add directory study
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gohigh
226
study/linux-travel/MINIX-1.5/1.5/Source/commands/leave.c
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226
study/linux-travel/MINIX-1.5/1.5/Source/commands/leave.c
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/* leave - tell the user when to go home Author: Terrence W. Holm */
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/* Usage: leave [ [+] hhmm ]
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*
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* Author: Terrence W. Holm
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*
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* Revision:
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* Fred van Kempen, MINIX User Group Holland
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* -adapted to MSS
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* -adapted to new utmp database
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* -adapted to POSIX (MINIX 1.5)
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*/
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#include <sys/types.h>
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#include <signal.h>
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#include <time.h>
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#include <utmp.h>
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#include <stdio.h>
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#define Min(a,b) ((a<b) ? a : b)
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#define STRING 80 /* lots of room for an argument */
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#define MIN 60L /* seconds per minute */
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#define HOUR (60L*60L) /* seconds per hour */
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#define HALF_DAY (12L*HOUR) /* seconds per half day */
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#define DAY (24L*HOUR) /* seconds per day */
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/* Set the following to your personal preferences for the
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* time and contents of warnings.
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*/
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#define INTERVALS 13 /* size of intervals[] */
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#define WARNINGS 4 /* size of warnings[] */
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static char *Version = "@(#) LEAVE 1.4 (01/09/90)";
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static int intervals[INTERVALS] = {
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-5 * MIN,
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-1 * MIN,
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0,
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MIN,
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2 * MIN,
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3 * MIN,
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4 * MIN,
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5 * MIN,
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6 * MIN,
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7 * MIN,
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8 * MIN,
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9 * MIN,
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10 * MIN
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};
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static char *warnings[WARNINGS] = {
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"You have to leave within 5 minutes",
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"Just one more minute!",
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"Time to leave!",
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"You're going to be late!" /* for all subsequent warnings */
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};
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#ifdef _BSD
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long timezone;
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#else
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extern long timezone;
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#endif
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extern char *ttyname();
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extern char *cuserid();
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void Usage()
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{
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fprintf(stderr, "Usage: leave [[+]hhmm]\n");
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exit(1);
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}
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void Get_Hour_Min(when, hour, min)
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char *when;
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int *hour;
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int *min;
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{
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int hour_min;
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int just_min = 0;
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switch (sscanf(when, "%d:%d", &hour_min, &just_min)) {
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case 1:
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*hour = hour_min / 100;
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*min = hour_min % 100;
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break;
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case 2:
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*hour = hour_min;
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*min = just_min;
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break;
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default:
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Usage();
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}
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if (hour_min < 0 || just_min < 0 || *min > 59) Usage();
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}
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int Still_Logged_On(user, tty)
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char *user;
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char *tty;
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{
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FILE *f;
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struct utmp login;
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if ((f = fopen(UTMP, "r")) == (FILE *) NULL)
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/* no login/logout records kept */
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return(1);
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while (fread(&login, sizeof(struct utmp), 1, f) == 1) {
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if (!strncmp(login.ut_line, tty, 8))
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if (!strncmp(login.ut_name, user, 8)) {
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fclose(f);
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return(1);
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} else {
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fclose(f);
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return(0);
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}
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}
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fclose(f);
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return(0);
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}
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main(argc, argv)
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int argc;
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char *argv[];
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{
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char when[STRING];
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long now = time((time_t *)0);
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long leave, delta;
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int hour, min;
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int pid, i;
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char *user = cuserid( (char *) NULL);
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char *tty = ttyname(0) + 5;
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/* get the argument string "when" either from stdin, or argv */
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if (argc <= 1) {
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printf("When do you have to leave? ");
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if (fgets(when, STRING, stdin) == NULL || when[0] == '\n') exit(0);
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} else {
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strcpy(when, argv[1]);
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if (argc > 2) strcat(when, argv[2]);
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}
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/* determine the leave time from the current time and "when" */
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if (when[0] == '+') {
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Get_Hour_Min(&when[1], &hour, &min);
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leave = now + hour * HOUR + min * MIN;
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} else {
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/* user entered an absolute time */
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#ifdef _BSD
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timezone = -localtime(&now)->tm_gmtoff;
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#endif
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Get_Hour_Min(&when[0], &hour, &min);
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if (hour >= 1 && hour <= 12) {
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/* 12-hour format: relative to previous midnight or noon */
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leave = now - (now - timezone) % HALF_DAY +
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hour % 12 * HOUR + min * MIN;
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if (leave < now - HOUR)
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leave = leave + HALF_DAY;
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else if (leave < now) {
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printf("That time has already passed!\n");
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exit(1);
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}
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} else if (hour <= 24) {
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/* 24-hour format: relative to previous midnight */
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leave = now - (now - timezone) % DAY +
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hour * HOUR + min * MIN;
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if (leave < now - HOUR)
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leave = leave + DAY;
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else if (leave < now) {
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printf("That time has already passed!\n");
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exit(1);
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}
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} else
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Usage();
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}
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printf("Alarm set for %s", ctime(&leave));
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if ((pid = fork()) == -1) {
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fprintf(stderr, "leave: can not fork\n");
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exit(1);
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}
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if (pid != 0) exit(0);
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/* only the child continues on */
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if (user == NULL || tty == NULL) {
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fprintf(stderr, "leave: Can not determine user and terminal name\n");
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exit(1);
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}
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signal(SIGINT, SIG_IGN);
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signal(SIGQUIT, SIG_IGN);
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signal(SIGTERM, SIG_IGN);
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for (;;) {
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if (!Still_Logged_On(user, tty)) exit(0);
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/* how much longer until the leave time? */
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delta = leave - time((time_t *)0);
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/* which interval are we currently in? */
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for (i = 0; i < INTERVALS; ++i)
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if (delta + intervals[i] > 0) break;
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/* if we are within intervals[0] then print a warning If
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* there are more intervals than messages, then use/
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* warnings[WARNINGS-1] for all subsequent messages. */
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if (i > 0)
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printf("\007%s\n", warnings[i > WARNINGS ? WARNINGS - 1 : i - 1]);
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if (i == INTERVALS) {
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printf("That was the last time I'll tell you. Bye.\n");
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exit(0);
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}
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/* Sleep until the next interval. For long periods, wake up
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* every hour to check if the user is still on (also required
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* because 16 bit ints don't allow long waits). */
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sleep((int) Min(delta + intervals[i], HOUR));
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}
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}
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