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GNU/Linux |
CentOS 5.6 |
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posix_openpt(3) |
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posix_openpt − open a pseudo-terminal device
#define
_XOPEN_SOURCE
#include <stdlib.h>
#include <fcntl.h>
char *posix_openpt(int flags);
The posix_openpt() function opens an unused pseudo-terminal 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:
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O_RDWR |
Open the device for both reading and writing. It is usual to specify this flag. |
O_NOCTTY
Do not make this device the controlling terminal for the process.
On success, ptsname() returns a non-negative file descriptor which is the lowest numbered unused descriptor. On failure, −1 is returned, and errno is set to indicate the error.
See open(2).
posix_openpt() is part of the Unix98 pseudo-terminal support (see pts(4)). This function is specified in POSIX.1-2001.
This function is a recent invention in POSIX. Some Unix implementations that support System V (aka Unix 98) pseudo-terminals don’t have this function, but it is easy to implement:
int
posix_openpt(int flags)
{
return open("/dev/ptmx", flags);
}
open(2), getpt(3), grantpt(3), ptsname(3), unlock(3), pts(4), pty(7)
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posix_openpt(3) | |