Usenet 1993 July/InfoMagic USENET CD-ROM July 1993.ISO/sources/unix/volume15/ck

Internet Message Format | 1988-05-30 | 11.1 KB

Subject:  v15i025:  Check mailboxes for new mail
Newsgroups: comp.sources.unix
Sender: sources
Approved: [e-mail]

Submitted-by: Wayne Mesard <[e-mail]>
Posting-number: Volume 15, Issue 25
Archive-name: ck

These programs examine mailbox files and report the sender and subject of
each message contained in the file.  Although there are dozens of similar
programs wandering around UNIX land, many don't work on common system
configurations.  (E.g., from only works if the mailbox lives in
/usr/spool/mail ; buff and rcvalert don't get along well with the SunView
windows; etc.)

#! /bin/sh
# This is a shell archive.  Remove anything before this line, then unpack
# it by saving it into a file and typing "sh file".  To overwrite existing
# files, type "sh file -c".  You can also feed this as standard input via
# unshar, or by typing "sh <file", e.g..  If this archive is complete, you
# will see the following message at the end:
#        "End of shell archive."
# Contents:  Makefile ck.c ck.man ckd.man wsm_types.h
# Wrapped by [e-mail] on Tue May 31 16:20:42 1988
PATH=/bin:/usr/bin:/usr/ucb ; export PATH
if test -f 'Makefile' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'Makefile'\"
else
echo shar: Extracting \"'Makefile'\" \(155 characters\)
sed "s/^X//" >'Makefile' <<'END_OF_FILE'
BIN = ../bin/
CFLAGS = -O
X
all: ck ckd
X
ck: $(BIN)ck
X$(BIN)ck: ck.c
X    $(CC) $(CFLAGS) ck.c -o $(BIN)ck
X
ckd: $(BIN)ckd
X$(BIN)ckd:
X    ln -s $(BIN)ck $(BIN)ckd
END_OF_FILE
if test 155 -ne `wc -c <'Makefile'`; then
    echo shar: \"'Makefile'\" unpacked with wrong size!
fi
# end of 'Makefile'
fi
if test -f 'ck.c' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'ck.c'\"
else
echo shar: Extracting \"'ck.c'\" \(4618 characters\)
sed "s/^X//" >'ck.c' <<'END_OF_FILE'
X/**************************************************************************
X *      ck{,d}: an incoming mail monitor.
X *      Copyright (c) 1988 Wayne Mesard                                   *
X *                                                                        *
X *      This is free software.  It may be reproduced, retransmitted,      *
X *      redistributed and otherwise propogated at will, provided that     *
X *      this notice remains intact and in place.                          *
X *                                                                        *
X *      Direct all bug reports and comments to [e-mail].            *
X *                                                                        *
X **************************************************************************/
X
X
X#include <stdio.h>
X#include <strings.h>
X#include <sys/types.h>
X#include <sys/stat.h>
X#include <ctype.h>
X#include "wsm_types.h"
X
X
main(argc, argv)
int argc;
char *argv[];
X{
X    extern char *getenv();
X    extern int atoi();
X    extern int getppid();    /* For parent check. */
X    int check_box();
X    time_t last_write();
X
X    int i, c;
X    int interval = 120;
X    FILE *out_device = NULL;
X    boolean verbose = false;
X    int ppid;            /* For parent check. */
X
X    char *ptr, mailbox[256];
X    time_t curr, old_mtime;
X
X
X    for (i=0; ++i<argc && argv[i][0]=='-';)
X    switch (argv[i][1]) {
X      case 'v':
X        verbose = true;
X        break;
X      case 'i':
X        interval = atoi(argv[i]+2);
X        break;
X      case 'o':
X            if (out_device != NULL)
X                fclose(out_device);
X            if (i+1<argc)
X        if ((out_device = fopen(argv[++i], "a"))==NULL) {
X            perror(argv[i]+2);
X            exit(-1);
X        }
X            break;
X    }
X
X    mailbox[0] = '\0';
X    if (i<argc)
X    strcpy(mailbox, argv[i]);
X
X    if (mailbox[0] == '\0')
X    if (ptr = getenv("MAIL"))
X        (void) strcpy(mailbox, ptr);
X    else {
X        (void) strcpy(mailbox, getenv("HOME"));
X        (void) strcat(mailbox, "/mailbox");
X    }
X
X    if (!strcmp("ck", argv[0]+strlen(argv[0])-2)) {
X    if ((c=check_box(mailbox, (out_device?out_device:stdout), verbose, false))==0)
X        printf("No new messages.\n");
X    exit(c);
X    }
X
X    ppid = getppid();
X    if (fork())
X    exit(0);
X
X    old_mtime = last_write(mailbox);
X    while(1) {
X    if (old_mtime < (curr=last_write(mailbox))) {
X        old_mtime = curr;
X        (void) check_box(mailbox, (out_device?out_device:stderr), verbose, true);
X    }
X
X    sleep(interval);
X
X    /* Check to see if parent has died (e.g., on logout).
X     * Commit suicide if it has.
X     * There must be a better way to do this! (setpgrp?)
X     */
X    if (kill(ppid, 0))
X        exit(0);
X    }
X}
X
X
X
time_t last_write(fn)
char *fn;
X{
X  struct stat stbuf;
X
X  stat(fn, &stbuf);
X  return((time_t) stbuf.st_mtime);
X}
X
X
X#define BUFSIZE 100
X#define FROM_FIELD_LEN 19
X#define SUBJ_FIELD_LEN 21
X#if (FROM_FIELD_LEN != 19 || SUBJ_FIELD_LEN != 21)
X    HEY! Fix the fprintf() line below.
X#endif
X#if (BUFSIZE != 100)
X    HEY! Fix the fscanf() line below.
X#endif
X
int check_box(fn, out_device, verbose, bell)
char *fn;
XFILE *out_device;
boolean verbose, bell;
X{
X    extern char *ctime();
X    void nonwhitecpy();
X    static char *margin =
X    "+---------------------------------------------+\n";
X    FILE *mbox;
X    char *devname;
X    char s[BUFSIZE], from_field[FROM_FIELD_LEN],
X         subj_field[SUBJ_FIELD_LEN];
X    int headers = 0, readstat = 0;
X    int count = 0;
X
X    if (mbox = fopen(fn, "r")) {
X    while ((readstat=fscanf(mbox, "%100[^\n]", s)) != EOF) {
X        (void) getc(mbox);
X
X        if (headers) {
X        if (readstat==0) {
X            headers = 0;
X            if (count==0)
X            fprintf(out_device, "%c%s",
X                   (bell ? '\007' : '\0'), margin);
X            fprintf(out_device, "|%2d: %-18.18s{}%-20.20s |\n",
X                ++count, from_field, subj_field);
X        }
X        else if (!strncmp(s, "From:", 5))
X            nonwhitecpy(from_field, s+6, FROM_FIELD_LEN);
X
X        else if (!strncmp(s, "Subject:", 8))
X            nonwhitecpy(subj_field, s+9, SUBJ_FIELD_LEN);
X        }
X        else if (!strncmp(s,"\001\001\001\001", 4)) {
X        headers = 1;
X        subj_field[0] = from_field[0] = '\0';
X        }
X    }
X    fclose(mbox);
X    if (count)
X        fprintf(out_device, margin);
X    }
X    else
X    verbose = true;
X
X    if (verbose) {
X    struct stat stbuf;
X
X    if (stat(fn, &stbuf))
X        perror(fn);
X    else
X        fprintf(out_device,
X            "[%s] Size: %d chars.\nLast modified: %s",
X            fn,
X            stbuf.st_size,
X            ctime((long *)&stbuf.st_mtime));
X    return(-1);
X    }
X    return(count);
X
X
X}
X
X
X
void
nonwhitecpy(d, s, dsize)
register char *d, *s;
int dsize;
X{
X    register char *dend = d+dsize;
X    s--;
X    while (isspace(*++s));
X    while ((*d++ = *s++) && (d<dend));
X}
END_OF_FILE
if test 4618 -ne `wc -c <'ck.c'`; then
    echo shar: \"'ck.c'\" unpacked with wrong size!
fi
# end of 'ck.c'
fi
if test -f 'ck.man' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'ck.man'\"
else
echo shar: Extracting \"'ck.man'\" \(3012 characters\)
sed "s/^X//" >'ck.man' <<'END_OF_FILE'
X.TH CK 1L "4 February 1988" " " " "
X
X.SH NAME
ck, ckd - report newly arrived mail
X
X.SH SYNOPSIS
X.B ck
X[
X.B \-v
X]
X[
X.B \-o
X.I outfile
X]
X[
X.I mailbox
X]
X.br
X.B ckd
X[
X.B \-v
X]
X[
X.B \-o
X.I outfile
X]
X[
X.BI \-i interval
X]
X[
X.I mailbox
X]
X
X.SH DESCRIPTION
X.I ck
and
X.I ckd
are, respectively, the command line and daemon versions of a program
to monitor your incoming mail.  They examine mailbox files and report
