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From "Jie Yu (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (MESOS-1197) Adding signal safe os::system
Date Tue, 08 Apr 2014 18:17:17 GMT

     [ https://issues.apache.org/jira/browse/MESOS-1197?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jie Yu reassigned MESOS-1197:
-----------------------------

    Assignee: Jie Yu

> 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
>            Assignee: 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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