6ceeb6902a
time_t. Deal with the possibility that time_t != int32_t. This boils down to this sort of thing: - time(&ut.ut_time); + ut.ut_time = time(NULL); and similar for ctime(3) etc. I've kept it minimal for the stuff that may need to be portable (or 3rd party code), but used Matt's time32 stuff for cases where that isn't as much of a concern. Approved by: re (jhb)
295 lines
6.5 KiB
C
295 lines
6.5 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 <timeconv.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, t;
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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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t = _time32_to_time(ut->ut_time);
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tm = localtime(&t);
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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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ut.ut_time = _time_to_time32(time(NULL));
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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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