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87 lines
3.1 KiB
Plaintext
87 lines
3.1 KiB
Plaintext
// Copyright (c) 2015 Ryan Prichard
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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#include "Util.h"
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#include <assert.h>
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include "../shared/DebugClient.h"
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// Write the entire buffer, restarting it as necessary.
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bool writeAll(int fd, const void *buffer, size_t size) {
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size_t written = 0;
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while (written < size) {
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int ret = write(fd,
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reinterpret_cast<const char*>(buffer) + written,
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size - written);
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if (ret == -1 && errno == EINTR) {
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continue;
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}
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if (ret <= 0) {
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trace("write failed: "
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"fd=%d errno=%d size=%u written=%d ret=%d",
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fd,
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errno,
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static_cast<unsigned int>(size),
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static_cast<unsigned int>(written),
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ret);
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return false;
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}
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assert(static_cast<size_t>(ret) <= size - written);
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written += ret;
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}
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assert(written == size);
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return true;
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}
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bool writeStr(int fd, const char *str) {
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return writeAll(fd, str, strlen(str));
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}
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void selectWrapper(const char *diagName, int nfds, fd_set *readfds) {
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int ret = select(nfds, readfds, NULL, NULL, NULL);
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if (ret < 0) {
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if (errno == EINTR) {
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FD_ZERO(readfds);
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return;
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}
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#ifdef WINPTY_TARGET_MSYS1
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// The select system call sometimes fails with EAGAIN instead of EINTR.
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// This apparantly only happens with the old Cygwin fork "MSYS" used in
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// the mingw.org project. select is not supposed to fail with EAGAIN,
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// and EAGAIN does not make much sense as an error code. (The whole
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// point of select is to block.)
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if (errno == EAGAIN) {
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trace("%s select returned EAGAIN: interpreting like EINTR",
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diagName);
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FD_ZERO(readfds);
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return;
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}
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#endif
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fprintf(stderr, "Internal error: %s select failed: "
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"error %d", diagName, errno);
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abort();
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}
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}
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