136 lines
2.8 KiB
Forth
136 lines
2.8 KiB
Forth
# System Interaction
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The `unix:` namespace contains words for interacting with the
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host operating system on Unix style systems.
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~~~
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{{
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'Unix var
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:identify
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@Unix n:zero? 0; drop
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#8 io:scan-for dup n:negative?
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[ drop 'IO_DEVICE_TYPE_0008_NOT_FOUND s:put nl ]
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[ !Unix ] choose ;
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---reveal---
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:io:unix-syscall identify @Unix io:invoke ;
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}}
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~~~
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`unix:system` runs another application using the system shell
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and returns after execution is completed.
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~~~
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:unix:system (s-) #0 io:unix-syscall ;
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~~~
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`unix:fork` forks the current process and returns a process
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identifier.
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~~~
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:unix:fork (-n) #1 io:unix-syscall ;
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~~~
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This group is used to execute a new process in place of the
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current one. These take a program and optionally 1-3 arguments.
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They map to the execl() system call.
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Example:
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'/usr/bin/cal '2 '2019 unix:exec2
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~~~
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:unix:exec0 (s-) #2 io:unix-syscall ;
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:unix:exec1 (ss-) #3 io:unix-syscall ;
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:unix:exec2 (sss-) #4 io:unix-syscall ;
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:unix:exec3 (ssss-) #5 io:unix-syscall ;
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~~~
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`unix:exit` takes a return code and exits RRE, returning the
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specified code.
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~~~
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:unix:exit (n-) #6 io:unix-syscall ;
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~~~
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`unix:getpid` returns the current process identifier.
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~~~
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:unix:getpid (-n) #7 io:unix-syscall ;
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~~~
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`unix:wait` waits for a child process to complete. This maps to
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the wait() system call.
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~~~
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:unix:wait (-n) #8 io:unix-syscall ;
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~~~
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`unix:kill` terminates a process. Takes a process and a signal
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to send.
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~~~
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:unix:kill (nn-) #9 io:unix-syscall ;
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~~~
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The next two words allow opening and closing pipes. The first,
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`unix:popen` takes the name of a program and a file mode and
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returns a file handle usable with words in the `file:` namespace.
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The second, `unix:pclose` closes the pipe.
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~~~
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:unix:popen (sn-n) #10 io:unix-syscall ;
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:unix:pclose (n-) #11 io:unix-syscall ;
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~~~
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`unix:chdir` changes the current working directory to the
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specified one.
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~~~
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:unix:chdir (s-) #13 io:unix-syscall ;
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~~~
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~~~
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:unix:getenv (sa-) #14 io:unix-syscall ;
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:unix:putenv (s-) #15 io:unix-syscall ;
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~~~
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`unix:sleep` pauses execution for the specified number of
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seconds.
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~~~
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:unix:sleep (n-) #16 io:unix-syscall ;
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~~~
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~~~
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(s-s) :unix:pipe
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file:R unix:popen &file:read-line &unix:pclose bi ;
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~~~
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~~~
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(-s) :unix:get-cwd
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'pwd unix:pipe s:trim '/ s:append ;
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~~~
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~~~
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(-n) :unix:count-files-in-cwd
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'ls_-1_|_wc_-l unix:pipe s:trim s:to-number ;
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~~~
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~~~
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(q-) :unix:for-each-file (q-)
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'ls_-1_-p file:R unix:popen
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unix:count-files-in-cwd
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[ [ file:read-line s:temp over call ] sip ] times
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unix:pclose drop ;
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~~~
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~~~
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{{
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:start swap buffer:set file:R unix:popen ;
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:read dup file:read dup buffer:add n:zero? ;
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:finish unix:pclose buffer:size ;
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---reveal---
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:unix:slurp-pipe (as-n)
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[ start &read until finish ] buffer:preserve ;
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}}
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~~~
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