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Use process group signal handling to reach past the shell #1126

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Use process group signal handling to reach past the shell #1126

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7 changes: 4 additions & 3 deletions src/tools/Subprocess.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -51,19 +51,19 @@ class SubprocessPid {
void stop() noexcept {
// Signals give problems with MPI on Travis.
// I disable them for now.
if(SubprocessPidGetenvSignals()) kill(pid,SIGSTOP);
if(SubprocessPidGetenvSignals()) kill(-pid,SIGSTOP);
}
void cont() noexcept {
// Signals give problems with MPI on Travis.
// I disable them for now.
if(SubprocessPidGetenvSignals()) kill(pid,SIGCONT);
if(SubprocessPidGetenvSignals()) kill(-pid,SIGCONT);
}
~SubprocessPid() {
// the destructor implies we do not need the subprocess anymore, so SIGKILL
// is the fastest exit.
// if we want to gracefully kill the process with a delay, it would be cleaner
// to have another member function
kill(pid,SIGKILL);
kill(-pid,SIGINT);
// Wait for the child process to terminate
// This is anyway required to avoid leaks
int status;
Expand Down Expand Up @@ -99,6 +99,7 @@ Subprocess::Subprocess(const std::string & cmd) {
if(dup(pc[0])<0) plumed_error()<<"error duplicating file";
if(close(pc[1])<0) plumed_error()<<"error closing file";
if(close(cp[0])<0) plumed_error()<<"error closing file";
if(setpgid(0,0)<0) plumed_error()<<"error setting process group";;
auto err=execv(arr[0],arr);
plumed_error()<<"error in script file " << cmd << ", execv returned "<<err;
}
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