diff options
| -rw-r--r-- | butl/process | 6 | ||||
| -rw-r--r-- | butl/process.cxx | 20 |
2 files changed, 26 insertions, 0 deletions
diff --git a/butl/process b/butl/process index bbd0162..6077ad3 100644 --- a/butl/process +++ b/butl/process @@ -75,6 +75,12 @@ namespace butl bool wait (); + // Return true if the process has already terminated in which case + // the argument is set to the result of wait(). + // + bool + try_wait (bool&); + ~process () {if (id != 0) wait ();} // Move constructible-only type. diff --git a/butl/process.cxx b/butl/process.cxx index 66a831e..bd13392 100644 --- a/butl/process.cxx +++ b/butl/process.cxx @@ -121,6 +121,26 @@ namespace butl return WIFEXITED (status) && WEXITSTATUS (status) == 0; } + bool process:: + try_wait (bool& s) + { + if (id != 0) + { + int r (waitpid (id, &status, WNOHANG)); + + if (r == 0) // Not exited yet. + return false; + + id = 0; // We have tried. + + if (r == -1) + throw process_error (errno, false); + } + + s = WIFEXITED (status) && WEXITSTATUS (status) == 0; + return true; + } + #else // _WIN32 static void |