(libc.info.gz) Job Control is Optional

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(libc.info.gz) Concepts of Job Control

(libc.info.gz) Job Control

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 28.2 Job Control is Optional
 ============================
 
 Not all operating systems support job control.  GNU systems do support
 job control, but if you are using the GNU C Library on some other
 system, that system may not support job control itself.
 
    You can use the '_POSIX_JOB_CONTROL' macro to test at compile-time
 whether the system supports job control.   System Options.
 
    If job control is not supported, then there can be only one process
 group per session, which behaves as if it were always in the foreground.
 The functions for creating additional process groups simply fail with
 the error code 'ENOSYS'.
 
    The macros naming the various job control signals ( Job Control
 Signals) are defined even if job control is not supported.  However,
 the system never generates these signals, and attempts to send a job
 control signal or examine or specify their actions report errors or do
 nothing.
 

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(libc.info.gz) Concepts of Job Control

(libc.info.gz) Job Control

(libc.info.gz) Controlling Terminal