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Diffstat (limited to 'Doc/Zsh')
| -rw-r--r-- | Doc/Zsh/jobs.yo | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/Doc/Zsh/jobs.yo b/Doc/Zsh/jobs.yo index 0369e9745..3baf77f20 100644 --- a/Doc/Zsh/jobs.yo +++ b/Doc/Zsh/jobs.yo @@ -37,6 +37,22 @@ when it is typed. A job being run in the background will suspend if it tries to read from the terminal. + +Note that if the job running in the foreground is a shell function, +then suspending it will have the effect of causing the shell to fork. +This is necessary to separate the function's state from that of the +parent shell performing the job control, so that the latter can return +to the command line prompt. As a result, even if tt(fg) is +used to continue the job the function will no longer be part of the +parent shell, and any variables set by the function will not be visible +in the parent shell. Thus the behaviour is different from the case +where the function was never suspended. Zsh is different from many +other shells in this regard. + +The same behaviour is found when the shell is executing code as the +right hand side of a pipeline or any complex shell construct such as +tt(if), tt(for), etc., in order that the entire block of code +can be managed as a single job. cindex(background jobs, I/O) cindex(jobs, background, I/O) Background jobs are normally allowed to produce output, |