static dmtcp::string _resolveSymlink(dmtcp::string path) { dmtcp::string device = jalib::Filesystem::ResolveSymlink(path); if (dmtcp_real_to_virtual_pid && path.length() > 0 && dmtcp::Util::strStartsWith(device, "/proc/")) { int index = 6; char *rest; char newpath[128]; JASSERT(device.length() < sizeof newpath); pid_t realPid = strtol(&path[index], &rest, 0); if (realPid > 0 && *rest == '/') { pid_t virtualPid = dmtcp_real_to_virtual_pid(realPid); sprintf(newpath, "/proc/%d%s", virtualPid, rest); device = newpath; } } return device; }
void dmtcp::DmtcpCoordinatorAPI::sendCoordinatorHandshake ( const dmtcp::string& progname, UniquePid compGroup /*= UniquePid()*/, int np /*= -1*/, DmtcpMessageType msgType /*= DMT_HELLO_COORDINATOR*/) { JTRACE("sending coordinator handshake")(UniquePid::ThisProcess()); dmtcp::string hostname = jalib::Filesystem::GetCurrentHostname(); const char *prefixPathEnv = getenv(ENV_VAR_PREFIX_PATH); dmtcp::string prefixDir; DmtcpMessage hello_local; hello_local.type = msgType; hello_local.params[0] = np; hello_local.compGroup = compGroup; hello_local.restorePort = theRestorePort; if (getenv(ENV_VAR_VIRTUAL_PID) == NULL) { hello_local.virtualPid = -1; } else { hello_local.virtualPid = (pid_t) atoi(getenv(ENV_VAR_VIRTUAL_PID)); } const char* interval = getenv ( ENV_VAR_CKPT_INTR ); /* DmtcpMessage constructor default: * hello_local.theCheckpointInterval: DMTCPMESSAGE_SAME_CKPT_INTERVAL */ if ( interval != NULL ) hello_local.theCheckpointInterval = jalib::StringToInt ( interval ); // Tell the coordinator the ckpt interval only once. It can change later. _dmtcp_unsetenv ( ENV_VAR_CKPT_INTR ); hello_local.extraBytes = hostname.length() + 1 + progname.length() + 1; if (prefixPathEnv != NULL) { /* If --prefix was defined then this process is either running on the local * node (the home of first process in the comptation) or a remote node. * * If the process is running on the local node, the prefix-path-env may be * different from the prefix-dir of this binary, in which case, we want to * send the prefix-path of this binary to the coordinator and the * coordinator will save it as the local-prefix. * * However, if this is running on a remote node, the prefix-path-env would * be the same as the prefix-path of this binary and we should send the * prefix-path-env to the coordinator and the coordinator will note this as * the remote-prefix. */ dmtcp::string utilDirPrefix = jalib::Filesystem::DirName(getenv(ENV_VAR_UTILITY_DIR)); if (utilDirPrefix == jalib::Filesystem::ResolveSymlink(prefixPathEnv)) { prefixDir = prefixPathEnv; } else { prefixDir = utilDirPrefix; } hello_local.extraBytes += prefixDir.length() + 1; } _coordinatorSocket << hello_local; _coordinatorSocket.writeAll( hostname.c_str(),hostname.length()+1); _coordinatorSocket.writeAll( progname.c_str(),progname.length()+1); if (!prefixDir.empty()) { _coordinatorSocket.writeAll(prefixDir.c_str(), prefixDir.length()+1); } }