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Top Forums Programming "No child processes" and waitpif Post 302299567 by Corona688 on Friday 20th of March 2009 11:30:50 AM
Old 03-20-2009
Quote:
Originally Posted by Zipi
Besides,i have read Motif Programming Manual (Volume 6A): 26 - Signal Handling,which explains how to safely handle signals in a motif application by adding a safe handler (i am working in X11 R7.1.1,so fortunately i can use the simpler X11R6 approach).
I don't see anything special about that code at all. It's just setting up a signal handler, not going about it in any special "safe" way. I think they mean motif-compatible, not 'safe' in any general sense.
Quote:
I am thinking of moving all the "dirty" stuff to this safe handler function (with dirty i mean everything that's not allowed in a handler function).Do you think that's ok?
Is it safe to do non-signal-safe things in a signal handler? No.
Quote:
2)What do you think of the traceLog function? Can it be called from the signal handler?
Depends what it does and how it does it.
 

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semanage_iterate(3)					   Libsemanage API documentation				       semanage_iterate(3)

NAME
semanage_iterate - SELinux Management API SYNOPSIS
The following iterate function is supported for any semanage record. Replace the function and object name as necessary. extern int ITERATE_FUNCTION ( semanage_handle_t *handle, int (*handler) ( const semanage_OBJECT_t *object, void *varg), void *handler_arg); DESCRIPTION
Behavior: The iterate function will execute the specified handler over all objects in the selected location. An arbitrary argument can be passed into the handler function along with each object. The object passed in is property of the libsemanage library, and may not be modified or preserved - use semanage_OBJECT_clone if that is necessary. The handler code may not invoke any semanage write requests for the same object type (i.e. modifying the underlying store is not allowed). The iterate function is reentrant only while inside a transaction (see semanage_begin_transaction ). It is not safe to execute other semanage read or write requests within iterate if not inside a transaction. The handler may return -1 to signal error exit, 0 to signal continue, and 1 to signal successful exit early (the iterate function will stop accordingly). Parameters: The handle is used to track persistent state across semanage calls, and for error reporting. The handler is the function to execute, with handler_arg as its second parameter, and each object as its first parameter. Requirements: This function requires an semanage connection to be established (see semanage_connect(3) ) RETURN VALUE
In case of failure, -1 is returned, and the semanage error callback is invoked, describing the error. Otherwise a non-negative integer is returned (a commit number). The same number will be returned by all other semanage object read calls until the next commit. SEE ALSO
semanage_handle_create(3), semanage_connect(3), ivg2@cornell.edu 15 March 2006 semanage_iterate(3)
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