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Print a distinct error when mmap() returns EAGAIN

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As mentioned in #119.
This commit is contained in:
Robbert van der Helm
2021-07-18 22:51:14 +02:00
parent 3c14f0391b
commit fe61a28524
2 changed files with 33 additions and 7 deletions
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src/common/audio-shm.cpp
+26 -7
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@@ -16,6 +16,8 @@
#include "audio-shm.h"
#include <iostream>
AudioShmBuffer::AudioShmBuffer(const Config& config)
: config(config),
shm(boost::interprocess::open_or_create,
@@ -61,12 +63,29 @@ void AudioShmBuffer::resize(const Config& new_config) {
}
void AudioShmBuffer::setup_mapping() {
// Apparently you get a `Resource temporarily unavailable` when calling
// `ftruncate()` with a size of 0 on shared memory
if (config.size > 0) {
shm.truncate(config.size);
buffer = boost::interprocess::mapped_region(
shm, boost::interprocess::read_write, 0, config.size, nullptr,
MAP_LOCKED);
try {
// Apparently you get a `Resource temporarily unavailable` when calling
// `ftruncate()` with a size of 0 on shared memory
if (config.size > 0) {
shm.truncate(config.size);
buffer = boost::interprocess::mapped_region(
shm, boost::interprocess::read_write, 0, config.size, nullptr,
MAP_LOCKED);
}
} catch (const boost::interprocess::interprocess_exception& error) {
if (error.get_native_error() == EAGAIN) {
std::cerr << "ERROR: Could not map shared memory. This means that"
<< std::endl;
std::cerr << " your user's memory locking limit has been set"
<< std::endl;
std::cerr << " too low. Check your distro's documentation or"
<< std::endl;
std::cerr << " wiki for instructions on how to set up"
<< std::endl;
std::cerr << " realtime privileges and memlock limits."
<< std::endl;
}
throw;
}
}