POSIX system(3) 调用异步 shell 命令会立即返回吗? [英] Will POSIX system(3) call to an asynchronous shell command return immediately?

问题描述

例如，system("sh/mydir/some-script.sh &")

推荐答案

system("sh /mydir/some-script.sh &")

执行

/bin/sh -c 'sh /mydir/some-script.sh &'

system 将在外壳返回后立即返回，这将在启动内外壳后立即返回.两个 shell 都不会等待 some-script.sh 完成.

system will return as soon as outer shell returns, which will be immediately after it launches the inner shell. Neither shell will wait for some-script.sh to finish.

$ cat some-script.sh
sleep 1
echo foo

$ /bin/sh -c 'sh some-script.sh &' ; echo bar ; sleep 2
bar
foo

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