w: new usage & fix coding style
Coding style fixed and more readable help output. Signed-off-by: Sami Kerola <kerolasa@iki.fi>
This commit is contained in:
Sami Kerola
parent
922d218e1e
commit
7af14af685
310
w.c
310
w.c
@ -1,20 +1,30 @@
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/* w - show what logged in users are doing. Almost entirely rewritten from
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* scratch by Charles Blake circa June 1996. Some vestigal traces of the
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* original may exist. That was done in 1993 by Larry Greenfield with some
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* fixes by Michael K. Johnson.
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/*
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* w - show what logged in users are doing.
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*
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* Almost entirely rewritten from scratch by Charles Blake circa
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* June 1996. Some vestigal traces of the original may exist.
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* That was done in 1993 by Larry Greenfield with some fixes by
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* Michael K. Johnson.
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*
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* Changes by Albert Cahalan, 2002.
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*/
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#include "proc/devname.h"
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#include "proc/escape.h"
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#include "proc/procps.h"
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#include "proc/readproc.h"
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#include "proc/sysinfo.h"
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#include "proc/version.h"
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#include "proc/whattime.h"
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#include "proc/readproc.h"
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#include "proc/devname.h"
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#include "proc/procps.h"
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#include "proc/sysinfo.h"
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#include "proc/escape.h"
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <getopt.h>
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#include <limits.h>
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#include <locale.h>
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#include <locale.h>
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#include <pwd.h>
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#include <pwd.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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@ -23,12 +33,10 @@
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <pwd.h>
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#include <termios.h>
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#include <time.h>
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#include <unistd.h>
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#include <utmp.h>
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#include <locale.h>
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#include <termios.h>
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static int ignoreuser = 0; /* for '-u' */
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static int oldstyle = 0; /* for '-o' */
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@ -49,15 +57,18 @@ typedef struct utmp utmp_t;
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#define HOSTSZ 40
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/* This routine is careful since some programs leave utmp strings
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* unprintable. Always outputs at least fromlen chars padded with spaces
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* on the right if necessary.
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/*
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* This routine is careful since some programs leave utmp strings
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* unprintable. Always outputs at least 16 chars padded with
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* spaces on the right if necessary.
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*/
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static void print_host(const char *restrict host, int len, const int fromlen) {
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static void print_host(const char *restrict host, int len, const int fromlen)
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{
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const char *last;
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int width = 0;
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if (len > fromlen) len = fromlen;
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if (len > fromlen)
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len = fromlen;
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last = host + len;
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for (; host < last; host++) {
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if (isprint(*host) && *host != ' ') {
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@ -67,51 +78,72 @@ static void print_host(const char *restrict host, int len, const int fromlen) {
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break;
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}
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}
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// space-fill, and a '-' too if needed to ensure the column exists
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/*
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* space-fill, and a '-' too if needed to ensure the
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* column exists
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*/
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while (width++ < fromlen)
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fputc(' ', stdout);
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}
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/***** compact 7 char format for time intervals (belongs in libproc?) */
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static void print_time_ival7(time_t t, int centi_sec, FILE* fout) {
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if((long)t < (long)0){ /* system clock changed? */
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/* compact 7 char format for time intervals (belongs in libproc?) */
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static void print_time_ival7(time_t t, int centi_sec, FILE * fout)
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{
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if ((long)t < (long)0) {
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/* system clock changed? */
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printf(" ? ");
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return;
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}
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if (oldstyle) {
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if (t >= 48*60*60) /* > 2 days */
