getpt(3) - f38

1getpt(3)                   Library Functions Manual                   getpt(3)
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NAME

6       getpt - open a new pseudoterminal master
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LIBRARY

9       Standard C library (libc, -lc)
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SYNOPSIS

12       #define _GNU_SOURCE             /* See feature_test_macros(7) */
13       #include <stdlib.h>
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15       int getpt(void);
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DESCRIPTION

18       getpt() opens a new pseudoterminal device and returns a file descriptor
19       that refers to that device.  It is equivalent to opening the pseudoter‐
20       minal multiplexor device
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22           open("/dev/ptmx", O_RDWR);
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24       on  Linux  systems, though the pseudoterminal multiplexor device is lo‐
25       cated elsewhere on some systems that use the GNU C library.
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RETURN VALUE

28       getpt() returns an open file  descriptor  upon  successful  completion.
29       Otherwise, it returns -1 and sets errno to indicate the error.
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ERRORS

32       getpt() can fail with various errors described in open(2).
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ATTRIBUTES

35       For  an  explanation  of  the  terms  used  in  this  section,  see at‐
36       tributes(7).
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38       ┌────────────────────────────────────────────┬───────────────┬─────────┐
39       │Interface                                   │ Attribute     │ Value   │
40       ├────────────────────────────────────────────┼───────────────┼─────────┤
41       │getpt()                                     │ Thread safety │ MT-Safe │
42       └────────────────────────────────────────────┴───────────────┴─────────┘
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VERSIONS

45       Use posix_openpt(3) instead.
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STANDARDS

48       GNU.
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HISTORY

51       glibc 2.1.
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