mirror of
https://github.com/jart/cosmopolitan.git
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155b378a39
The organization of the source files is now much more rational. Old experiments that didn't work out are now deleted. Naming of things like files is now more intuitive.
117 lines
4.5 KiB
C
117 lines
4.5 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/asan.internal.h"
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#include "libc/intrin/asmflag.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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* Registers custom name of thread with system, e.g.
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*
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* void *worker(void *arg) {
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* pthread_setname_np(pthread_self(), "justine");
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* pause();
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* return 0;
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* }
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*
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* int main(int argc, char *argv[]) {
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* pthread_t id;
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* pthread_create(&id, 0, worker, 0);
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* pthread_join(id, 0);
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* }
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*
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* ProTip: The `htop` software is good at displaying thread names.
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*
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* @return 0 on success, or errno on error
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* @raise ERANGE if length of `name` exceeded system limit, in which
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* case the name may have still been set with os using truncation
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* @raise ENOSYS on MacOS, Windows, and OpenBSD
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* @see pthread_getname_np()
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*/
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int pthread_setname_np(pthread_t thread, const char *name) {
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char path[128], *p;
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int e, fd, rc, tid, len;
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tid = ((struct PosixThread *)thread)->tid;
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len = strlen(name);
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if (IsLinux()) {
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if (tid == gettid()) {
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e = errno;
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if (prctl(PR_SET_NAME, name) == -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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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_WRONLY | 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_write(fd, name, len);
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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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}
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if (len > 15) {
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// linux is documented as truncating here. we still set the name
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// since the limit might be raised in the future checking return
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// value of this function is a bummer. Grep it for TASK_COMM_LEN
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return ERANGE;
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}
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return 0;
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} else if (IsFreebsd()) {
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char cf;
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int ax, dx;
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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"(323 /* thr_set_name */), "D"(tid), "S"(name)
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: "rcx", "r8", "r9", "r10", "r11", "memory");
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return !cf ? 0 : ax;
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} else if (IsNetbsd()) {
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char cf;
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int ax, dx;
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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"(323 /* _lwp_setname */), "D"(tid), "S"(name)
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: "rcx", "r8", "r9", "r10", "r11", "memory");
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return !cf ? 0 : ax;
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} else {
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return ENOSYS;
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}
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}
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