What is the difference between SIGCLD and SIGCHLD signals?

Question

I want to know what is the basic difference between SIGCLD and SIGCHLD signals? Are these just different names for the same signal on different architectures?

Answer 1

Today, it's an alias, the exact system signal. Fact is, SIGCLD was the System V name for the today, SIGCHLD.

Historically, SIGCHLD originated on BSD and was the name adopted by POSIX. Based on System V SIGCLD the only differences happens when the signal is set to SIG_IGN:

BSD would generate zombies, System-V wouldn't.