top 3.4, with a few changes. Still needs more work.

1 files changed, 511 insertions, 0 deletions

diff --git a/usr.bin/top/commands.c b/usr.bin/top/commands.c
new file mode 100644
index 00000000000..a03c4d7ac89
--- /dev/null
+++ b/usr.bin/top/commands.c
@@ -0,0 +1,511 @@
+/*	$OpenBSD: commands.c,v 1.1 1997/08/14 14:00:20 downsj Exp $	*/
+
+/*
+ *  Top users/processes display for Unix
+ *  Version 3
+ *
+ *  This program may be freely redistributed,
+ *  but this entire comment MUST remain intact.
+ *
+ *  Copyright (c) 1984, 1989, William LeFebvre, Rice University
+ *  Copyright (c) 1989, 1990, 1992, William LeFebvre, Northwestern University
+ */
+
+/*
+ *  This file contains the routines that implement some of the interactive
+ *  mode commands.  Note that some of the commands are implemented in-line
+ *  in "main".  This is necessary because they change the global state of
+ *  "top" (i.e.:  changing the number of processes to display).
+ */
+
+#include "os.h"
+#include <ctype.h>
+#include <signal.h>
+#include <errno.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+
+#include "sigdesc.h"		/* generated automatically */
+#include "boolean.h"
+#include "utils.h"
+
+extern int  errno;
+
+extern char *copyright;
+
+/* imported from screen.c */
+extern int overstrike;
+
+int err_compar();
+char *err_string();
+
+/*
+ *  show_help() - display the help screen; invoked in response to
+ *		either 'h' or '?'.
+ */
+
+show_help()
+
+{
+    printf("Top version %s, %s\n", version_string(), copyright);
+    fputs("\n\n\
+A top users display for Unix\n\
+\n\
+These single-character commands are available:\n\
+\n\
+^L      - redraw screen\n\
+q       - quit\n\
+h or ?  - help; show this text\n", stdout);
+
+    /* not all commands are availalbe with overstrike terminals */
+    if (overstrike)
+    {
+	fputs("\n\
+Other commands are also available, but this terminal is not\n\
+sophisticated enough to handle those commands gracefully.\n\n", stdout);
+    }
+    else
+    {
+	fputs("\
+d       - change number of displays to show\n\
+e       - list errors generated by last \"kill\" or \"renice\" command\n\
+i       - toggle the displaying of idle processes\n\
+I       - same as 'i'\n\
+k       - kill processes; send a signal to a list of processes\n\
+n or #  - change number of processes to display\n", stdout);
+#ifdef ORDER
+	fputs("\
+o       - specify sort order (size, res, cpu, time)\n", stdout);
+#endif
+	fputs("\
+r       - renice a process\n\
+s       - change number of seconds to delay between updates\n\
+u       - display processes for only one user (+ selects all users)\n\
+\n\
+\n", stdout);
+    }
+}
+
+/*
+ *  Utility routines that help with some of the commands.
+ */
+
+char *next_field(str)
+
+register char *str;
+
+{
+    if ((str = strchr(str, ' ')) == NULL)
+    {
+	return(NULL);
+    }
+    *str = '\0';
+    while (*++str == ' ') /* loop */;
+
+    /* if there is nothing left of the string, return NULL */
+    /* This fix is dedicated to Greg Earle */
+    return(*str == '\0' ? NULL : str);
+}
+
+scanint(str, intp)
+
+char *str;
+int  *intp;
+
+{
+    register int val = 0;
+    register char ch;
+
+    /* if there is nothing left of the string, flag it as an error */
+    /* This fix is dedicated to Greg Earle */
+    if (*str == '\0')
+    {
+	return(-1);
+    }
+
+    while ((ch = *str++) != '\0')
+    {
+	if (isdigit(ch))
+	{
+	    val = val * 10 + (ch - '0');
+	}
+	else if (isspace(ch))
+	{
+	    break;
+	}
+	else
+	{
+	    return(-1);
+	}
+    }
+    *intp = val;
+    return(0);
+}
+
+/*
+ *  Some of the commands make system calls that could generate errors.
+ *  These errors are collected up in an array of structures for later
+ *  contemplation and display.  Such routines return a string containing an
+ *  error message, or NULL if no errors occurred.  The next few routines are
+ *  for manipulating and displaying these errors.  We need an upper limit on
+ *  the number of errors, so we arbitrarily choose 20.