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if (t >= 48 * 60 * 60)
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/* > 2 days */
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fprintf(fout, " %2ludays", t / (24 * 60 * 60));
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else if (t >= 60*60) /* > 1 hour */
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fprintf(fout, " %2lu:%02u ", t/(60*60), (unsigned) ((t/60)%60));
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else if (t > 60) /* > 1 minute */
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else if (t >= 60 * 60)
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/* > 1 hour */
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fprintf(fout, " %2lu:%02u ", t / (60 * 60),
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(unsigned)((t / 60) % 60));
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else if (t > 60)
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/* > 1 minute */
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fprintf(fout, " %2lu:%02um", t / 60, (unsigned)t % 60);
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else
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fprintf(fout, " ");
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} else {
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if (t >= 48*60*60) /* > 2 days */
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if (t >= 48 * 60 * 60)
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/* 2 days or more */
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fprintf(fout, " %2ludays", t / (24 * 60 * 60));
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else if (t >= 60*60) /* > 1 hour */
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fprintf(fout, " %2lu:%02um", t/(60*60), (unsigned) ((t/60)%60));
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else if (t > 60) /* > 1 minute */
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else if (t >= 60 * 60)
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/* 1 hour or more */
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fprintf(fout, " %2lu:%02um", t / (60 * 60),
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(unsigned)((t / 60) % 60));
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else if (t > 60)
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/* 1 minute or more */
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fprintf(fout, " %2lu:%02u ", t / 60, (unsigned)t % 60);
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else
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fprintf(fout, " %2lu.%02us", t, centi_sec);
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}
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}
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/**** stat the device file to get an idle time */
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static time_t idletime(const char *restrict const tty) {
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/* stat the device file to get an idle time */
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static time_t idletime(const char *restrict const tty)
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{
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struct stat sbuf;
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if (stat(tty, &sbuf) != 0)
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return 0;
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return time(NULL) - sbuf.st_atime;
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}
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/***** 7 character formatted login time */
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static void print_logintime(time_t logt, FILE* fout) {
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char weekday[][4] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" },
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month [][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul",
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"Aug", "Sep", "Oct", "Nov", "Dec" };
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/* 7 character formatted login time */
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static void print_logintime(time_t logt, FILE * fout)
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{
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char weekday[][4] = {
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"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
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};
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char month[][4] = {
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"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug",
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"Sep", "Oct", "Nov", "Dec"
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};
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time_t curt;
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struct tm *logtm, *curtm;
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int today;
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@ -123,22 +155,28 @@ static void print_logintime(time_t logt, FILE* fout) {
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logtm = localtime(&logt);
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if (curt - logt > 12 * 60 * 60 && logtm->tm_yday != today) {
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if (curt - logt > 6 * 24 * 60 * 60)
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fprintf(fout, " %02d%3s%02d", logtm->tm_mday, month[logtm->tm_mon],
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logtm->tm_year % 100);
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fprintf(fout, " %02d%3s%02d", logtm->tm_mday,
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month[logtm->tm_mon], logtm->tm_year % 100);
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else
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fprintf(fout, " %3s%02d ", weekday[logtm->tm_wday], logtm->tm_hour);
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fprintf(fout, " %3s%02d ", weekday[logtm->tm_wday],
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logtm->tm_hour);
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} else {
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fprintf(fout, " %02d:%02d ", logtm->tm_hour, logtm->tm_min);
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}
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}
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/* This function scans the process table accumulating total cpu times for
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* any processes "associated" with this login session. It also searches
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* for the "best" process to report as "(w)hat" the user for that login
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* session is doing currently. This the essential core of 'w'.
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/*
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* This function scans the process table accumulating total cpu
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* times for any processes "associated" with this login session.
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* It also searches for the "best" process to report as "(w)hat"
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* the user for that login session is doing currently. This the
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* essential core of 'w'.
