ttymsg.c (7111b0acefc667e94cbfbcfc422e74791a80acbd) ttymsg.c (6a20d55a591484ce93ad7002606c9ca4dbbd7ebb)
1/*
2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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54/*
55 * Display the contents of a uio structure on a terminal. Used by wall(1),
56 * syslogd(8), and talkd(8). Forks and finishes in child if write would block,
57 * waiting up to tmout seconds. Returns pointer to error string on unexpected
58 * error; string is not newline-terminated. Various "normal" errors are
59 * ignored (exclusive-use, lack of permission, etc.).
60 */
61char *
1/*
2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

--- 45 unchanged lines hidden (view full) ---

54/*
55 * Display the contents of a uio structure on a terminal. Used by wall(1),
56 * syslogd(8), and talkd(8). Forks and finishes in child if write would block,
57 * waiting up to tmout seconds. Returns pointer to error string on unexpected
58 * error; string is not newline-terminated. Various "normal" errors are
59 * ignored (exclusive-use, lack of permission, etc.).
60 */
61char *
62ttymsg(iov, iovcnt, line, tmout)
63 struct iovec *iov;
64 int iovcnt;
65 char *line;
66 int tmout;
62ttymsg(struct iovec *iov, int iovcnt, const char *line, int tmout)
67{
63{
64 struct iovec localiov[7];
65 int cnt, fd, left, wret;
68 static char device[MAXNAMLEN] = _PATH_DEV;
69 static char errbuf[1024];
66 static char device[MAXNAMLEN] = _PATH_DEV;
67 static char errbuf[1024];
70 register int cnt, fd, left, wret;
71 struct iovec localiov[7];
72 int forked = 0;
68 int forked;
73
69
70 forked = 0;
74 if (iovcnt > sizeof(localiov) / sizeof(localiov[0]))
75 return ("too many iov's (change code in wall/ttymsg.c)");
76
71 if (iovcnt > sizeof(localiov) / sizeof(localiov[0]))
72 return ("too many iov's (change code in wall/ttymsg.c)");
73
77 (void) strcpy(device + sizeof(_PATH_DEV) - 1, line);
74 strlcat(device, line, sizeof(device));
78 if (strchr(device + sizeof(_PATH_DEV) - 1, '/')) {
79 /* A slash is an attempt to break security... */
75 if (strchr(device + sizeof(_PATH_DEV) - 1, '/')) {
76 /* A slash is an attempt to break security... */
80 (void) snprintf(errbuf, sizeof(errbuf), "'/' in \"%s\"",
81 device);
77 (void) snprintf(errbuf, sizeof(errbuf),
78 "Too many '/' in \"%s\"", device);
82 return (errbuf);
83 }
84
85 /*
86 * open will fail on slip lines or exclusive-use lines
87 * if not running as root; not an error.
88 */
89 if ((fd = open(device, O_WRONLY|O_NONBLOCK, 0)) < 0) {
90 if (errno == EBUSY || errno == EACCES)
91 return (NULL);
79 return (errbuf);
80 }
81
82 /*
83 * open will fail on slip lines or exclusive-use lines
84 * if not running as root; not an error.
85 */
86 if ((fd = open(device, O_WRONLY|O_NONBLOCK, 0)) < 0) {
87 if (errno == EBUSY || errno == EACCES)
88 return (NULL);
92 (void) snprintf(errbuf, sizeof(errbuf),
93 "%s: %s", device, strerror(errno));
89 (void) snprintf(errbuf, sizeof(errbuf), "%s: %s", device,
90 strerror(errno));
94 return (errbuf);
95 }
96
97 for (cnt = left = 0; cnt < iovcnt; ++cnt)
98 left += iov[cnt].iov_len;
99
100 for (;;) {
101 wret = writev(fd, iov, iovcnt);
102 if (wret >= left)
103 break;
104 if (wret >= 0) {
105 left -= wret;
106 if (iov != localiov) {
91 return (errbuf);
92 }
93
94 for (cnt = left = 0; cnt < iovcnt; ++cnt)
95 left += iov[cnt].iov_len;
96
97 for (;;) {
98 wret = writev(fd, iov, iovcnt);
99 if (wret >= left)
100 break;
101 if (wret >= 0) {
102 left -= wret;
103 if (iov != localiov) {
107 bcopy(iov, localiov,
104 bcopy(iov, localiov,
108 iovcnt * sizeof(struct iovec));
109 iov = localiov;
110 }
111 for (cnt = 0; wret >= iov->iov_len; ++cnt) {
112 wret -= iov->iov_len;
113 ++iov;
114 --iovcnt;
115 }

--- 52 unchanged lines hidden --- 		105 iovcnt * sizeof(struct iovec));
106 iov = localiov;
107 }
108 for (cnt = 0; wret >= iov->iov_len; ++cnt) {
109 wret -= iov->iov_len;
110 ++iov;
111 --iovcnt;
112 }

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