#define _XOPEN_SOURCE /* See feature_test_macros(7) */
char *ptsname(int fd);
#define _GNU_SOURCE /* See feature_test_macros(7) */
int ptsname_r(int fd, char *buf, size_t buflen);
DESCRIPTIONThe ptsname() function returns the name of the slave pseudoterminal device corresponding to the master referred to by fd.
The ptsname_r() function is the reentrant equivalent of ptsname(). It returns the name of the slave pseudoterminal device as a null-terminated string in the buffer pointed to by buf. The buflen argument specifies the number of bytes available in buf.
RETURN VALUEOn success, ptsname() returns a pointer to a string in static storage which will be overwritten by subsequent calls. This pointer must not be freed. On failure, NULL is returned.
On success, ptsname_r() returns 0. On failure, a nonzero value is returned and errno is set to indicate the error.
- (ptsname_r() only) buf is NULL.
- fd does not refer to a pseudoterminal master device.
- (ptsname_r() only) buf is too small.
VERSIONSptsname() is provided in glibc since version 2.1.
ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7).
|ptsname()||Thread safety||MT-Unsafe race:ptsname|
CONFORMING TOPOSIX.1-2001, POSIX.1-2008.
ptsname() is part of the UNIX 98 pseudoterminal support (see pts(4)).
ptsname_r() is a Linux extension. A version of this function is documented on Tru64 and HP-UX, but on those implementations, -1 is returned on error, with errno set to indicate the error. Avoid using this function in portable programs.
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