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*/
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static const proc_t *getproc(const utmp_t *restrict const u, const char *restrict const tty, unsigned long long *restrict const jcpu, int *restrict const found_utpid) {
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static const proc_t *getproc(const utmp_t * restrict const u,
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const char *restrict const tty,
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unsigned long long *restrict const jcpu,
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int *restrict const found_utpid)
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{
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int line;
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proc_t **pptr = procs;
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const proc_t *best = NULL;
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@ -148,11 +186,13 @@ static const proc_t *getproc(const utmp_t *restrict const u, const char *restric
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*found_utpid = 0;
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if (!ignoreuser) {
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char buf[UT_NAMESIZE + 1];
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struct passwd *passwd_data; /* pointer to static data */
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/* pointer to static data */
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struct passwd *passwd_data;
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strncpy(buf, u->ut_user, UT_NAMESIZE);
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buf[UT_NAMESIZE] = '\0';
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passwd_data = getpwnam(buf);
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if(!passwd_data) return NULL;
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if (!passwd_data)
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return NULL;
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uid = passwd_data->pw_uid;
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/* OK to have passwd_data go out of scope here */
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}
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@ -164,32 +204,36 @@ static const proc_t *getproc(const utmp_t *restrict const u, const char *restric
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*found_utpid = 1;
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best = tmp;
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}
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if(tmp->tty != line) continue;
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if (tmp->tty != line)
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continue;
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(*jcpu) += tmp->utime + tmp->stime;
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secondbest = tmp;
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/* same time-logic here as for "best" below */
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if (!(secondbest && tmp->start_time <= secondbest->start_time)) {
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secondbest = tmp;
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}
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if(!ignoreuser && uid != tmp->euid && uid != tmp->ruid) continue;
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if(tmp->pgrp != tmp->tpgid) continue;
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if(best && tmp->start_time <= best->start_time) continue;
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if (!ignoreuser && uid != tmp->euid && uid != tmp->ruid)
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continue;
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if (tmp->pgrp != tmp->tpgid)
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continue;
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if (best && tmp->start_time <= best->start_time)
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continue;
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best = tmp;
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}
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return best ? best : secondbest;
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}
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/***** showinfo */
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static void showinfo(utmp_t *u, int formtype, int maxcmd, int from, const int userlen, const int fromlen) {
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static void showinfo(utmp_t * u, int formtype, int maxcmd, int from,
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const int userlen, const int fromlen)
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{
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unsigned long long jcpu;
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int ut_pid_found;
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unsigned i;
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char uname[USERSZ + 1] = "",
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tty[5 + sizeof u->ut_line + 1] = "/dev/";
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char uname[USERSZ + 1] = "", tty[5 + sizeof u->ut_line + 1] = "/dev/";
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const proc_t *best;
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for (i=0; i < sizeof(u->ut_line); i++) /* clean up tty if garbled */
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for (i = 0; i < sizeof(u->ut_line); i++)
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/* clean up tty if garbled */
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if (isalnum(u->ut_line[i]) || (u->ut_line[i] == '/'))
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tty[i + 5] = u->ut_line[i];
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else
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@ -197,34 +241,44 @@ static void showinfo(utmp_t *u, int formtype, int maxcmd, int from, const int us
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best = getproc(u, tty + 5, &jcpu, &ut_pid_found);
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/* just skip if stale utmp entry (i.e. login proc doesn't exist). If there
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* is a desire a cmdline flag could be added to optionally show it with a
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* prefix of (stale) in front of cmd or something like that.
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/*
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* just skip if stale utmp entry (i.e. login proc doesn't
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* exist). If there is a desire a cmdline flag could be
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* added to optionally show it with a prefix of (stale)
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* in front of cmd or something like that.
