Date: Sat, 14 May 2016 11:58:17 +0100 From: Matthew Seaman <matthew@FreeBSD.org> To: freebsd-questions@freebsd.org Subject: Re: Shell script ignoring / blocking signals Message-ID: <030404da-2588-05c5-00fa-a2b6c32856b1@FreeBSD.org> In-Reply-To: <000b01d1ad50$2a928790$7fb796b0$@ymail.com> References: <000b01d1ad50$2a928790$7fb796b0$@ymail.com>
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This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --v71fu2DcPiNGi1m7I81pQsPcMKLsxPb2b Content-Type: multipart/mixed; boundary="16S99fgHUg7TROXENvuAbrEQgLNePRX0A" From: Matthew Seaman <matthew@FreeBSD.org> To: freebsd-questions@freebsd.org Message-ID: <030404da-2588-05c5-00fa-a2b6c32856b1@FreeBSD.org> Subject: Re: Shell script ignoring / blocking signals References: <000b01d1ad50$2a928790$7fb796b0$@ymail.com> In-Reply-To: <000b01d1ad50$2a928790$7fb796b0$@ymail.com> --16S99fgHUg7TROXENvuAbrEQgLNePRX0A Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable On 13/05/2016 20:46, Andrew Wood via freebsd-questions wrote: > If I run the script directly everything works fine, but if the script i= s run > from inside another shell script the signals are blocked (set to ignore= ) as > indicated by procstat. > Can someone please explain to me why this is happening and how I unbloc= k > them? Hmmm... There was a problem with signal masks being propagated across exec() call for a while, right around the time 10.3-RELEASE was happening. This is where the problem was fixed for STABLE-10: https://svnweb.freebsd.org/base?view=3Drevision&revision=3D297789 and here for 10.3-RELEASE: https://svnweb.freebsd.org/base?view=3Drevision&revision=3D297204 For this to bite you, you'ld need to be running a version of the OS with an affected version of tcsh, and your shell needs to be descended from a tcsh process somehow (remember that tcsh is root's default shell, so this is more common than you might think.) Cheers, Matthew --16S99fgHUg7TROXENvuAbrEQgLNePRX0A-- --v71fu2DcPiNGi1m7I81pQsPcMKLsxPb2b Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQJ8BAEBCgBmBQJXNwTPXxSAAAAAAC4AKGlzc3Vlci1mcHJAbm90YXRpb25zLm9w ZW5wZ3AuZmlmdGhob3JzZW1hbi5uZXQ2NTNBNjhCOTEzQTRFNkNGM0UxRTEzMjZC QjIzQUY1MThFMUE0MDEzAAoJELsjr1GOGkATq44QAJVUXJuSvJvQYW9pMnTHWH1f UJC/B09iEfwQI22+Ag++XZOska7xpjQI2XAEeEg5lG0S5FJpxSPvUN8N7lnZ35GD o+qxG4K6I1ttwlTjUh22X2cnWomYdbBQK0dvYSiUsmUoaMRceh6nZJ0d21JCbxyi 9jgkHR11tdFRph7xI84BM+wU4Ks6LZc9fBjyc0qLxFXPxUXx3y41WfN5vjT10aou UKaMNC2N+s4sBQXJLLIzhFIZABpLxyHNdUVb7vyFqgnK2VbznIw9HzyuWKNOTMKv DydHEZxkD+AUWFmEOIDpXjf0J9zYLlhwbDYUsupjcBEuG60gIjtTWka8NlDlecS5 gjWDBqk+PHU65crsr6xOXPAgpKpIVB4enVXV2QOKAj9cvgeL5t9QRbNOKy2hk9Da xDN95flI/tUVrla7zOpCyL2blXGPoShMkclNApy7aimo/kRE0oGRaJgvTXD+076q NPmUDVNIDHtQlbybKuGtRMAv5jA494aWlU8FvFGbi46kB/rVa2GgwGN0vleHSoem ncaIEAN8l7hBzDd8/wGpbTYIPT82mlUJjy1/qz6dAV6eQi1zj711ma0Lc2OK04Yi a7+PxNR4dRV4bmqU/kSJSIzb0qL6s+FR4S+khC4xhVASsyQDZSkyQ66vNoC6fRZ8 f/85fRd7JdDHFLiFyXZL =TKFb -----END PGP SIGNATURE----- --v71fu2DcPiNGi1m7I81pQsPcMKLsxPb2b--
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