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ID Category Severity Type Date Submitted Last Update
0000276 [1003.1(2008)/Issue 7] System Interfaces Comment Clarification Requested 2010-07-02 15:56 2011-06-23 15:32
Reporter fahree View Status public  
Assigned To
Priority normal Resolution Rejected  
Status Closed  
Name Francois-Rene Rideau
Organization
User Reference
Section (section number or name, can be interface name)
Page Number (page or range of pages)
Line Number (Line or range of lines)
Interp Status ---
Final Accepted Text
Summary 0000276: declare vfork as async signal safe
Description Since fork calls pthread_atfork handlers and cannot be async signal safe, could vfork be declared async signal safe, and could it be declared that between vfork and exec, any other async signal safe function could be called?

That would allow for posix_spawn and extensions thereof to be implemented in terms of vfork.
Desired Action Declare vfork async signal safe.
Declare that in the vfork'ed process, any async signal safe function can be called.
Tags No tags attached.
Attached Files

- Relationships
related to 0000062Appliedajosey Is it correct to list fork as an async-signal safe interface 

-  Notes
(0000456)
fahree (reporter)
2010-07-02 15:56

 Related to issues 18 and 62.
(0000458)
geoffclare (manager)
2010-07-08 09:20
edited on: 2010-07-29 15:22

 There is no vfork() function in the current standard.
(0000477)
fahree (reporter)
2010-07-29 15:25

 It's of course OK if you ultimately decide to reject the issue, but could you at least include a rationale or explanation or note as to why the issue doesn't need be solved?
(0000478)
fahree (reporter)
2010-07-29 15:26

 Note: vfork could be added back to the standard, in a way that is trivially backward compatible with previous standards and common practice.
(0000479)
fahree (reporter)
2010-07-29 15:27

 The issue being: fork does no more do some of the things it used to do, and there is currently no valid replacement for it in those contexts.
(0000528)
geoffclare (manager)
2010-08-19 15:39
edited on: 2010-08-19 15:41

 The vfork() function had heavy restrictions on the child process.
Quoting SUSv3:

   the behavior is undefined if the process created by vfork() either
   modifies any data other than a variable of type pid_t used to store
   the return value from vfork(), or returns from the function in
   which vfork() was called, or calls any other function before
   successfully calling _exit() or one of the exec family of
   functions.

Therefore it is not a suitable solution to the issue of fork()
async-signal-safety. The solution the group has decided to adopt is
to add an _Fork() function in the next revision, as per 0000062

- Issue History
Date Modified Username Field Change
2010-07-02 15:56 fahree New Issue
2010-07-02 15:56 fahree Name => Francois-Rene Rideau
2010-07-02 15:56 fahree Note Added: 0000456
2010-07-08 09:20 geoffclare Note Added: 0000458
2010-07-16 21:07 msbrown Project Aardvark Bugs => 1003.1(2008)/Issue 7
2010-07-29 15:02 msbrown Section => (section number or name, can be interface name)
2010-07-29 15:02 msbrown Page Number => (page or range of pages)
2010-07-29 15:02 msbrown Line Number => (Line or range of lines)
2010-07-29 15:02 msbrown Interp Status => ---
2010-07-29 15:02 msbrown Category Aardvark Mk III => System Interfaces
2010-07-29 15:21 msbrown Resolution Open => Rejected
2010-07-29 15:22 geoffclare Note Edited: 0000458
2010-07-29 15:23 msbrown Status New => Closed
2010-07-29 15:25 fahree Note Added: 0000477
2010-07-29 15:25 fahree Status Closed => Under Review
2010-07-29 15:25 fahree Resolution Rejected => Reopened
2010-07-29 15:26 fahree Note Added: 0000478
2010-07-29 15:27 fahree Note Added: 0000479
2010-08-12 21:42 ldwyer Issue Monitored: ldwyer
2010-08-19 15:39 geoffclare Note Added: 0000528
2010-08-19 15:40 geoffclare Resolution Reopened => Rejected
2010-08-19 15:41 nick Relationship added related to 0000062
2010-08-19 15:41 geoffclare Note Edited: 0000528
2011-06-23 15:32 msbrown Status Under Review => Closed

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