
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* is set (indicating that a comma should NOT be added to the front).
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*/
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str_addarg(str, len, arg, first)
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char *str;
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int len;
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char *arg;
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int first;
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{
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register int arglen;
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arglen = strlen(arg);
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if (!first)
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{
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arglen += 2;
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}
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if (len <= arglen)
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{
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return(0);
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}
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if (!first)
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{
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(void) strcat(str, ", ");
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}
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(void) strcat(str, arg);
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return(len - arglen);
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}
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/*
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* err_compar(p1, p2) - comparison routine used by "qsort"
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* for sorting errors.
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*/
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err_compar(p1, p2)
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register struct errs *p1, *p2;
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{
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register int result;
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if ((result = p1->error - p2->error) == 0)
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{
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return(strcmp(p1->arg, p2->arg));
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}
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return(result);
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}
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/*
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* error_count() - return the number of errors currently logged.
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*/
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error_count()
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{
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return(errcnt);
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}
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/*
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* show_errors() - display on stdout the current log of errors.
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*/
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show_errors()
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{
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register int cnt = 0;
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register struct errs *errp = errs;
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printf("%d error%s:\n\n", errcnt, errcnt == 1 ? "" : "s");
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while (cnt++ < errcnt)
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{
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printf("%5s: %s\n", errp->arg,
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errp->error == 0 ? "Not a number" : errmsg(errp->error));
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errp++;
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}
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}
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/*
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* kill_procs(str) - send signals to processes, much like the "kill"
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* command does; invoked in response to 'k'.
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*/
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char *kill_procs(str)
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char *str;
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{
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register char *nptr;
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int signum = SIGTERM; /* default */
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int procnum;
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struct sigdesc *sigp;
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int uid;
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/* reset error array */
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ERR_RESET;
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/* remember our uid */
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uid = getuid();
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/* skip over leading white space */
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while (isspace(*str)) str++;
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if (str[0] == '-')
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{
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/* explicit signal specified */
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if ((nptr = next_field(str)) == NULL)
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{
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return(" kill: no processes specified");
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}
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if (isdigit(str[1]))
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{
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(void) scanint(str + 1, &signum);
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if (signum <= 0 || signum >= NSIG)
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{
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return(" invalid signal number");
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}
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}
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else
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{
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/* translate the name into a number */
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for (sigp = sigdesc; sigp->name != NULL; sigp++)
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{
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if (strcmp(sigp->name, str + 1) == 0)
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{
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signum = sigp->number;
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break;
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}
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}
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/* was it ever found */
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if (sigp->name == NULL)
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{
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return(" bad signal name");
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}
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}
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/* put the new pointer in place */
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str = nptr;
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}
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/* loop thru the string, killing processes */
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do
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{
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if (scanint(str, &procnum) == -1)
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{
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ERROR(str, 0);
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}
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else
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{
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/* check process owner if we're not root */
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if (uid && (uid != proc_owner(procnum)))
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{
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ERROR(str, EACCES);
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}
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/* go in for the kill */
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else if (kill(procnum, signum) == -1)
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{
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/* chalk up an error */
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ERROR(str, errno);
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}
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}
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} while ((str = next_field(str)) != NULL);
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/* return appropriate error string */
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return(err_string());
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}
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/*
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* renice_procs(str) - change the "nice" of processes, much like the
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* "renice" command does; invoked in response to 'r'.
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*/
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char *renice_procs(str)
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char *str;
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{
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register char negate;
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int prio;
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int procnum;
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int uid;
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ERR_RESET;
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uid = getuid();
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/* allow for negative priority values */
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if ((negate = (*str == '-')) != 0)
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{
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/* move past the minus sign */
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str++;
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}
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/* use procnum as a temporary holding place and get the number */
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procnum = scanint(str, &prio);
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/* negate if necessary */
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if (negate)
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{
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prio = -prio;
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}
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#if defined(PRIO_MIN) && defined(PRIO_MAX)
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/* check for validity */
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if (procnum == -1 || prio < PRIO_MIN || prio > PRIO_MAX)
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{
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return(" bad priority value");
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}
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#endif
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/* move to the first process number */
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if ((str = next_field(str)) == NULL)
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{
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return(" no processes specified");
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}
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/* loop thru the process numbers, renicing each one */
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do
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{
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if (scanint(str, &procnum) == -1)
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{
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ERROR(str, 0);
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}
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/* check process owner if we're not root */
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else if (uid && (uid != proc_owner(procnum)))
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{
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ERROR(str, EACCES);
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}
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else if (setpriority(PRIO_PROCESS, procnum, prio) == -1)
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{
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ERROR(str, errno);
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}
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} while ((str = next_field(str)) != NULL);
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/* return appropriate error string */
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return(err_string());
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}
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