Add a Result to getpgid, and add getpgrp.
#386
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Add a `Result` return type to `getpgid`, as it can fail if there's no process with the given pid. And, add a a `getpgrp` function, which is similar to `getpgid`, but doesn't take a pid argument and always operates on the current process, which means it doesn't need a `Result` return type.
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Add a
Resultreturn type togetpgid, as it can fail if there's noprocess with the given pid.
And, add a a
getpgrpfunction, which is similar togetpgid, butdoesn't take a pid argument and always operates on the current process,
which means it doesn't need a
Resultreturn type.