Date: Fri, 12 Mar 2004 21:01:59 -0500 From: "Justin Baugh" <justin.baugh@corp.request.com> To: <freebsd-questions@freebsd.org> Subject: Pernicious problem with vfork / qmail / qmail-scanner (more) Message-ID: <20040313015900.0837343D39@mx1.FreeBSD.org>
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This is a multi-part message in MIME format. ------=_NextPart_000_0027_01C40875.429A70B0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit I did some testing. I wrote a small program in C to fork off a specified number of processes and leave them there. I find that I can run exactly 39 processes as qmaild before tcpserver begins to barf, saying it cannot fork. This makes no sense to me; I can fork off hundreds of processes as the qmaild user with my simple test program (running as sudo -U qmaild). However, tcpserver, no matter what I do, is locked to 40 total children processes. I find that value very interesting because during my research I noticed that there is a #define in sys/syslimits.h defining CHILD_MAX as 40 if it is not already defined. And it seems as though you can set it as a kernel option in 4.x but not in 5.x....Could this be related? I'm confused because it doesn't look like tcpserver relies on syslimits or anything which would get that limit...any ideas? Thanks, -Justin ------=_NextPart_000_0027_01C40875.429A70B0 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIM4jCCArcw ggIgAgEAMA0GCSqGSIb3DQEBBAUAMIGjMQswCQYDVQQGEwJFUzESMBAGA1UECBMJQkFSQ0VMT05B MRIwEAYDVQQHEwlCQVJDRUxPTkExGTAXBgNVBAoTEElQUyBTZWd1cmlkYWQgQ0ExGDAWBgNVBAsT D0NlcnRpZmljYWNpb25lczEXMBUGA1UEAxMOSVBTIFNFUlZJRE9SRVMxHjAcBgkqhkiG9w0BCQEW D2lwc0BtYWlsLmlwcy5lczAeFw05ODAxMDEyMzIxMDdaFw0wOTEyMjkyMzIxMDdaMIGjMQswCQYD VQQGEwJFUzESMBAGA1UECBMJQkFSQ0VMT05BMRIwEAYDVQQHEwlCQVJDRUxPTkExGTAXBgNVBAoT EElQUyBTZWd1cmlkYWQgQ0ExGDAWBgNVBAsTD0NlcnRpZmljYWNpb25lczEXMBUGA1UEAxMOSVBT IFNFUlZJRE9SRVMxHjAcBgkqhkiG9w0BCQEWD2lwc0BtYWlsLmlwcy5lczCBnzANBgkqhkiG9w0B AQEFAAOBjQAwgYkCgYEArE9SdJ856o7cJcS8mF2YZCQJPCGzzBm1jpSOh9H4Nz6hyC1YpIA1W6F1 bB1FDB9hY2peb5sKTMHIuGEjNYH//qx4cC1o4ToHmJUCVN3NI7eAU9fIN0VyBiQSuhNhIYpudSjg 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