Date: Sun, 21 Nov 2004 13:29:06 -0500 (EST) From: Derek Tattersall <dlt@mebtel.net> To: current@FreeBSD.org Subject: Error in write to named pipe Message-ID: <200411211829.iALIT6Vi001024@lorne.arm.org>
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I have an application that reads a file and writes some lines to a
named pipe. It's just a sigmonster. On a current kernel/world from
11/11 the signature gets created and written to the pipe quite
nicely. On a kernel/world from this morning (1600 GMT) the app fails
to write the signature.
The pipe and write portion of the ktrace is as follows:
929 signature CALL fork
929 signature RET fork 930/0x3a2
929 signature CALL exit(0)
931 signature RET open 3
931 signature CALL pipe
931 signature RET pipe 4
931 signature CALL fork
931 signature RET fork 959/0x3bf
931 signature CALL wait4(0x3bf,0,0,0)
931 signature RET wait4 959/0x3bf
931 signature CALL close(0x5)
931 signature RET close 0
931 signature CALL read(0x4,0xbfbfdbd4,0x200)
931 signature GIO fd 4 read 64 bytes
"Don't abandon hope: your Tom Mix decoder ring arrives tomorrow.
"
931 signature RET read 64/0x40
931 signature CALL close(0x4)
931 signature RET close 0
931 signature CALL __sysctl(0xbfbfd1f0,0x2,0xbfbfd630,0xbfbfd1ec,0,0)
931 signature RET __sysctl 0
931 signature CALL __sysctl(0xbfbfd1f0,0x2,0xbfbfd730,0xbfbfd1ec,0,0)
931 signature RET __sysctl 0
931 signature CALL __sysctl(0xbfbfd1f0,0x2,0xbfbfd830,0xbfbfd1ec,0,0)
931 signature RET __sysctl 0
931 signature CALL __sysctl(0xbfbfd1f0,0x2,0xbfbfd930,0xbfbfd1ec,0,0)
931 signature RET __sysctl 0
931 signature CALL __sysctl(0xbfbfd1f0,0x2,0xbfbfda30,0xbfbfd1ec,0,0)
931 signature RET __sysctl 0
931 signature CALL write(0x3,0xbfbfe3d4,0xad)
931 signature RET write -1 errno 45 Operation not supported
931 signature CALL close(0x3)
931 signature RET close 0
931 signature CALL nanosleep(0xbfbfdb38,0xbfbfdb30)
931 signature RET nanosleep 0
931 signature CALL access(0x804b220,0)
931 signature NAMI "/home/dlt/.signature"
931 signature RET access 0
931 signature CALL open(0x804b220,0x1,0x400)
931 signature NAMI "/home/dlt/.signature"
Why would write suddenly be returning "operation not supported" when
it's to a pipe?
--
Derek Tattersall dlt@mebtel.net dlt666@yahoo.com
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