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https://github.com/jart/cosmopolitan.git
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d1d4388201
It hasn't been helpful enough to be justify the maintenance burden. What actually does help is mprotect(), kprintf(), --ftrace and --strace which can always be counted upon to work correctly. We aren't losing much with this change. Support for ASAN on AARCH64 was never implemented. Applying ASAN to the core libc runtimes was disabled many months ago. If there is some way to have an ASAN runtime for user programs that is less invasive we can potentially consider reintroducing support. But now is premature.
123 lines
5.2 KiB
C
123 lines
5.2 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et 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/cp.internal.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/iovec.h"
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#include "libc/calls/struct/iovec.internal.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/intrin/kprintf.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sock/sock.h"
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#include "libc/sock/struct/msghdr.h"
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#include "libc/sock/struct/msghdr.internal.h"
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#include "libc/sock/struct/sockaddr.internal.h"
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#include "libc/sock/syscall_fd.internal.h"
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#include "libc/str/str.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Sends a message from a socket.
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*
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* Note: Ancillary data currently isn't polyfilled across platforms.
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*
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* @param fd is the file descriptor returned by socket()
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* @param msg is a pointer to a struct msghdr containing all the allocated
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* buffers where to store incoming data.
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* @param flags MSG_OOB, MSG_DONTROUTE, MSG_PARTIAL, MSG_NOSIGNAL, etc.
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* @return number of bytes received, or -1 w/ errno
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* @error EINTR, EHOSTUNREACH, ECONNRESET (UDP ICMP Port Unreachable),
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* EPIPE (if MSG_NOSIGNAL), EMSGSIZE, ENOTSOCK, EFAULT, etc.
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* @cancelationpoint
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* @asyncsignalsafe
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* @restartable (unless SO_RCVTIMEO)
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*/
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ssize_t recvmsg(int fd, struct msghdr *msg, int flags) {
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ssize_t rc, got;
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struct msghdr msg2;
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union sockaddr_storage_bsd bsd;
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BEGIN_CANCELATION_POINT;
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if (fd < g_fds.n && g_fds.p[fd].kind == kFdZip) {
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rc = enotsock();
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} else if (!IsWindows()) {
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if (IsBsd() && msg->msg_name) {
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memcpy(&msg2, msg, sizeof(msg2));
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if (!(rc = sockaddr2bsd(msg->msg_name, msg->msg_namelen, &bsd,
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&msg2.msg_namelen))) {
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msg2.msg_name = &bsd.sa;
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if ((rc = sys_recvmsg(fd, &msg2, flags)) != -1) {
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sockaddr2linux(msg2.msg_name, msg2.msg_namelen, msg->msg_name,
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&msg->msg_namelen);
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}
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}
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} else {
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rc = sys_recvmsg(fd, msg, flags);
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}
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} else if (__isfdopen(fd)) {
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if (!msg->msg_control) {
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if (__isfdkind(fd, kFdSocket)) {
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rc = sys_recvfrom_nt(fd, msg->msg_iov, msg->msg_iovlen, flags,
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msg->msg_name, &msg->msg_namelen);
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} else if (__isfdkind(fd, kFdFile) && !msg->msg_name) { /* socketpair */
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if (!flags) {
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if ((got = sys_read_nt(fd, msg->msg_iov, msg->msg_iovlen, -1)) !=
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-1) {
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msg->msg_flags = 0;
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rc = got;
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} else {
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rc = -1;
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}
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} else {
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rc = einval(); // flags not supported on nt
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}
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} else {
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rc = enotsock();
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}
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} else {
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rc = einval(); // control msg not supported on nt
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}
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} else {
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rc = ebadf();
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}
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END_CANCELATION_POINT;
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#if SYSDEBUG && _DATATRACE
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if (__strace > 0 && strace_enabled(0) > 0) {
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if (!msg || (rc == -1 && errno == EFAULT)) {
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DATATRACE("recvmsg(%d, %p, %#x) → %'ld% m", fd, msg, flags, rc);
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} else {
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kprintf(STRACE_PROLOGUE "recvmsg(%d, [{", fd);
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if (msg->msg_namelen)
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kprintf(".name=%#.*hhs, ", msg->msg_namelen, msg->msg_name);
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if (msg->msg_controllen)
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kprintf(".control=%#.*hhs, ", msg->msg_controllen, msg->msg_control);
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if (msg->msg_flags)
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kprintf(".flags=%#x, ", msg->msg_flags);
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kprintf(".iov=%s", DescribeIovec(rc, msg->msg_iov, msg->msg_iovlen));
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kprintf("], %#x) → %'ld% m\n", flags, rc);
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}
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}
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#endif
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return rc;
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}
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