SSH_AGENTPID_ENV_NAME
pidstr = getenv(SSH_AGENTPID_ENV_NAME);
SSH_AGENTPID_ENV_NAME);
SSH_AGENTPID_ENV_NAME, pidstr, errstr);
printf(format, SSH_AGENTPID_ENV_NAME);
printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
SSH_AGENTPID_ENV_NAME);
setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {