mirror of
https://github.com/jart/cosmopolitan.git
synced 2024-05-17 02:52:40 +00:00
68c7c9c1e0
- Use good ELF technique in cosmo_dlopen() - Make strerror() conform more to other libc impls - Introduce __clear_cache() and use it in cosmo_dlopen() - Remove libc/fmt/fmt.h header (trying to kill off LIBC_FMT)
105 lines
4.1 KiB
C
105 lines
4.1 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/assert.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/struct/fd.internal.h"
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#include "libc/calls/struct/stat.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/fmt/itoa.h"
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#include "libc/fmt/magnumstrs.internal.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/log/log.h"
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#include "libc/nt/console.h"
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#include "libc/nt/enum/consolemodeflags.h"
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#include "libc/str/str.h"
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#include "libc/sysv/errfuns.h"
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#define FIODGNAME 0x80106678 // freebsd
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static textwindows errno_t sys_ttyname_nt(int fd, char *buf, size_t size) {
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if (fd + 0u >= g_fds.n) return EBADF;
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if (g_fds.p[fd].kind != kFdConsole) return ENOTTY;
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if (strlcpy(buf, "/dev/tty", size) >= size) return ERANGE;
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return 0;
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}
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// clobbers errno
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static errno_t ttyname_freebsd(int fd, char *buf, size_t size) {
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struct fiodgname_arg {
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int len;
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void *buf;
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} fg;
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fg.buf = buf;
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fg.len = size;
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if (sys_ioctl(fd, FIODGNAME, &fg) != -1) {
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return 0;
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} else {
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return ENOTTY;
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}
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}
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// clobbers errno
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static errno_t ttyname_linux(int fd, char *buf, size_t size) {
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ssize_t got;
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struct stat st1, st2;
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char name[14 + 12 + 1];
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if (!isatty(fd)) return errno;
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FormatInt32(stpcpy(name, "/proc/self/fd/"), fd);
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got = readlink(name, buf, size);
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if (got == -1) return errno;
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if (got >= size) return ERANGE;
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buf[got] = 0;
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if (stat(buf, &st1) || fstat(fd, &st2)) return errno;
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if (st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino) return ENODEV;
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return 0;
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}
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/**
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* Returns name of terminal.
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*
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* @return 0 on success, or error number on error
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* @raise ERANGE if `size` was too small
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* @returnserrno
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*/
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errno_t ttyname_r(int fd, char *buf, size_t size) {
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errno_t e, res;
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e = errno;
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if (IsLinux()) {
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res = ttyname_linux(fd, buf, size);
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} else if (IsFreebsd()) {
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res = ttyname_freebsd(fd, buf, size);
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} else if (IsWindows()) {
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res = sys_ttyname_nt(fd, buf, size);
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} else {
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// TODO(jart): Use that fstat(dev/ino) + readdir(/dev/) trick.
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if (strlcpy(buf, "/dev/tty", size) < size) {
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res = 0;
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} else {
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res = ERANGE;
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}
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}
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errno = e;
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STRACE("ttyname_r(%d, %#.*hhs) → %s", fd, (int)size, buf,
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!res ? "0" : _strerrno(res));
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return res;
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}
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