+ */
+
+#define ERRMAX 20
+
+struct errs		/* structure for a system-call error */
+{
+    int  errno;		/* value of errno (that is, the actual error) */
+    char *arg;		/* argument that caused the error */
+};
+
+static struct errs errs[ERRMAX];
+static int errcnt;
+static char *err_toomany = " too many errors occurred";
+static char *err_listem = 
+	" Many errors occurred.  Press `e' to display the list of errors.";
+
+/* These macros get used to reset and log the errors */
+#define ERR_RESET   errcnt = 0
+#define ERROR(p, e) if (errcnt >= ERRMAX) \
+		    { \
+			return(err_toomany); \
+		    } \
+		    else \
+		    { \
+			errs[errcnt].arg = (p); \
+			errs[errcnt++].errno = (e); \
+		    }
+
+/*
+ *  err_string() - return an appropriate error string.  This is what the
+ *	command will return for displaying.  If no errors were logged, then
+ *	return NULL.  The maximum length of the error string is defined by
+ *	"STRMAX".
+ */
+
+#define STRMAX 80
+
+char *err_string()
+
+{
+    register struct errs *errp;
+    register int  cnt = 0;
+    register int  first = Yes;
+    register int  currerr = -1;
+    int stringlen;		/* characters still available in "string" */
+    static char string[STRMAX];
+
+    /* if there are no errors, return NULL */
+    if (errcnt == 0)
+    {
+	return(NULL);
+    }
+
+    /* sort the errors */
+    qsort((char *)errs, errcnt, sizeof(struct errs), err_compar);
+
+    /* need a space at the front of the error string */
+    string[0] = ' ';
+    string[1] = '\0';
+    stringlen = STRMAX - 2;
+
+    /* loop thru the sorted list, building an error string */
+    while (cnt < errcnt)
+    {
+	errp = &(errs[cnt++]);
+	if (errp->errno != currerr)
+	{
+	    if (currerr != -1)
+	    {
+		if ((stringlen = str_adderr(string, stringlen, currerr)) < 2)
+		{
+		    return(err_listem);
+		}
+		(void) strcat(string, "; ");	  /* we know there's more */
+	    }
+	    currerr = errp->errno;
+	    first = Yes;
+	}
+	if ((stringlen = str_addarg(string, stringlen, errp->arg, first)) ==0)
+	{
+	    return(err_listem);
+	}
+	first = No;
+    }
+
+    /* add final message */
+    stringlen = str_adderr(string, stringlen, currerr);
+
+    /* return the error string */
+    return(stringlen == 0 ? err_listem : string);
+}
+
+/*
+ *  str_adderr(str, len, err) - add an explanation of error "err" to
+ *	the string "str".
+ */
+
+str_adderr(str, len, err)
+
+char *str;
+int len;
+int err;
+
+{
+    register char *msg;
+    register int  msglen;
+
+    msg = err == 0 ? "Not a number" : errmsg(err);
+    msglen = strlen(msg) + 2;
+    if (len <= msglen)
+    {
+	return(0);
+    }
+    (void) strcat(str, ": ");
+    (void) strcat(str, msg);
+    return(len - msglen);
+}
+
+/*
+ *  str_addarg(str, len, arg, first) - add the string argument "arg" to
+ *	the string "str".  This is the first in the group when "first"
+ *	is set (indicating that a comma should NOT be added to the front).
+ */
+
+str_addarg(str, len, arg, first)
+
+char *str;
+int  len;
+char *arg;
+int  first;
+
+{
+    register int arglen;
+
+    arglen = strlen(arg);
+    if (!first)
+    {
+	arglen += 2;
+    }
+    if (len <= arglen)
+    {
+	return(0);
+    }
+    if (!first)
+    {
+	(void) strcat(str, ", ");
+    }
+    (void) strcat(str, arg);
+    return(len - arglen);
+}
+
+/*
+ *  err_compar(p1, p2) - comparison routine used by "qsort"
+ *	for sorting errors.
+ */
+
+err_compar(p1, p2)
+
+register struct errs *p1, *p2;
+
+{
+    register int result;
+
+    if ((result = p1->errno - p2->errno) == 0)
+    {
+	return(strcmp(p1->arg, p2->arg));
+    }
+    return(result);
+}
+
+/*
+ *  error_count() - return the number of errors currently logged.
