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@nuald nuald/build.gradle
Last active May 12, 2017

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Waiting for the named USB device in macos.
def APPLICATION_GROUP = 'Application'
ext {
device = 'Cruzer'
program = 'wait'
}
task compile(type: Exec) {
group APPLICATION_GROUP
description 'Compiles the native program.'
def src = 'wait.c'
inputs.files src
outputs.files program
commandLine 'clang', '-framework', 'IOKit', src, '-o', program
}
task runSimple(type: Exec, dependsOn: compile) {
group APPLICATION_GROUP
description 'Waits for the device.'
commandLine "./$program", device
}
task run(type: Exec, dependsOn: compile) {
group APPLICATION_GROUP
description 'Waits for the device using the line-buffered mode.'
commandLine 'script', '-q', '/dev/null', "./$program", device
}
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <IOKit/IOKitLib.h>
#include <IOKit/usb/IOUSBLib.h>
int main(int argc, const char *argv[]) {
if (argc < 2) {
printf("Please specify the device name.\n");
return 1;
}
const char* requiredName = argv[1];
size_t length = strlen(requiredName);
printf("Waiting for %s\n", requiredName);
CFMutableDictionaryRef matchingDict;
bool found = false;
while (!found && (matchingDict = IOServiceMatching(kIOUSBDeviceClassName))) {
io_iterator_t iter;
io_service_t device;
bool iterIsValid = IOServiceGetMatchingServices(kIOMasterPortDefault, matchingDict, &iter) == KERN_SUCCESS;
unsigned counter = 0;
while (!found && iterIsValid && (device = IOIteratorNext(iter))) {
io_name_t devName;
counter++;
bool nameIsValid = IORegistryEntryGetName(device, devName) == KERN_SUCCESS;
found = nameIsValid && !strncmp(devName, requiredName, length);
IOObjectRelease(device);
}
printf("Got %d connected devices. %s\n", counter, found ? "Found!" : "Still waiting...");
iterIsValid && IOObjectRelease(iter);
!found && sleep(1);
}
return !found;
}
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