[Process (Vault)] child::wait error on OS X 10.6
I am using the version of the Process library that was announced by Boris Schaeling in this document: http://www.highscore.de/cpp/process/ I used the link in the introduction to get the zip file, so I think I have the correct version. I am running the following test function: namespace bp = boost::process; namespace bios = boost::iostreams; int BoostProcessTest (void) { std::cout << "\nTesting launch of child process using Boost.Process\n"; std::string exec = bp::find_executable_in_path("svn"); std::vectorstd::string args; args.push_back("svn"); args.push_back("info"); // context bp::context ctx; // child launch bp::child c = bp::launch(exec, args, ctx); // sleep(1); //wait const bp::status s = c.wait(); // parse status if (s.exited() && s.exit_status() == EXIT_SUCCESS) std::cout << "Directory is a working copy." << std::endl; else std::cout << "Directory is not a working copy." << std::endl; std::cout << std::endl; return 0; } I call this function in a loop for as long as it returns 0, which should be forever. The test is run in a directory that is NOT a svn working copy, so all that the child process does is to write a line to stderr and exit. What I'm seeing, however is this message: Error: Caught an exception! boost::process::child::wait: waitpid(2) failed: Interrupted system call The only way I have found to make that go away is by adding the sleep (1) call (commented out above). Then it runs forever. I'm hoping Boris will read this and have some idea of what's happening. My google searches haven't turned up much of value. - Rush
On Thu, 01 Oct 2009 22:13:30 +0200, Rush Manbert
[...]I used the link in the introduction to get the zip file, so I think I have the correct version.
I applied a few patches to the version in the sandbox at https://svn.boost.org/svn/boost/sandbox/process/. One of the patches I had received from someone using Boost.Process on Mac OS X 10.4.11 which makes me believe that Boost.Process basically works on OS X. While you can update your version of the library, too, I don't think that the changes in the sandbox will fix your problem.
I am running the following test function:
namespace bp = boost::process; namespace bios = boost::iostreams;
int BoostProcessTest (void) { std::cout << "\nTesting launch of child process using Boost.Process\n";
std::string exec = bp::find_executable_in_path("svn"); std::vectorstd::string args; args.push_back("svn"); args.push_back("info");
// context bp::context ctx;
// child launch bp::child c = bp::launch(exec, args, ctx); // sleep(1);
//wait const bp::status s = c.wait();
// parse status if (s.exited() && s.exit_status() == EXIT_SUCCESS) std::cout << "Directory is a working copy." << std::endl; else std::cout << "Directory is not a working copy." << std::endl; std::cout << std::endl;
return 0; }
I call this function in a loop for as long as it returns 0, which should be forever.
The test is run in a directory that is NOT a svn working copy, so all that the child process does is to write a line to stderr and exit.
What I'm seeing, however is this message: Error: Caught an exception! boost::process::child::wait: waitpid(2) failed: Interrupted system call
The only way I have found to make that go away is by adding the sleep (1) call (commented out above). Then it runs forever.
Can you copy and paste your code in BoostProcessTest() to main() in a new test program (just to make sure that there is nothing else in your program which interrupts waitpid())? Is there any change if you run your program in a svn directory? Do you still get the exception if you try to launch another program? Boris
participants (2)
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Boris Schaeling -
Rush Manbert