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Call select() before reading from the child.

In readFromChild() for non-Windows: Call select() to check
for available data.  Reason: To ensure that ::read() doesn't
hang if the child exits during the call to ::read().
adeniz_1
Alban Deniz 11 months ago
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a1cd1bb00d
1 changed files with 23 additions and 0 deletions
  1. 23
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      child.cpp

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child.cpp View File

} }
#else #else
fd_set readFd;
int retVal;
struct timeval timeout = {0, 0};
FD_ZERO(&readFd);
FD_SET(inputFileDescriptor, &readFd);
// Check if input is available.
retVal = select(inputFileDescriptor + 1, &readFd, NULL, NULL, &timeout);
if (-1 == retVal) {
throw std::runtime_error("Error from select() when reading from the "
"child process: " + getErrorText());
}
// Is data available?
if (0 == retVal) {
// No. Wait and try again.
pollTimer.pause();
continue;
}
ssize_t nBytesRead; ssize_t nBytesRead;
nBytesRead = ::read(inputFileDescriptor, nBytesRead = ::read(inputFileDescriptor,

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