293 lines
6.4 KiB
C
293 lines
6.4 KiB
C
/*-
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* Copyright (c) 2002 Tim J. Robbins.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <errno.h>
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#include <langinfo.h>
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#include <limits.h>
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#include <locale.h>
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#include <paths.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.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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static void heading(void);
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static void process_utmp(FILE *);
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static void quick(FILE *);
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static void row(struct utmp *);
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static int ttywidth(void);
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static void usage(void);
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static void whoami(FILE *);
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static int Hflag; /* Write column headings */
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static int mflag; /* Show info about current terminal */
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static int qflag; /* "Quick" mode */
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static int sflag; /* Show name, line, time */
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static int Tflag; /* Show terminal state */
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static int uflag; /* Show idle time */
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int
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main(int argc, char *argv[])
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{
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int ch;
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const char *file;
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FILE *fp;
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setlocale(LC_TIME, "");
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while ((ch = getopt(argc, argv, "HTabdlmpqrstu")) != -1) {
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switch (ch) {
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case 'H': /* Write column headings */
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Hflag = 1;
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break;
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case 'T': /* Show terminal state */
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Tflag = 1;
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break;
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case 'm': /* Show info about current terminal */
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mflag = 1;
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break;
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case 'q': /* "Quick" mode */
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qflag = 1;
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break;
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case 's': /* Show name, line, time */
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sflag = 1;
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break;
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case 'u': /* Show idle time */
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uflag = 1;
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break;
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default:
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usage();
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/*NOTREACHED*/
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}
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}
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argc -= optind;
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argv += optind;
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if (argc >= 2 && strcmp(argv[0], "am") == 0 &&
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(strcmp(argv[1], "i") == 0 || strcmp(argv[1], "I") == 0)) {
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/* "who am i" or "who am I", equivalent to -m */
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mflag = 1;
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argc -= 2;
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argv += 2;
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}
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if (argc > 1)
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usage();
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if (*argv != NULL)
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file = *argv;
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else
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file = _PATH_UTMP;
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if ((fp = fopen(file, "r")) == NULL)
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err(1, "%s", file);
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if (qflag)
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quick(fp);
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else {
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if (sflag)
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Tflag = uflag = 0;
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if (Hflag)
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heading();
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if (mflag)
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whoami(fp);
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else
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process_utmp(fp);
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}
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fclose(fp);
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exit(0);
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}
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static void
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usage(void)
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{
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fprintf(stderr, "usage: who [-HmqsTu] [am I] [file]\n");
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exit(1);
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}
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static void
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heading(void)
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{
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printf("%-*s ", UT_NAMESIZE, "NAME");
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if (Tflag)
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printf("S ");
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printf("%-*s ", UT_LINESIZE, "LINE");
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printf("%-*s ", 12, "TIME");
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if (uflag)
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printf("IDLE ");
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printf("%-*s", UT_HOSTSIZE, "FROM");
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putchar('\n');
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}
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static void
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row(struct utmp *ut)
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{
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char buf[80], tty[sizeof(_PATH_DEV) + UT_LINESIZE];
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struct stat sb;
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time_t idle;
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static int d_first = -1;
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struct tm *tm;
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char state;
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if (d_first < 0)
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d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
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if (Tflag || uflag) {
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snprintf(tty, sizeof(tty), "%s%.*s", _PATH_DEV,
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UT_LINESIZE, ut->ut_line);
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state = '?';
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idle = 0;
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if (stat(tty, &sb) == 0) {
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state = sb.st_mode & (S_IWOTH|S_IWGRP) ?
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'+' : '-';
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idle = time(NULL) - sb.st_mtime;
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}
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}
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printf("%-*.*s ", UT_NAMESIZE, UT_NAMESIZE, ut->ut_name);
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if (Tflag)
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printf("%c ", state);
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printf("%-*.*s ", UT_LINESIZE, UT_LINESIZE, ut->ut_line);
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tm = localtime(&ut->ut_time);
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strftime(buf, sizeof(buf), d_first ? "%e %b %R" : "%b %e %R", tm);
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printf("%-*s ", 12, buf);
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if (uflag) {
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if (idle < 60)
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printf(" . ");
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else if (idle < 24 * 60 * 60)
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printf("%02d:%02d ", (int)(idle / 60 / 60),
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(int)(idle / 60 % 60));
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else
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printf(" old ");
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}
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if (*ut->ut_host != '\0')
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printf("(%.*s)", UT_HOSTSIZE, ut->ut_host);
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putchar('\n');
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}
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static void
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process_utmp(FILE *fp)
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{
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struct utmp ut;
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while (fread(&ut, sizeof(ut), 1, fp) == 1)
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if (*ut.ut_name != '\0')
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row(&ut);
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}
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static void
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quick(FILE *fp)
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{
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struct utmp ut;
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int col, ncols, num;
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ncols = ttywidth();
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col = num = 0;
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while (fread(&ut, sizeof(ut), 1, fp) == 1) {
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if (*ut.ut_name == '\0')
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continue;
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printf("%-*.*s", UT_NAMESIZE, UT_NAMESIZE, ut.ut_name);
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if (++col < ncols / (UT_NAMESIZE + 1))
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putchar(' ');
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else {
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col = 0;
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putchar('\n');
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}
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num++;
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}
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if (col != 0)
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putchar('\n');
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printf("# users = %d\n", num);
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}
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static void
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whoami(FILE *fp)
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{
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struct utmp ut;
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struct passwd *pwd;
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const char *name, *p, *tty;
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if ((tty = ttyname(STDIN_FILENO)) == NULL)
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tty = "tty??";
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else if ((p = strrchr(tty, '/')) != NULL)
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tty = p + 1;
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/* Search utmp for our tty, dump first matching record. */
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while (fread(&ut, sizeof(ut), 1, fp) == 1)
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if (*ut.ut_name != '\0' && strncmp(ut.ut_line, tty,
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UT_LINESIZE) == 0) {
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row(&ut);
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return;
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}
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/* Not found; fill the utmp structure with the information we have. */
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memset(&ut, 0, sizeof(ut));
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if ((pwd = getpwuid(getuid())) != NULL)
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name = pwd->pw_name;
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else
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name = "?";
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strncpy(ut.ut_name, name, UT_NAMESIZE);
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strncpy(ut.ut_line, tty, UT_LINESIZE);
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time(&ut.ut_time);
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row(&ut);
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}
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static int
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ttywidth(void)
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{
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struct winsize ws;
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long width;
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char *cols, *ep;
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if ((cols = getenv("COLUMNS")) != NULL && *cols != '\0') {
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errno = 0;
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width = strtol(cols, &ep, 10);
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if (errno || width <= 0 || width > INT_MAX || ep == cols ||
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*ep != '\0')
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warnx("invalid COLUMNS environment variable ignored");
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else
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return ((int)cols);
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}
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if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) != -1)
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return (ws.ws_col);
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return (80);
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}
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