mirror of https://github.com/mkerrisk/man-pages
53 lines
1.1 KiB
Groff
53 lines
1.1 KiB
Groff
.\" 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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.TH GETPT 3 2008-06-14 "GNU" "Linux Programmer's Manual"
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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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.B #define _GNU_SOURCE
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.B #include <stdlib.h>
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.sp
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.B "int getpt(void);"
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.fi
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.SH DESCRIPTION
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.BR getpt ()
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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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.nf
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open(/dev/ptmx, O_RDWR | O_NOCTTY);
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.fi
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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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.BR getpt ()
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returns an open file descriptor upon successful completion.
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Otherwise, it
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returns \-1 and sets
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.I errno
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to indicate the error.
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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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.SH VERSIONS
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.BR getpt ()
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is provided in glibc since version 2.1.
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.SH CONFORMING TO
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.BR getpt ()
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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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.SH "SEE ALSO"
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.BR grantpt (3),
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.BR posix_openpt (3),
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.BR ptsname (3),
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.BR unlockpt (3),
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.BR ptmx (4),
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.BR pty (7)
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