On 5/15/15, Bart Van Assche <bvanass...@acm.org> wrote: > Hello Dixon, > > Can you provide more information about which Net-SNMP version has been > tested, which steps were followed to download the source code and can > you also provide the output for the T009large_fd_set_clib unit test ? > > Thanks, > > Bart. > >
Hello Bart, We are using NetSNMP release 5.7.3. Source is downloaded from sourceforge: http://sourceforge.net/projects/net-snmp/files/net-snmp/5.7.3/net-snmp-5.7.3.tar.gz/download We didn't have the Test::Harness perl module installed, so we compiled the T009large_fd_set_clib unit test manually with adding required headers/macros. And all the tests passed - with and without patch - even with original version - 5.7.3 release. We suspect the problem is not using large_fd_set apis, but using FD_* macros for fds set with LFD_*. As we previously pointed out, these are our observations: In Linux X64, sys/select.h: ... typedef long int __fd_mask; ... #define __NFDBITS (8 * sizeof (__fd_mask)) ... typedef struct { ... __fd_mask __fds_bits[__FD_SETSIZE / __NFDBITS]; ... } fd_set; ... In HP-UX IA64, /usr/include/sys/_fd_macros.h: ... typedef int32_t __fd_mask; ... #define _NFDBITS (sizeof(__fd_mask) * 8) /* 8 bits per byte * ... #define __howmany(x,y) (((x)+((y)-1))/(y)) ... typedef struct __fd_set { long fds_bits[__howmany(FD_SETSIZE, (sizeof(long) * 8))]; } fd_set; ... #ifdef _INCLUDE_HPUX_SOURCE # define FD_SET(n,p) (((__fd_mask *)((p)->fds_bits))[(n)/_NFDBITS] |= (1 << ((n) % _NFDBITS))) # define FD_CLR(n,p) (((__fd_mask *)((p)->fds_bits))[(n)/_NFDBITS] &= ~(1 << ((n) % _NFDBITS))) # define FD_ISSET(n,p) (((__fd_mask *)((p)->fds_bits))[(n)/_NFDBITS] & (1 << ((n) % _NFDBITS))) # define FD_ZERO(p) memset((void *)(p), (int) 0, sizeof(*(p))) #else ... Please note, in HP-UX, fd_bits is an array of long(64 bit) and __fd_mask is still 32 bit. So, on the platform in 64 bit mode, For fd=0, bit 32 of fd_bits[0] need to be set (or, will be set by FD_SET) But, LFD_SET macro will set bit 0 of fd_bits[0] So, this causes issue when select (which uses system's LD_* macros) uses fds returned by snmp_select_info(which uses custom LFD_* routines). Please let us know if you need any further details. Regards, Dixon Xavier ------------------------------------------------------------------------------ One dashboard for servers and applications across Physical-Virtual-Cloud Widest out-of-the-box monitoring support with 50+ applications Performance metrics, stats and reports that give you Actionable Insights Deep dive visibility with transaction tracing using APM Insight. http://ad.doubleclick.net/ddm/clk/290420510;117567292;y _______________________________________________ Net-snmp-coders mailing list Net-snmp-coders@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/net-snmp-coders
