popen(), system(), etc and multithreading

[Andy Tai]

Hi, in glibc-2.2-based (GNU/)Linux systems, is it safe
to call popen() or system() from a thread in a
multi-threaded program?  Does this impact other
threads of the same process?  Is this not recommended?
 If this is safe, can I count on the same behavior on
other Unix systems?

Thanks for any info.

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