29 lines
1.2 KiB
Plaintext
29 lines
1.2 KiB
Plaintext
2012-05-02 cgf-000001
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<1.7.15>
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Fix problem setting parent pid to 1 when process with children execs
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itself. Fixes: http://cygwin.com/ml/cygwin/2012-05/msg00009.html
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</1.7.15>
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Investigating this problem with strace showed that ssh-agent was
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checking the parent pid and getting a 1 when it shouldn't have. Other
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stuff looked ok so I chose to consider this a smoking gun.
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Going back to the version that the OP said did not have the problem, I
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worked forward until I found where the problem first occurred -
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somewhere around 2012-03-19. And, indeed, the getppid call returned the
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correct value in the working version. That means that this stopped
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working when I redid the way the process pipe was inherited around
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this time period.
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It isn't clear why (and I suspect I may have to debug this further at
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some poit) this hasn't always been a problem but I made the obvious fix.
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We shouldn't have been setting ppid = 1 when we're about to pass off to
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an execed process.
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As I was writing this, I realized that it was necessary to add some
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additional checks. Just checking for "have_execed" isn't enough. If
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we've execed a non-cygwin process then it won't know how to deal with
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any inherited children. So, always set ppid = 1 if we've execed a
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non-cygwin process.
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