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Postings from April 2010
Leon Timmermans <fawaka@gmail.com> writes: > On Mon, Apr 19, 2010 at 7:02 PM, Maik Hentsche <maik@mm-double.de> wrote: >> Hi, >> I was recently confused by the way signal handlers using wait() behave >> in collaboration with qx() or system(). >> >> When you have a signal handler for SIGCHLD that calls wait() and use >> qx() or system() in your parent, the signal handler will be called. >> Yet, because qx/system already wait()ed for their child the wait in the >> signal handler would block. I doubt everyone will understand this in >> the first place. Thus, I wrote an improvement for the documentation to >> tell people about this issue. Please find the patch attached. It >> applies to the current git HEAD. >> > > Mentioning a problem is a good start, but what I'm missing is how to > deal with this. That is far more valuable (and probably more > complicated to do in a portable manner). For me who was also hit by this the mentioning would have already helped a lot. How to solve the problem was discussed (here?) some months ago and it was kind of consensus that it's a natural problem that needs not to be “fixed”. So at least targeting the possible confusion sounds ok to me. > Also, adding it three times may be an overkill. Personally don't > think adding it to the system() documentation too adds much. You > shouldn't be thinking about this when using system(), you should > when using wait() IMO. Agreed. Steffen -- Steffen Schwigon <ss5@renormalist.net>Thread Previous | Thread Next