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*/
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if (!ut_pid_found)
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return;
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strncpy(uname, u->ut_user, USERSZ); /* force NUL term for printf */
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/* force NUL term for printf */
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strncpy(uname, u->ut_user, USERSZ);
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if (formtype) {
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printf("%-*.*s%-9.8s", userlen + 1, userlen, uname, u->ut_line);
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if (from)
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print_host(u->ut_host, sizeof u->ut_host, fromlen);
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print_logintime(u->ut_time, stdout);
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if (*u->ut_line == ':') /* idle unknown for xdm logins */
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if (*u->ut_line == ':')
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/* idle unknown for xdm logins */
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printf(" ?xdm? ");
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else
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print_time_ival7(idletime(tty), 0, stdout);
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print_time_ival7(jcpu/Hertz, (jcpu%Hertz)*(100./Hertz), stdout);
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print_time_ival7(jcpu / Hertz, (jcpu % Hertz) * (100. / Hertz),
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stdout);
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if (best) {
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unsigned long long pcpu = best->utime + best->stime;
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print_time_ival7(pcpu/Hertz, (pcpu%Hertz)*(100./Hertz), stdout);
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print_time_ival7(pcpu / Hertz,
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(pcpu % Hertz) * (100. / Hertz),
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stdout);
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} else
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printf(" ? ");
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} else {
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printf("%-*.*s%-9.8s", userlen+1, userlen, u->ut_user, u->ut_line);
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printf("%-*.*s%-9.8s", userlen + 1, userlen, u->ut_user,
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u->ut_line);
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if (from)
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print_host(u->ut_host, sizeof u->ut_host, fromlen);
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if (*u->ut_line == ':') /* idle unknown for xdm logins */
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if (*u->ut_line == ':')
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/* idle unknown for xdm logins */
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printf(" ?xdm? ");
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else
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print_time_ival7(idletime(tty), 0, stdout);
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@ -240,8 +294,27 @@ static void showinfo(utmp_t *u, int formtype, int maxcmd, int from, const int us
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fputc('\n', stdout);
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}
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/***** main */
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int main(int argc, char **argv) {
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static void __attribute__ ((__noreturn__))
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usage(FILE * out)
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{
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fprintf(out,
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"\nUsage: %s [options]\n"
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"\nOptions:\n", program_invocation_short_name);
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fprintf(out,
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" -h, --no-header do not print header\n"
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" -u, --no-current ignore current process username\n"
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" -s, --short short format\n"
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" -f, --from show remote hostname field\n"
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" -o, --old-style old style output\n"
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" --help display this help text\n"
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" -V, --version display version information and exit\n");
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fprintf(out, "\nFor more information see w(1).\n");
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exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
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}
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int main(int argc, char **argv)
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{
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char *user = NULL, *p;
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utmp_t *u;
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struct winsize win;
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@ -250,30 +323,53 @@ int main(int argc, char **argv) {
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int fromlen = 16;
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char *env_var;
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enum {
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HELP_OPTION = CHAR_MAX + 1
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};
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static const struct option longopts[] = {
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{"no-header", no_argument, NULL, 'h'},
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{"no-current", no_argument, NULL, 'u'},
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{"sort", no_argument, NULL, 's'},
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{"from", no_argument, NULL, 'f'},
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{"old-style", no_argument, NULL, 'o'},
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{"help", no_argument, NULL, HELP_OPTION},
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{"version", no_argument, NULL, 'V'},
