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Annotation of 41BSD/cmd/ucbmail/cc.local.c, revision 1.1

1.1     ! root        1: #
        !             2: 
        !             3: /*
        !             4:  * Mail -- a mail program
        !             5:  *
        !             6:  * Computer Center Unix
        !             7:  *
        !             8:  * Local routines that are installation dependent.
        !             9:  */
        !            10: 
        !            11: #include "rcv.h"
        !            12: 
        !            13: /*
        !            14:  * Locate the user's mailbox file (ie, the place where new, unread
        !            15:  * mail is queued).  At Computer Center, it is in /usr/mail/name.
        !            16:  */
        !            17: 
        !            18: findmail()
        !            19: {
        !            20:        register char *cp;
        !            21: 
        !            22:        cp = copy("/usr/mail/", mailname);
        !            23:        copy(myname, cp);
        !            24: }
        !            25: 
        !            26: /*
        !            27:  * Get rid of the queued mail.
        !            28:  * This is essentially "mail -n > /dev/null &"
        !            29:  */
        !            30: 
        !            31: demail()
        !            32: {
        !            33:        register int p;
        !            34: 
        !            35:        if (uid == 0) {
        !            36:                remove(mailname);
        !            37:                return;
        !            38:        }
        !            39:        if ((p = fork()) != 0)
        !            40:                return;
        !            41:        for (p = 0; p < 15; p++)
        !            42:                 close(p);
        !            43:        open("/dev/null", 2);
        !            44:        dup(0);
        !            45:        dup(0);
        !            46:        for (p = SIGHUP; p <= SIGQUIT; p++)
        !            47:                signal(p, SIG_IGN);
        !            48:        execl(MAIL, "mail", "-n", 0);
        !            49:        perror(MAIL);
        !            50:        exit(1);
        !            51: }
        !            52: 
        !            53: /*
        !            54:  * Get the value of an environment variable.
        !            55:  */
        !            56: 
        !            57: char *
        !            58: getenv(name)
        !            59:        char name[];
        !            60: {
        !            61:        register int t;
        !            62:        static char val[30];
        !            63: 
        !            64:        t = ttyn(2);
        !            65:        hget(t);
        !            66:        if (equal(name, "SHELL"))
        !            67:                return("/bin/csh");
        !            68:        if (!equal(name, "HOME"))
        !            69:                return(NOSTR);
        !            70:        copy(hgethome(), val);
        !            71:        return(val);
        !            72: }
        !            73: 
        !            74: /*
        !            75:  * Mail file lock / unlock.
        !            76:  * Not implemented in this version.
        !            77:  */
        !            78: 
        !            79: lock(name)
        !            80:        char name[];
        !            81: {
        !            82: 
        !            83:        return(0);
        !            84: }
        !            85: 
        !            86: unlock()
        !            87: {
        !            88:        return(0);
        !            89: }
        !            90: 
        !            91: /*
        !            92:  * Discover user login name.
        !            93:  */
        !            94: 
        !            95: username(uid, namebuf)
        !            96:        char namebuf[];
        !            97: {
        !            98: 
        !            99:        return(getname(uid, namebuf));
        !           100: }
        !           101: 
        !           102: /*
        !           103:  * Unix routine to do an "fopen" on file descriptor
        !           104:  * The mode has to be repeated because you can't query its
        !           105:  * status
        !           106:  */
        !           107: 
        !           108: FILE *
        !           109: fdopen(fd, mode)
        !           110: register char *mode;
        !           111: {
        !           112:        extern int errno;
        !           113:        register FILE *iop;
        !           114:        extern FILE *_lastbuf;
        !           115: 
        !           116:        for (iop = _iob; iop->_flag&(_IOREAD|_IOWRT); iop++)
        !           117:                if (iop >= _lastbuf)
        !           118:                        return(NULL);
        !           119:        iop->_cnt = 0;
        !           120:        iop->_file = fd;
        !           121:        if (*mode != 'r') {
        !           122:                iop->_flag |= _IOWRT;
        !           123:                if (*mode == 'a')
        !           124:                        lseek(fd, 0L, 2);
        !           125:        } else
        !           126:                iop->_flag |= _IOREAD;
        !           127:        return(iop);
        !           128: }

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