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This is write version 2.1 from 8 March 1994. The manual page has been 

converted from preformatted ascii to nroff source.  Leslie's email
address was also updated.
This commit is contained in:
gdr-ftp 1998-04-10 20:03:55 +00:00
parent f91ed7c806
commit b8915c9cd4
3 changed files with 145 additions and 65 deletions
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25
usr.bin/write/README Normal file
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@ -0,0 +1,25 @@
write v2.1 README file.
write v2.1 _requires_ at least GNO v2.0.5 or the multi-user update.
What's changed:
- changed error messages to go to stderr (previously to stdout).
- added several checks on ut_type to insure validation of utmp entry and
not write to entries marked UT_INVISIBLE.
- fixed bug which would have caused problems in an fputs() command iff
the length of the line name was the maximum allowed.
- have it on authority that the CRs appended to the ends of the output
lines will be correctly translated. This was questionable when 2.0 was
sent out.
Special thanks to Phil Vandry again for suggestions - he sent me source after
the MU upgrade, but it got corrupted. He sent me a new copy, and I used it to
modify the new code. Thanks :-)
Please send all requests to:
America On-Line: WDPhoenix (@aol.com)
Delphi: WDPHOENIX (@delphi.com)
US Snail: Les Barstow
275 Route 10 East
Suite 220-136
Succasunna, NJ 07876

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usr.bin/write/write.1 Normal file
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.\" Man page converted from formatted ascii to nroff source by
.\" Devin Reade, 10 April 1998.
.\"
.\" $Id: write.1,v 1.1 1998/04/10 20:03:53 gdr-ftp Exp $
.\"
.TH WRITE 1 "8 March 1994" GNO "Commands and Applications"
.SH NAME
write \- write messages to a user's terminal
.SH SYNOPSIS
.B write
.IR username " [" message ]
.SH DESCRIPTION
.BR write
writes messages to all terminals belonging to
.IR username .
If an optional
.I message
is included on the command line, then that message is the one sent to the
user. If no message is included on the command line,
.BR write
takes input from standard input until a blank line is encountered.
It sends each line of input as it is received.
.SH ERRORS
.BR write
returns in error if the user does not exist or if the user is not
currently signed on. Executing
.BR write
with no arguments or with an option argument returns a usage message.
.SH BUGS
Old versions of the GNO multiuser package are incompatible with this version of
.BR write ;
use
.BR write
version 1.0 if you have not updated the multiuser package.
.SH OTHER
This program is Copyright 1993, 1994 by Leslie M. Barstow III.
It may be distributed freely provided it is accompanied by this manpage.
write uses routines from the ORCA Libraries, Copyright by ByteWorks, Inc.
.SH AUTHOR
Leslie Barstow, <phoenix@faerealm.faerealm.com>.
.SH FILES
/var/adm/utmp

