75 lines
1.8 KiB
V
75 lines
1.8 KiB
V
module main
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import os
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// this is a example script to show you stdin can be used and keep a process open
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fn exec(cmd string) (string, int) {
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mut cmd2 := cmd
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mut out := ''
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mut line := ''
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mut rc := 0
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mut p := os.new_process('/bin/bash')
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// there are methods missing to know if stderr/stdout has data as such its better to redirect bot on same FD
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// not so nice trick to run bash in bash and redirect stderr, maybe someone has a better solution
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p.set_args(['-c', 'bash 2>&1'])
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p.set_redirect_stdio()
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p.run()
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p.stdin_write('$cmd2 && echo **OK**')
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os.fd_close(p.stdio_fd[0]) // important: close stdin so cmd can end by itself
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for p.is_alive() {
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line = p.stdout_read()
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println(line)
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// line_err = p.stderr_read() //IF WE CALL STDERR_READ will block
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// we need a mechanism which allows us to check if stderr/stdout has data or it should never block
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// is not a good way, need to use a string buffer, is slow like this
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out += line
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if line.ends_with('**OK**\n') {
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out = out[0..(out.len - 7)]
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break
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}
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}
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// println("read from stdout, should not block")
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// is not really needed but good test to see behaviour
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out += p.stdout_read()
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println('read done')
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println(p.stderr_read())
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p.close()
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p.wait()
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if p.code > 0 {
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rc = 1
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println('ERROR:')
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println(cmd2)
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print(out)
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}
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return out, rc
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}
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fn main() {
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mut out := ''
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mut rc := 0
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// find files from /tmp excluding files unlistable by current user
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out, rc = exec("find /tmp/ -user \$UID; echo '******'")
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println(out)
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assert out.ends_with('******\n')
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out, rc = exec('echo to stdout')
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assert out.contains('to stdout')
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out, rc = exec('echo to stderr 1>&2')
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assert out.contains('to stderr')
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out, rc = exec('ls /sssss')
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assert rc > 0 // THIS STILL GIVES AN ERROR !
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println('test ok stderr & stdout is indeed redirected')
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}
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