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patches/glibc/ports-2.10.1/500-alpha-add-getsystats-support.patch
author "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Tue Dec 13 23:32:39 2011 +0100 (2011-12-13)
branch1.13
changeset 2847 c0bf2319af08
permissions -rw-r--r--
scripts: fix dumping execution backtrace

Dumping the backtrace has been broken since changeset #652e56d6d35a:
scripts: execute each steps in a subshell

We can spawn sub-sub-shells in some cases.

The way the fault handler works is to dump the backtrace, but to avoid
printing it once for every sub-shell (which could get quite confusing),
it simply exits when it detects that it is being run in a sub-shell,
leaving to the top-level shell the work to dump the backtrace.

Because each step is executed in its own sub-shell, the variable arrays
that contain the step name, the source file and line number, are lost
when exiting the per-step sub-shell.

Hence, the backtrace is currently limited to printing only the top-level
main procedure of the shell.

Fix this thus:
- when dumping the bckatraces for the steps & the functions, remember
it was dumped, and only dump it if it was not already dumped
- at the top-level shell, print the hints

Also, rename the top-level step label.

Reported-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
(transplanted from 4193d6e6a17430a177fa88c287879c2c35e319f3) 
     1 2009-05-16  Aurelien Jarno  <aurelien@aurel32.net>

     2 

     3         * sysdeps/unix/sysv/linux/alpha/getsysstats.c (GET_NPROCS_PARSER):

     4         Change parameters and use next_line.

     5 

     6  ports/sysdeps/unix/sysv/linux/alpha/getsysstats.c |    5 +++--

     7  1 file changed, 3 insertions(+), 2 deletions(-)

     8 

     9 diff -durN glibc-2.10.1.orig/glibc-ports-2.10.1/sysdeps/unix/sysv/linux/alpha/getsysstats.c glibc-2.10.1/glibc-ports-2.10.1/sysdeps/unix/sysv/linux/alpha/getsysstats.c

    10 --- glibc-2.10.1.orig/glibc-ports-2.10.1/sysdeps/unix/sysv/linux/alpha/getsysstats.c	2009-05-16 10:36:20.000000000 +0200

    11 +++ glibc-2.10.1/glibc-ports-2.10.1/sysdeps/unix/sysv/linux/alpha/getsysstats.c	2009-11-13 00:51:07.000000000 +0100

    12 @@ -20,15 +20,16 @@

    13  

    14  

    15  /* We need to define a special parser for /proc/cpuinfo.  */

    16 -#define GET_NPROCS_PARSER(FP, BUFFER, RESULT)				   \

    17 +#define GET_NPROCS_PARSER(FD, BUFFER, CP, RE, BUFFER_END, RESULT)	   \

    18    do									   \

    19      {									   \

    20        /* Find the line that contains the information about the number of   \

    21  	 active cpus.  We don't have to fear extremely long lines since	   \

    22  	 the kernel will not generate them.  8192 bytes are really enough. \

    23  	 If there is no "CPUs ..." line then we are on a UP system.  */	   \

    24 +      char *l;								   \

    25        (RESULT) = 1;							   \

    26 -      while (fgets_unlocked (BUFFER, sizeof (BUFFER), FP) != NULL)	   \

    27 +      while ((l = next_line (FD, BUFFER, &CP, &RE, BUFFER_END)) != NULL)  \

    28  	if ((sscanf (BUFFER, "cpus active : %d", &(RESULT)) == 1)	   \

    29  	    || (sscanf (BUFFER, "CPUs probed %*d active %d",		   \

    30  			&(RESULT)) == 1))  				   \

    31 diff -durN glibc-2.10.1.orig/ports/sysdeps/unix/sysv/linux/alpha/getsysstats.c glibc-2.10.1/ports/sysdeps/unix/sysv/linux/alpha/getsysstats.c
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