+ */
+
+error_count()
+
+{
+    return(errcnt);
+}
+
+/*
+ *  show_errors() - display on stdout the current log of errors.
+ */
+
+show_errors()
+
+{
+    register int cnt = 0;
+    register struct errs *errp = errs;
+
+    printf("%d error%s:\n\n", errcnt, errcnt == 1 ? "" : "s");
+    while (cnt++ < errcnt)
+    {
+	printf("%5s: %s\n", errp->arg,
+	    errp->errno == 0 ? "Not a number" : errmsg(errp->errno));
+	errp++;
+    }
+}
+
+/*
+ *  kill_procs(str) - send signals to processes, much like the "kill"
+ *		command does; invoked in response to 'k'.
+ */
+
+char *kill_procs(str)
+
+char *str;
+
+{
+    register char *nptr;
+    int signum = SIGTERM;	/* default */
+    int procnum;
+    struct sigdesc *sigp;
+    int uid;
+
+    /* reset error array */
+    ERR_RESET;
+
+    /* remember our uid */
+    uid = getuid();
+
+    /* skip over leading white space */
+    while (isspace(*str)) str++;
+
+    if (str[0] == '-')
+    {
+	/* explicit signal specified */
+	if ((nptr = next_field(str)) == NULL)
+	{
+	    return(" kill: no processes specified");
+	}
+
+	if (isdigit(str[1]))
+	{
+	    (void) scanint(str + 1, &signum);
+	    if (signum <= 0 || signum >= NSIG)
+	    {
+		return(" invalid signal number");
+	    }
+	}
+	else 
+	{
+	    /* translate the name into a number */
+	    for (sigp = sigdesc; sigp->name != NULL; sigp++)
+	    {
+		if (strcmp(sigp->name, str + 1) == 0)
+		{
+		    signum = sigp->number;
+		    break;
+		}
+	    }
+
+	    /* was it ever found */
+	    if (sigp->name == NULL)
+	    {
+		return(" bad signal name");
+	    }
+	}
+	/* put the new pointer in place */
+	str = nptr;
+    }
+
+    /* loop thru the string, killing processes */
+    do
+    {
+	if (scanint(str, &procnum) == -1)
+	{
+	    ERROR(str, 0);
+	}
+	else
+	{
+	    /* check process owner if we're not root */
+	    if (uid && (uid != proc_owner(procnum)))
+	    {
+		ERROR(str, EACCES);
+	    }
+	    /* go in for the kill */
+	    else if (kill(procnum, signum) == -1)
+	    {
+		/* chalk up an error */
+		ERROR(str, errno);
+	    }
+	}
+    } while ((str = next_field(str)) != NULL);
+
+    /* return appropriate error string */
+    return(err_string());
+}
+
+/*
+ *  renice_procs(str) - change the "nice" of processes, much like the
+ *		"renice" command does; invoked in response to 'r'.
+ */
+
+char *renice_procs(str)
+
+char *str;
+
+{
+    register char negate;
+    int prio;
+    int procnum;
+    int uid;
+
+    ERR_RESET;
+    uid = getuid();
+
+    /* allow for negative priority values */
+    if ((negate = (*str == '-')) != 0)
+    {
+	/* move past the minus sign */
+	str++;
+    }
+
+    /* use procnum as a temporary holding place and get the number */
+    procnum = scanint(str, &prio);
+
+    /* negate if necessary */
+    if (negate)
+    {
+	prio = -prio;
+    }
+
+#if defined(PRIO_MIN) && defined(PRIO_MAX)
+    /* check for validity */
+    if (procnum == -1 || prio < PRIO_MIN || prio > PRIO_MAX)
+    {
+	return(" bad priority value");
+    }
+#endif
+
+    /* move to the first process number */
+    if ((str = next_field(str)) == NULL)
+    {
+	return(" no processes specified");
+    }
+
+    /* loop thru the process numbers, renicing each one */
+    do
+    {
+	if (scanint(str, &procnum) == -1)
+	{
+	    ERROR(str, 0);
+	}
+
+	/* check process owner if we're not root */
+	else if (uid && (uid != proc_owner(procnum)))
+	{
+	    ERROR(str, EACCES);
+	}
+	else if (setpriority(PRIO_PROCESS, procnum, prio) == -1)
+	{
+	    ERROR(str, errno);
+	}
+    } while ((str = next_field(str)) != NULL);
+
+    /* return appropriate error string */
+    return(err_string());
+}
+