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46 .TH TCSENDBREAK 3C "Aug 14, 2002"
48 tcsendbreak \- send a ``break'' for a specific duration
54 \fBint\fR \fBtcsendbreak\fR(\fBint\fR \fIfildes\fR, \fBint\fR \fIduration\fR);
60 The \fIfildes\fR argument is an open file descriptor associated with a
64 If the terminal is using asynchronous serial data transmission,
65 \fBtcsendbreak()\fR will cause transmission of a continuous stream of
66 zero-valued bits for a specific duration. If \fIduration\fR is 0, it will
67 cause transmission of zero-valued bits for at least 0.25 seconds, and not more
68 than 0.5 seconds. If \fIduration\fR is not 0, it behaves in a way similar to
72 If the terminal is not using asynchronous serial data transmission, it sends
73 data to generate a break condition or returns without taking any action.
76 Attempts to use \fBtcsendbreak()\fR from a process which is a member of a
77 background process group on a \fIfildes\fR associated with its controlling
78 terminal will cause the process group to be sent a \fBSIGTTOU\fR signal. If the
79 calling process is blocking or ignoring \fBSIGTTOU\fR signals, the process is
80 allowed to perform the operation, and no signal is sent.
84 Upon successful completion, \fB0\fR is returned. Otherwise, \fB\(mi1\fR is
85 returned and \fBerrno\fR is set to indicate the error.
89 The \fBtcsendbreak()\fR function will fail if:
96 The \fIfildes\fR argument is not a valid file descriptor.
105 The file associated with \fIfildes\fR is not a terminal.
110 The \fBtcsendbreak()\fR function may fail if:
117 The process group of the writing process is orphaned, and the writing process
118 is not ignoring or blocking \fBSIGTTOU\fR.
124 See \fBattributes\fR(5) for descriptions of the following attributes:
132 ATTRIBUTE TYPE ATTRIBUTE VALUE
134 Interface Stability Standard
136 MT-Level MT-Safe, and Async-Signal-Safe
142 \fBtcdrain\fR(3C), \fBattributes\fR(5), \fBstandards\fR(5), \fBtermio\fR(7I)