[jira] [Created] (MESOS-1197) Adding signal safe os::system

["Jie Yu (JIRA)" <ji...@apache.org>]

Jie Yu created MESOS-1197:
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             Summary: Adding signal safe os::system
                 Key: MESOS-1197
                 URL: https://issues.apache.org/jira/browse/MESOS-1197
             Project: Mesos
          Issue Type: Task
            Reporter: Jie Yu


There exist a few scenarios in which we need to execute a shell command inside the child context (has to be signal safe). For example, in this review:
https://reviews.apache.org/r/20026/

However, the existing os::system is not async signal safe because ::system is not async signal safe. The main issue is because ::system has to deal with signal semantics:

{noformat}
The system() function hands the argument command to the command interpreter sh(1). The calling process waits for the shell to finish executing the command, ignoring SIGINT and SIGQUIT, and blocking SIGCHLD.
{noformat}

We have two options here:

1) make the existing os::system signal safe, but it's semantics will be slightly different from ::system

2) add a new function: os::safeSystem

Let me know your thoughts!



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