int start_command(struct child_process *cmd)
{
int need_in, need_out, need_err;
int fdin[2], fdout[2], fderr[2];
int failed_errno = failed_errno;
I have not found failed_errno as global variable.
failed_errno = failed_errno means nothing.
It is possible coding error and should be
int failed_errno= 0 or
failed_errno=errno.
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