the sender and subject of each message contained in the file.  If a
mailbox is not specified,
X.I $HOME/mailbox
will be used.  If the user does not have read access to
the mailbox, an attempt will be made to report the size of the
file and when it was last modified.  This allows the user to check
if someone else recently received mail.
X
Although there are dozens of similar programs wandering around UNIX
land, many don't work on common system configurations.  (E.g.,
X.I from
only works if the mailbox lives in
X.BR /usr/spool/mail ";  "
X.I biff
and
X.I rcvalert
don't get along well with the SunView windows; etc.)
X.I ck
and
X.I ckd
contribute to this parochial mass, since currently they only work
with MMDF format files (or more specifically, files in which
each message is separated by a line containing four Control-A's).
But they do try to be more flexible about how they notify the user.
X
X.I ck
reports the status of the mailbox once and exits.
X.I ckd
runs in the background and reports whenever it notices that
the mailbox has been modified.
X.I ckd
terminates automatically when it sees that the process from which it
was invoked has also terminated.  For example, if you run
X.I ckd
from your
X.I .login
file, it will terminate shortly after you logout.
X
X.I ck
normally prints to the standard output, and
X.I ckd
to the standard error.  This can be changed via the
X.B \-o
option described below.
X.I ckd
will try to ring the bell on the output device whenever it
detects new mail.
X
X.SH OPTIONS
X.TP
X.B \-v
After listing the contents of the mailbox, display its size and
time of modification.
X.TP
X.BI \-o " outfile"
Redirect output to the file or device specified by
X.I outfile.
If the file already exists, the output is appended to it.
X.TP
X.BI \-i interval
Check the mailbox every
X.I interval
seconds instead of the default, 120.  This option is only meaningful
in
X.IR ckd .
X
X.SH FILES
X.TP
X.B $HOME/mailbox
default mailbox file to monitor
X
X.SH DIAGNOSTICS
XExit status is -1 if the file specified in the
X.B \-o
option can't be opened.  Otherwise,
X.IR ck 's
exit status is equal to the number of messages found in the
mailbox, and
X.IR ckd 's
is 0.
X
X
X.SH BUGS
Only handles MMDF format files.
X
There should be an option to turn the bell on or off.
X
Ckd should be smarter about reporting changes in the file.  Right
now it announces any change which leaves messages in the file (even
deleting some messages).  A better approach would be to do some
smart-work to see if it looks like new messages were added.
X
X.SH AUTHOR
X
Wayne Mesard, [e-mail]
X
END_OF_FILE
if test 3012 -ne `wc -c <'ck.man'`; then
    echo shar: \"'ck.man'\" unpacked with wrong size!
fi
# end of 'ck.man'
fi
if test -f 'ckd.man' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'ckd.man'\"
else
echo shar: Extracting \"'ckd.man'\" \(14 characters\)
sed "s/^X//" >'ckd.man' <<'END_OF_FILE'
X.so man1/ck.1
END_OF_FILE
if test 14 -ne `wc -c <'ckd.man'`; then
    echo shar: \"'ckd.man'\" unpacked with wrong size!
fi
# end of 'ckd.man'
fi
if test -f 'wsm_types.h' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'wsm_types.h'\"
else
echo shar: Extracting \"'wsm_types.h'\" \(437 characters\)
sed "s/^X//" >'wsm_types.h' <<'END_OF_FILE'
X/**
X ** ADT: LIFO queue of int's
X **/
X
X#ifndef LIFO_Q_SIZE
X#define LIFO_Q_SIZE 20
X#endif
X
typedef struct {
X  int q[LIFO_Q_SIZE];
X  int ptr;
X} lifo;
X
X#define Q_init(QQ) QQ.ptr = 0
X#define Q_pop(QQ) QQ.q[(--QQ.ptr)]
X#define Q_peek(QQ) QQ.q[(QQ.ptr-1)]
X#define Q_push(QQ, DATA) QQ.q[QQ.ptr]=DATA, QQ.ptr=((QQ.ptr+1)%LIFO_Q_SIZE)
X#define Q_size(QQ) QQ.ptr
X
X
X
X/**
X ** ADT: boolean
X **/
X
X#define boolean    short
X#define true    1
X#define false    0
X
X
END_OF_FILE
if test 437 -ne `wc -c <'wsm_types.h'`; then
    echo shar: \"'wsm_types.h'\" unpacked with wrong size!
fi
# end of 'wsm_types.h'
fi
echo shar: End of shell archive.
exit 0