/* w - show what logged in users are doing. Almost entirely rewritten from * scratch by Charles Blake circa June 1996. Some vestigal traces of the * original may exist. That was done in 1993 by Larry Greenfield with some * fixes by Michael K. Johnson. */ #include "proc/version.h" #include "proc/whattime.h" #include "proc/readproc.h" #include "proc/devname.h" #include "proc/procps.h" #include "proc/sysinfo.h" #include #include #include #include #include #include #include #include #include #include #include #include /* #include */ /* for HZ */ int ignoreuser = 0; /* for '-u' */ proc_t **procs; /* our snapshot of the process table */ typedef struct utmp utmp_t; #ifdef W_SHOWFROM # define FROM_STRING "on" #else # define FROM_STRING "off" #endif #define USERSZ (sizeof u->ut_user) /* This routine is careful since some programs leave utmp strings * unprintable. Always outputs at least 16 chars padded with spaces * on the right if necessary. */ static void print_host(char* host, int len) { char *last; int width = 0; /* FIXME: there should really be a way to configure this... */ /* for now, we'll just limit it to the 16 that the libc5 version * of utmp uses. */ if (len > 16) len = 16; last = host + len; for ( ; host < last ; host++){ if (isprint(*host) && *host != ' ') { fputc(*host, stdout); ++width; } else { break; } } if(!width){ /* blank fields screw up parsers */ fputc('-', stdout); ++width; } /* if *any* unprintables(or blanks), replace rest of line with spaces */ while (width < 16) { fputc(' ', stdout); ++width; } } /***** compact 7 char format for time intervals (belongs in libproc?) */ static void print_time_ival7(time_t t, int centi_sec, FILE* fout) { if((long)t < (long)0){ /* system clock changed? */ printf(" ? "); return; } if (t >= 48*60*60) /* > 2 days */ fprintf(fout, " %2ludays", t/(24*60*60)); else if (t >= 60*60) /* > 1 hour */ fprintf(fout, " %2lu:%02um", t/(60*60), (unsigned) ((t/60)%60)); else if (t > 60) /* > 1 minute */ fprintf(fout, " %2lu:%02u ", t/60, (unsigned) t%60); else fprintf(fout, " %2lu.%02us", t, centi_sec); } /**** stat the device file to get an idle time */ static time_t idletime(utmp_t *u, char *tty) { struct stat terminfo; time_t idle_secs; double uptime_secs; if (stat(tty, &terminfo) != 0) return 0; idle_secs = time(NULL) - terminfo.st_atime; uptime (&uptime_secs, NULL); if ((time_t) uptime_secs < idle_secs) idle_secs = (time_t) uptime_secs; return idle_secs; } /***** 7 character formatted login time */ static void print_logintime(time_t logt, FILE* fout) { char *weekday[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" }, *month [] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }; time_t curt; struct tm *logtm, *curtm; int hour; char *merid; /* meridian indicator */ int today; curt = time(NULL); curtm = localtime(&curt); /* localtime returns a pointer to static memory */ today = curtm->tm_yday; logtm = localtime(&logt); hour = logtm->tm_hour; merid = (hour < 12) ? "am" : "pm"; if (hour >= 12) hour -= 12; if (hour == 0) hour = 12; if (curt - logt > 12*60*60 && logtm->tm_yday != today) { if (curt - logt > 6*24*60*60) fprintf(fout, " %2d%3s%02d", logtm->tm_mday, month[logtm->tm_mon], logtm->tm_year % 100); else fprintf(fout, " %3s%2d%s", weekday[logtm->tm_wday], hour, merid); } else { fprintf(fout, " %2d:%02d%s", hour, logtm->tm_min, merid); } } /* This function scans the process table accumulating total cpu times for * any processes "associated" with this login session. It also searches * for the "best" process to report as "(w)hat" the user for that login * session is doing currently. This the essential core of 'w'. */ static proc_t *getproc(utmp_t *u, char *tty, int *jcpu, int *found_utpid) { int line; proc_t **p, *best = NULL, *secondbest = NULL; line = tty_to_dev(tty); *jcpu = *found_utpid = 0; for (p = procs; *p; p++) { if ((**p).pid == u->ut_pid) *found_utpid = 1; if ((**p).tty == line) { (*jcpu) += (**p).utime + (**p).stime; secondbest=*p; if ((ignoreuser || !strncmp((**p).euser, u->ut_user, USERSZ)) && ((**p).pid == (**p).tpgid && (!best || (**p).pid > best->pid))) best = *p; } } if (!best) {return secondbest;} return best; } /***** showinfo */ static void showinfo(utmp_t *u, int formtype, int maxcmd, int from) { int jcpu, i, ut_pid_found; char uname[USERSZ + 1] = "", tty[5 + sizeof u->ut_line + 1] = "/dev/"; proc_t *best; for (i=0; i < sizeof u->ut_line; i++) /* clean up tty if garbled */ if (isalnum(u->ut_line[i]) || (u->ut_line[i]=='/')) tty[i+5] = u->ut_line[i]; else tty[i+5] = '\0'; best = getproc(u, tty + 5, &jcpu, &ut_pid_found); /* just skip if stale utmp entry (i.e. login proc doesn't exist). If there * is a desire a cmdline flag could be added to optionally show it with a * prefix of (stale) in front of cmd or something like that. */ if (!ut_pid_found) return; strncpy(uname, u->ut_user, USERSZ); /* force NUL term for printf */ if (formtype) { printf("%-9.8s%-9.8s", uname, u->ut_line); if (from) print_host(u->ut_host, sizeof u->ut_host); print_logintime(u->ut_time, stdout); if (*u->ut_line == ':') /* idle unknown for xdm logins */ printf(" ? "); else print_time_ival7(idletime(u, tty), 0, stdout); print_time_ival7(jcpu/Hertz, (jcpu%Hertz)*(100./Hertz), stdout); if (best) { int pcpu = best->utime + best->stime; print_time_ival7(pcpu/Hertz, (pcpu%Hertz)*(100./Hertz), stdout); } else printf(" ? "); } else { printf("%-9.8s%-9.8s", u->ut_user, u->ut_line); if (from) print_host(u->ut_host, sizeof u->ut_host); if (*u->ut_line == ':') /* idle unknown for xdm logins */ printf(" ? "); else print_time_ival7(idletime(u, tty), 0, stdout); } fputs(" ", stdout); if (best) { if (best->cmdline) print_strlist(stdout, best->cmdline, " ", maxcmd); else printf("%*.*s", -maxcmd, maxcmd, best->cmd); } else { printf("-"); } fputc('\n', stdout); } /***** main */ int main(int argc, char **argv) { char *user = NULL; utmp_t *u; struct winsize win; int header=1, longform=1, from=1, args, maxcmd=80, ch; #ifndef W_SHOWFROM from = 0; #endif for (args=0; (ch = getopt(argc, argv, "hlusfV")) != EOF; args++) switch (ch) { case 'h': header = 0; break; case 'l': longform = 1; break; case 's': longform = 0; break; case 'f': from = !from; break; case 'V': display_version(); exit(0); case 'u': ignoreuser = 1; break; default: printf("usage: w -hlsufV [user]\n" " -h skip header\n" " -l long listing (default)\n" " -s short listing\n" " -u ignore uid of processes\n" " -f toggle FROM field (default %s)\n" " -V display version\n", FROM_STRING); exit(1); } if ((argv[optind])) user = (argv[optind]); if (ioctl(1, TIOCGWINSZ, &win) != -1 && win.ws_col > 0) maxcmd = win.ws_col; if (maxcmd < 71) { fprintf(stderr, "%d column window is too narrow\n", maxcmd); exit(1); } maxcmd -= 29 + (from ? 16 : 0) + (longform ? 20 : 0); if (maxcmd < 3) fprintf(stderr, "warning: screen width %d suboptimal.\n", win.ws_col); procs = readproctab(PROC_FILLCMD | PROC_FILLUSR); if (header) { /* print uptime and headers */ print_uptime(); printf("USER TTY "); if (from) printf("FROM "); if (longform) printf(" LOGIN@ IDLE JCPU PCPU WHAT\n"); else printf(" IDLE WHAT\n"); } utmpname(UTMP_FILE); setutent(); while ((u=getutent())) { if (u->ut_type == USER_PROCESS && (user ? !strncmp(u->ut_user, user, USERSZ) : *u->ut_user)) showinfo(u, longform, maxcmd, from); } endutent(); return 0; }
