2004-11-03 13:51:07 +00:00
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.\" Hey Emacs! This file is -*- nroff -*- source.
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.\" This man page was written by Jeremy Phelps <jphelps@notreached.net>.
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.\" Redistribute and modify at will.
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.\"
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2008-06-03 12:25:15 +00:00
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.TH GETPT 3 2008-06-03 "GNU" "Linux Programmer's Manual"
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2004-11-03 13:51:07 +00:00
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.SH NAME
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getpt \- open the pseudo-terminal master (PTM)
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.SH SYNOPSIS
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.nf
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2007-07-07 19:06:59 +00:00
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.B #define _GNU_SOURCE
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2004-11-03 13:51:07 +00:00
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.B #include <stdlib.h>
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.sp
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2007-07-07 19:06:59 +00:00
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.B "int getpt(void);"
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2004-11-03 13:51:07 +00:00
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.fi
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.SH DESCRIPTION
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2005-10-19 07:07:02 +00:00
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.BR getpt ()
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2004-11-03 13:51:07 +00:00
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opens a pseudo-terminal master and returns its file descriptor.
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It is equivalent to
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2007-12-22 22:47:15 +00:00
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.nf
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open(/dev/ptmx, O_RDWR | O_NOCTTY);
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.fi
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2004-11-03 13:51:07 +00:00
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on Linux systems, though the pseudo-terminal master is located
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elsewhere on some systems that use GNU Libc.
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.SH "RETURN VALUE"
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2005-10-19 07:07:02 +00:00
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.BR getpt ()
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2007-04-12 22:42:49 +00:00
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returns an open file descriptor upon successful completion.
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Otherwise, it
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2005-06-15 14:10:23 +00:00
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returns \-1 and sets
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2004-11-03 13:51:07 +00:00
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.I errno
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to indicate the error.
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2008-06-03 09:31:29 +00:00
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.SH ERRORS
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.BR getpt ()
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can fail with various errors described in
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.BR open (2).
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2004-11-03 13:51:07 +00:00
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.SH CONFORMING TO
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2005-10-19 07:07:02 +00:00
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.BR getpt ()
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2008-04-26 21:15:52 +00:00
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is glibc-specific;
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use
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.BR posix_openpt (3)
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instead.
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2004-11-03 13:51:07 +00:00
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.SH "SEE ALSO"
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.BR grantpt (3),
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.BR ptsname (3),
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2004-12-17 12:46:00 +00:00
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.BR posix_openpt (3),
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2004-11-03 13:51:07 +00:00
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.BR unlockpt (3),
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2005-10-10 13:14:12 +00:00
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.BR ptmx (4),
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.BR pty (7)
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