mirror of https://github.com/mkerrisk/man-pages
69 lines
1.4 KiB
Groff
69 lines
1.4 KiB
Groff
.\" This man page was written by Jeremy Phelps <jphelps@notreached.net>.
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.\"
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.\" %%%LICENSE_START(FREELY_REDISTRIBUTABLE)
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.\" Redistribute and modify at will.
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.\" %%%LICENSE_END
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.\"
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.TH GETPT 3 2020-02-09 "GNU" "Linux Programmer's Manual"
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.SH NAME
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getpt \- open the pseudoterminal master (PTM)
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.SH SYNOPSIS
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.nf
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.BR "#define _GNU_SOURCE" " /* See feature_test_macros(7) */"
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.B #include <stdlib.h>
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.PP
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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 pseudoterminal master and returns its file descriptor.
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It is equivalent to
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.PP
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.in +4n
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.EX
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open("/dev/ptmx", O_RDWR);
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.EE
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.in
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.PP
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on Linux systems, though the pseudoterminal 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 ATTRIBUTES
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For an explanation of the terms used in this section, see
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.BR attributes (7).
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.TS
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allbox;
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lb lb lb
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l l l.
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Interface Attribute Value
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T{
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.BR getpt ()
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T} Thread safety MT-Safe
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.TE
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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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