projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| bebb6839 C |
1 | #include <signal.h> |
| 2 | #include <stdio.h> | |
| 3 | #include <setjmp.h> | |
| 4 | #include <sys/ioctl.h> | |
| 5 | #include <sys/types.h> | |
| 6 | #include <sys/time.h> | |
| 7 | ||
| 8 | #define CTIME 1 | |
| 9 | #define ASCTIME 2 | |
| 10 | #define TZSET 3 | |
| 11 | #define LOCALTIME 4 | |
| 12 | #define GMTIME 5 | |
| 13 | #define OFFTIME 6 | |
| 14 | ||
| 15 | extern struct tm *offtime(); | |
| 16 | ||
| 17 | jmp_buf env; | |
| 18 | char *cp, junk[52]; | |
| 19 | long l, off; | |
| 20 | int timeout(), checkppid(); | |
| 21 | struct tm tmtmp, *tp; | |
| 22 | ||
| 23 | main() | |
| 24 | { | |
| 25 | register int i; | |
| 26 | struct itimerval it; | |
| 27 | u_char c; | |
| 28 | ||
| 29 | signal(SIGPIPE, SIG_DFL); | |
| 30 | for (i = getdtablesize(); --i > 2; ) | |
| 31 | close(i); | |
| 32 | /* | |
| 33 | * Need a timer running while we disassociate from the control terminal | |
| 34 | * in case of a modem line which has lost carrier. | |
| 35 | */ | |
| 36 | timerclear(&it.it_interval); | |
| 37 | it.it_value.tv_sec = 5; | |
| 38 | it.it_value.tv_usec = 0; | |
| 39 | signal(SIGALRM, timeout); | |
| 40 | setitimer(ITIMER_REAL, &it, (struct itimerval *) NULL); | |
| 41 | if (setjmp(env) == 0) | |
| 42 | { | |
| 43 | i = open("/dev/tty", 0); | |
| 44 | if (i >= 0) | |
| 45 | { | |
| 46 | ioctl(i, TIOCNOTTY, NULL); | |
| 47 | close(i); | |
| 48 | } | |
| 49 | } | |
| 50 | /* | |
| 51 | * Now start a timer with one minute refresh. In the signal service | |
| 52 | * routine, check the parent process id to see if this process has | |
| 53 | * been orphaned and if so exit. This is primarily aimed at removing | |
| 54 | * the 'ctimed' process left behind by 'sendmail's multi-fork startup | |
| 55 | * but may prove useful in preventing accumulation of 'ctimed' processes | |
| 56 | * in other circumstances as well. Normally this process is short | |
| 57 | * lived. | |
| 58 | */ | |
| 59 | it.it_interval.tv_sec = 60; | |
| 60 | it.it_interval.tv_usec = 0; | |
| 61 | it.it_value.tv_sec = 60; | |
| 62 | it.it_value.tv_usec = 0; | |
| 63 | signal(SIGALRM, checkppid); | |
| 64 | setitimer(ITIMER_REAL, &it, (struct itimerval *) NULL); | |
| 65 | ||
| 66 | while (read(fileno(stdin), &c, 1) == 1) | |
| 67 | { | |
| 68 | switch (c) | |
| 69 | { | |
| 70 | case CTIME: | |
| 71 | l = 0L; | |
| 72 | getb(fileno(stdin), &l, sizeof l); | |
| 73 | cp = ctime(&l); | |
| 74 | write(fileno(stdout), cp, 26); | |
| 75 | break; | |
| 76 | case ASCTIME: | |
| 77 | getb(fileno(stdin), &tmtmp, sizeof tmtmp); | |
| 78 | cp = asctime(&tmtmp); | |
| 79 | write(fileno(stdout), cp, 26); | |
| 80 | break; | |
| 81 | case TZSET: | |
| 82 | (void) tzset(); | |
| 83 | break; | |
| 84 | case LOCALTIME: | |
| 85 | l = 0L; | |
| 86 | getb(fileno(stdin), &l, sizeof l); | |
| 87 | tp = localtime(&l); | |
| 88 | write(fileno(stdout), tp, sizeof (*tp)); | |
| 89 | strcpy(junk, tp->tm_zone); | |
| 90 | junk[24] = '\0'; | |
| 91 | write(fileno(stdout), junk, 24); | |
| 92 | break; | |
| 93 | case GMTIME: | |
| 94 | l = 0L; | |
| 95 | getb(fileno(stdin), &l, sizeof l); | |
| 96 | tp = gmtime(&l); | |
| 97 | write(fileno(stdout), tp, sizeof (*tp)); | |
| 98 | strcpy(junk, tp->tm_zone); | |
| 99 | junk[24] = '\0'; | |
| 100 | write(fileno(stdout), junk, 24); | |
| 101 | break; | |
| 102 | case OFFTIME: | |
| 103 | getb(fileno(stdin), &l, sizeof l); | |
| 104 | getb(fileno(stdin), &off, sizeof off); | |
| 105 | tp = offtime(&l, off); | |
| 106 | write(fileno(stdout), tp, sizeof (*tp)); | |
| 107 | break; | |
| 108 | default: | |
| 109 | abort("switch"); | |
| 110 | } | |
| 111 | } | |
| 112 | } | |
| 113 | ||
| 114 | getb(f, p, n) | |
| 115 | int f; | |
| 116 | register char *p; | |
| 117 | register int n; | |
| 118 | { | |
| 119 | register int i; | |
| 120 | ||
| 121 | while (n) | |
| 122 | { | |
| 123 | i = read(f, p, n); | |
| 124 | if (i <= 0) | |
| 125 | return; | |
| 126 | p += i; | |
| 127 | n -= i; | |
| 128 | } | |
| 129 | } | |
| 130 | ||
| 131 | timeout() | |
| 132 | { | |
| 133 | ||
| 134 | longjmp(env, 1); | |
| 135 | } | |
| 136 | ||
| 137 | checkppid() | |
| 138 | { | |
| 139 | ||
| 140 | if (getppid() == 1) | |
| 141 | exit(0); | |
| 142 | } |