143
usr.bin/write/write.c
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@ -1,11 +1,18 @@
/* write.cc - UNIX-like write utility. Send message to terminal. */
/* Copyright 1993 by Leslie M. Barstow III */
/* Placed in the Public Domain with the following condition:
Please retain original Copyright in source, program, and manpage. */
/* Copyright 1993, 1994 by Leslie M. Barstow III */
/* This program is Freeware: Distribute and modify as you like, but
please retain original Copyright in source, program, and manpage. */
/* v1.0 - original release */
/* v1.1 - 2/2/94 updated for new Multi-User package using wtmp */
/* v2.0 - 2/21/94 fixed several bugs, added date to message. */
/* v2.1 - 3/8/94 changed errors to stderr, fixed some errors, added TZ.
changes taken in part from Phil Vandry's sample code -
Thanks, Phil :-) */
#pragma optimize -1
#pragma debug 0
#pragma stacksize 1024
#pragma stacksize 768
#define O_WRONLY 0x0002
@ -17,26 +24,31 @@
#include <orca.h>
#include <utmp.h>
#include <fcntl.h>
#include <pwd.h>
#include <unistd.h>
#include <texttool.h>
#include <sys/ioctl.h>
void Usage(void)
{fputs("usage: write username [message]\n",stdout);
fputs("GS write: Copyright 1993 by Leslie M. Barstow III.\n", stdout);
fputs("GS write v2.1: Copyright 1994 by Leslie M. Barstow III.\n", stdout);
}
int userTTY(char *user, int **list)
{int fd, tmp;
struct utmp uentry;
static struct utmp uentry;
static char tmpline[UT_LINESIZE+1];
int count = 0;
int *newlist;
fd=open(_PATH_UTMP, 257);
if (fd < 1)
{fputs("write - unable to retrieve current users.\n", stdout);
{fputs("write - unable to retrieve current users.\n", stderr);
exit(-1);
}
do
{tmp = read(fd, (void *)(&uentry), sizeof(uentry));
if (tmp)
{if (!strncmp(uentry.ut_name,user,strlen(user)))
if (tmp && uentry.ut_type && !(uentry.ut_type & UT_INVISIBLE))
{if (!strncmp(uentry.ut_name,user,UT_NAMESIZE))
{count++;
newlist = (int *)realloc(*list, count *2);
if (newlist == (int *)0L)
@ -44,15 +56,17 @@ int userTTY(char *user, int **list)
close((*list)[tmp-1]);
free(*list);
close(fd);
fputs("write - unable to allocate memory.\n", stdout);
fputs("write - unable to allocate memory.\n", stderr);
exit(-1);
}
*list = newlist;
(*list)[count-1] = open(uentry.ut_line, 0x0002);
if ((*list)[count-1] < 1)
{fputs("write - unable to open terminal ",stdout);
fputs(uentry.ut_line, stdout);
fputs(".\n", stdout);
{fputs("write - unable to open terminal ",stderr);
strncpy(tmpline, uentry.ut_line, UT_LINESIZE);
tmpline[UT_LINESIZE] = '\0';
fputs(tmpline, stderr);
fputs(".\n", stderr);
count--;
}
}
@ -68,64 +82,63 @@ int main(int argc, char **argv)
{int count;
int i;
int j = 2;
char *line, *uname;
time_t Time;
char *cTime;
char *uname;
int *fdlist = (int *)0L;
uid_t uid;
int doEcho;
struct passwd *pwent;
static char line [512];
if (argc > 3)
if ((argc < 2) || (argc > 3) || (argv[1][0] == '-'))
{Usage();
exit(-1);
}
uid = getuid();
pwent = getpwuid(uid);
uname = pwent->pw_name;
Time = time(0L);
cTime = ctime(&Time);
count = userTTY(argv[1], &fdlist);
if (count < 1)
{fputs("write - no active terminals for user.\n", stderr);
exit(-1);
}
for (i = 0; i < count; i++)
{write(fdlist[i], "\r\aMessage from ", 15);
write(fdlist[i], uname, strlen(uname));
write(fdlist[i], " at ", 4);
write(fdlist[i], cTime, strlen(cTime));
write(fdlist[i], "\r", 1);
}
/* message on command line - write it and exit */
if (argc == 3)
{count = userTTY(argv[1], &fdlist);
if (count < 1)
{fputs("write - no active terminals for user.\n", stdout);
exit(-1);
{for (i = 0; i < count; i++)
{write(fdlist[i], argv[2], strlen(argv[2]));
write(fdlist[i], "\r", 1);
close(fdlist[i]);
}
exit(0);
}
uname = getenv("user");
for (i = 0; i < count; i++)
{write(fdlist[i], "\n\aMessage from ", 15);
write(fdlist[i], uname, strlen(uname));
write(fdlist[i], ".\r\n", 3);
write(fdlist[i], argv[2], strlen(argv[2]));
write(fdlist[i], "\r\n", 2);
}
for (i = 0; i < count; i++)
close(fdlist[i]);
exit(0);
}
if ((argc == 2) && (argv[1][0] != '-')) /* enter read loop */
{line = (char *)malloc(256);
if (line == (char *)0L)
{fputs("write - error allocating buffer.\n", stdout);
exit(-1);
}
count = userTTY(argv[1], &fdlist);
if (count < 1)
{fputs("write - no active terminals for user.\n", stdout);
free(line);
exit(-1);
}
uname = getenv("user");
for(i = 0; i < count; i++)
{write(fdlist[i], "\n\aMessage from ", 15);
write(fdlist[i], uname, strlen(uname));
write(fdlist[i], ".\r\n", 3);
}
while (j > 1)
{fgets(line, 256, stdin);
j = strlen(line);
for (i = 0; i< count; i++)
write(fdlist[i], line, j);
}
free(line);
for (i = 0; i < count; i++)
close(fdlist[i]);
exit(0);
}
else
{Usage();
exit(-1);
}
/* No message on command line - read from stdin */
while (j = ReadLine(line, 512, '\r', 0))
{for (i = 0; i< count; i++)
{write(fdlist[i], line, j);
write(fdlist[i], "\r", 1);
}
}
for (i = 0; i < count; i++)
write(fdlist[i], "\r<EOT>\r", 7);
free(line);
for (i = 0; i < count; i++)
close(fdlist[i]);
exit(0);
}