ptsname - get name of the slave pseudo-terminal device
The ptsname() function shall return the name of the slave pseudo-terminal device associated with a master pseudo-terminal device. The fildes argument is a file descriptor that refers to the master device. The ptsname() function shall return a pointer to a string containing the pathname of the corresponding slave device.
The ptsname() function need not be thread-safe.
Upon successful completion, ptsname() shall return a pointer to a string which is the name of the pseudo-terminal slave device. Upon failure, ptsname() shall return a null pointer and may set errno. This could occur if fildes is an invalid file descriptor or if the slave device name does not exist in the file system.
The application shall not modify the string returned. The returned pointer might be invalidated or the string content might be overwritten by a subsequent call to ptsname(). The returned pointer and the string content might also be invalidated if the calling thread is terminated.
The ptsname() function may fail if:
- The fildes argument is not a valid file descriptor.
- The file associated with the fildes argument is not a master pseudo-terminal device.
See the RATIONALE section for posix_openpt.
grantpt, open, posix_openpt, ttyname, unlockpt
First released in Issue 4, Version 2.
Moved from X/OPEN UNIX extension to BASE.
A note indicating that this function need not be reentrant is added to the DESCRIPTION.
Austin Group Interpretation 1003.1-2001 #156 is applied.
POSIX.1-2008, Technical Corrigendum 1, XSH/TC1-2008/0468  and XSH/TC1-2008/0469  are applied.
POSIX.1-2008, Technical Corrigendum 2, XSH/TC2-2008/0298 , XSH/TC2-2008/0299 , and XSH/TC2-2008/0300  are applied.
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