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