| // `errno` is only meaningful when it fails. E.g., a successful `fork()` sets | |
| // `errno` to `EINVAL` in child process on some macos | |
| // (https://stackoverflow.com/a/20295079), and thus `errno` should really only | |
| // be inspected if an error occurred. | |
| // | |
| // All functions used in `libshm` (so far) indicate error by returning `-1`. If | |
| // you want to use a function with a different error reporting mechanism, you | |
| // need to port `SYSCHECK` from `torch/lib/c10d/Utils.hpp`. | |
| while (true) { \ | |
| if ((expr) == -1) { \ | |
| if (errno == EINTR) { \ | |
| continue; \ | |
| } else { \ | |
| throw std::system_error(errno, std::system_category()); \ | |
| } \ | |
| } else { \ | |
| break; \ | |
| } \ | |
| } | |