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93 lines
2.5 KiB
C
93 lines
2.5 KiB
C
/* ptsname -- return the name of a pty slave given an FD to the pty master
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Copyright (C) 1999-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <hurd.h>
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#include <hurd/fd.h>
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#include <hurd/term.h>
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/* Return the pathname of the pseudo terminal slave associated with
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the master FD is open on, or NULL on errors.
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The returned storage is good until the next call to this function. */
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char *
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ptsname (int fd)
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{
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static string_t peername;
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error_t err;
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err = __ptsname_r (fd, peername, sizeof (peername));
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return err ? NULL : peername;
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}
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/* We don't need STP, but fill it for conformity with the Linux version... */
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int
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__ptsname_internal (int fd, char *buf, size_t buflen, struct stat64 *stp)
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{
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string_t peername;
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size_t len;
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error_t err;
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int ttype;
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if (HURD_DPORT_USE (fd, __term_get_bottom_type (port, &ttype)) == 0)
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{
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/* get_bottom_type suceeded, this is the slave side. */
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errno = ENOTTY;
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return ENOTTY;
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}
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if (err = HURD_DPORT_USE (fd, __term_get_peername (port, peername)))
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{
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if (err == EMIG_BAD_ID || err == EOPNOTSUPP)
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err = ENOTTY;
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return __hurd_dfail (fd, err), errno;
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}
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len = __strnlen (peername, sizeof peername - 1) + 1;
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if (len > buflen)
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{
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errno = ERANGE;
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return ERANGE;
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}
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if (stp)
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{
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if (__stat64 (peername, stp) < 0)
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return errno;
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}
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memcpy (buf, peername, len);
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return 0;
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}
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/* Store at most BUFLEN characters of the pathname of the slave pseudo
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terminal associated with the master FD is open on in BUF.
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Return 0 on success, otherwise an error number. */
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int
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__ptsname_r (int fd, char *buf, size_t buflen)
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{
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return __ptsname_internal (fd, buf, buflen, NULL);
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}
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libc_hidden_def (__ptsname_r)
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weak_alias (__ptsname_r, ptsname_r)
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