mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
c7a8cd21e9
This change improves copy_file_range(), sendfile(), splice(), openpty(), closefrom(), close_range(), fadvise() and posix_fadvise() in addition to writing tests that confirm things like errno and seeking behavior across platforms. We now less aggressively polyfill behavior with some of these functions when the platform support isn't available. Please see: https://justine.lol/cosmopolitan/functions.html
117 lines
4.6 KiB
C
117 lines
4.6 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 2022 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/calls/calls.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/intrin/asmflag.h"
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#include "libc/macros.internal.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/consts/pr.h"
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#include "libc/thread/posixthread.internal.h"
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/**
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* Gets name of thread registered with system, e.g.
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*
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* char name[64];
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* pthread_getname_np(thread, name, sizeof(name));
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*
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* If the thread doesn't have a name, then empty string is returned.
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* This implementation guarantees `buf` is always modified, even on
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* error, and will always be nul-terminated. If `size` is 0 then this
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* function returns 0. Your `buf` is also chomped to remove newlines.
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*
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* @return 0 on success, or errno on error
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* @raise ERANGE if `size` wasn't large enough, in which case your
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* result will still be returned truncated if possible
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* @raise ENOSYS on MacOS, Windows, FreeBSD, and OpenBSD
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*/
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errno_t pthread_getname_np(pthread_t thread, char *name, size_t size) {
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int e, fd, rc, tid, len;
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if (!size) return 0;
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bzero(name, size);
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tid = ((struct PosixThread *)thread)->tid;
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if (IsLinux()) {
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// TASK_COMM_LEN is 16 on Linux so we're just being paranoid.
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char buf[256] = {0};
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if (tid == gettid()) {
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e = errno;
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if (prctl(PR_GET_NAME, buf) == -1) {
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rc = errno;
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errno = e;
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return rc;
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}
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} else {
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char path[128], *p = path;
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p = stpcpy(p, "/proc/self/task/");
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p = FormatUint32(p, tid);
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p = stpcpy(p, "/comm");
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e = errno;
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if ((fd = sys_open(path, O_RDONLY | O_CLOEXEC, 0)) == -1) {
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rc = errno;
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errno = e;
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return rc;
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}
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rc = sys_read(fd, buf, sizeof(buf) - 1);
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rc |= sys_close(fd);
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if (rc == -1) {
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rc = errno;
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errno = e;
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return rc;
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}
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_chomp(buf);
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}
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if ((len = strlen(buf))) {
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memcpy(name, buf, MIN(len, size - 1));
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}
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if (len > size - 1) {
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return ERANGE;
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}
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return 0;
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} else if (IsNetbsd()) {
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char cf;
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int ax, dx;
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// NetBSD doesn't document the subtleties of its nul-terminator
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// behavior, so like Linux we shall take the paranoid approach.
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asm volatile(CFLAG_ASM("syscall")
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: CFLAG_CONSTRAINT(cf), "=a"(ax), "=d"(dx)
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: "1"(324 /* _lwp_getname */), "D"(tid), "S"(name),
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"d"(size - 1)
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: "rcx", "r8", "r9", "r10", "r11", "memory");
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if (!cf) {
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// if size + our nul + kernel's nul is the buffer size, then we
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// can't say with absolute confidence truncation didn't happen.
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if (strlen(name) + 1 + 1 <= size) {
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return 0;
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} else {
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return ERANGE;
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}
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} else {
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return ax;
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}
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} else {
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return ENOSYS;
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}
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}
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