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{NULL, 0, NULL, 0}
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};
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#ifndef W_SHOWFROM
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from = 0;
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#endif
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setlocale(LC_ALL, "");
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for (args=0; (ch = getopt(argc, argv, "hlusfVo")) != EOF; args++)
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while ((ch = getopt_long(argc, argv, "hlusfVo", longopts, NULL)) != -1)
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switch (ch) {
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case 'h': header = 0; break;
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case 'l': longform = 1; break;
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case 's': longform = 0; break;
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case 'f': from = !from; break;
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case 'V': display_version(); exit(0);
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case 'u': ignoreuser = 1; break;
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case 'o': oldstyle = 1; break;
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case 'h':
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header = 0;
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break;
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case 'l':
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longform = 1;
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break;
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case 's':
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longform = 0;
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break;
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case 'f':
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from = !from;
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break;
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case 'V':
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display_version();
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exit(0);
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case 'u':
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ignoreuser = 1;
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break;
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case 'o':
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oldstyle = 1;
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break;
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case HELP_OPTION:
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usage(stdout);
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default:
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printf("usage: w -hlsufV [user]\n"
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" -h skip header\n"
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" -l long listing (default)\n"
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" -s short listing\n"
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" -u ignore uid of processes\n"
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" -f toggle FROM field (default %s)\n"
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" -o old-style output\n"
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" -V display version\n", FROM_STRING);
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exit(1);
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usage(stderr);
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}
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if ((argv[optind]))
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@ -283,7 +379,9 @@ int main(int argc, char **argv) {
|
||||
if ((env_var = getenv("PROCPS_USERLEN")) != NULL) {
|
||||
userlen = atoi(env_var);
|
||||
if (userlen < 8 || userlen > USERSZ) {
|
||||
fprintf(stderr, "User length environment PROCPS_USERLEN must be between 8 and %d, ignoring.\n", USERSZ);
|
||||
warnx
|
||||
("User length environment PROCPS_USERLEN must be between 8 and %d, ignoring.\n",
|
||||
USERSZ);
|
||||
userlen = 8;
|
||||
}
|
||||
}
|
||||
@ -291,27 +389,29 @@ int main(int argc, char **argv) {
|
||||
if ((env_var = getenv("PROCPS_FROMLEN")) != NULL) {
|
||||
fromlen = atoi(env_var);
|
||||
if (fromlen < 8 || fromlen > HOSTSZ) {
|
||||
fprintf(stderr, "From length environment PROCPS_FROMLEN must be between 8 and %d, ignoring.\n", HOSTSZ);
|
||||
warnx
|
||||
("From length environment PROCPS_FROMLEN must be between 8 and %d, ignoring.\n",
|
||||
HOSTSZ);
|
||||
fromlen = 16;
|
||||
}
|
||||
}
|
||||
if (ioctl(1, TIOCGWINSZ, &win) != -1 && win.ws_col > 0)
|
||||
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) != -1 && win.ws_col > 0)
|
||||
maxcmd = win.ws_col;
|
||||
else if (p = getenv("COLUMNS"))
|
||||
maxcmd = atoi(p);
|
||||
else
|
||||
maxcmd = 80;
|
||||
if (maxcmd < 71) {
|
||||
fprintf(stderr, "%d column window is too narrow\n", maxcmd);
|
||||
exit(1);
|
||||
}
|
||||
if (maxcmd < 71)
|
||||
errx(EXIT_FAILURE, "%d column window is too narrow", maxcmd);
|
||||
|
||||
maxcmd -= 21 + userlen + (from ? fromlen : 0) + (longform ? 20 : 0);
|
||||
if (maxcmd < 3)
|
||||
fprintf(stderr, "warning: screen width %d suboptimal.\n", win.ws_col);
|
||||
warnx("warning: screen width %d suboptimal", win.ws_col);
|
||||
|
||||
procs = readproctab(PROC_FILLCOM | PROC_FILLUSR | PROC_FILLSTAT);
|
||||
|
||||
if (header) { /* print uptime and headers */
|
||||
if (header) {
|
||||
/* print uptime and headers */
|
||||
print_uptime();
|
||||
printf("%-*s TTY ", userlen, "USER");
|
||||
if (from)
|
||||
@ -327,19 +427,27 @@ int main(int argc, char **argv) {
|
||||
if (user) {
|
||||
for (;;) {
|
||||
u = getutent();
|
||||
if (unlikely(!u)) break;
|
||||
if (u->ut_type != USER_PROCESS) continue;
|
||||
if (!strncmp(u->ut_user, user, USERSZ)) showinfo(u, longform, maxcmd, from, userlen, fromlen);
|
||||
if (unlikely(!u))
|
||||
break;
|
||||
if (u->ut_type != USER_PROCESS)
|
||||
continue;
|
||||
if (!strncmp(u->ut_user, user, USERSZ))
|
||||
showinfo(u, longform, maxcmd, from, userlen,
|
||||
fromlen);
|
||||
}
|
||||
} else {
|
||||
for (;;) {
|
||||
u = getutent();
|
||||
if (unlikely(!u)) break;
|
||||
if (u->ut_type != USER_PROCESS) continue;
|
||||
if (*u->ut_user) showinfo(u, longform, maxcmd, from, userlen, fromlen);
|
||||
if (unlikely(!u))
|
||||
break;
|
||||
if (u->ut_type != USER_PROCESS)
|
||||
continue;
|
||||
if (*u->ut_user)
|
||||
showinfo(u, longform, maxcmd, from, userlen,
|
||||
fromlen);
|
||||
}
|
||||
}
|
||||
endutent();
|
||||
|
||||
return 0;
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user