NAME
posixopenpt - open a pseudoterminal device SYNOPSIS
#include
#include
int posixopenpt(int flags); Feature Test Macro Requirements for glibc (see featuretestmacros(7)): posixopenpt(): XOPENSOURCE >= 600 DESCRIPTION The posixopenpt() function opens an unused pseudoterminal master device, returning a file descriptor that can be used to refer to that device. The flags argument is a bit mask that ORs together zero or more of the following flags: ORDWR Open the device for both reading and writing. It is usual to specify this flag. ONOCTTY Do not make this device the controlling terminal for the process. RETURN VALUE On success, posixopenpt() returns a nonnegative file descriptor which is the lowest numbered unused descriptor. On failure, -1 is returned, and errno is set to indicate the error. ERRORS See open(2). VERSIONS Glibc support for posixopenpt() has been provided since version 2.2.1. ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). ┌───────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├───────────────┼───────────────┼─────────┤
│posixopenpt() │ Thread safety │ MT-Safe │ └───────────────┴───────────────┴─────────┘ CONFORMING TO posixopenpt() is part of the UNIX 98 pseudoterminal support (see
pts(4)). This function is specified in POSIX.1-2001. NOTES The posixopenpt() function is a recent invention in POSIX. Some UNIX implementations that support System V (aka UNIX 98) pseudoterminals don't have this function, but it is easy to implement: int posixopenpt(int flags) { return open("/dev/ptmx", flags); } Calling posixopenpt() creates a pathname for the corresponding pseu‐ doterminal slave device. The pathname of the slave device can be obtained using ptsname(3). The slave device pathname exists only as long as the master device is open. SEE ALSO open(2), getpt(3), grantpt(3), ptsname(3), unlockpt(3), pts(4), pty(7) COLOPHON
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2012-04-20 POSIXOPENPT(3)