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UGU: Unix Guru Universe - Unix Tip #4487- June 24, 2025
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Unix Tip #4487- June 24, 2025
GETTING MORE FROM SIGSEGV
For those who want to get
more info on SIGSEGV for
your application in Linux,
you can use the following
command "catchsegv".
for eg: consider the program (a.c)
main()
{
char *p = 0;
*p = 'a';
}
$cc a.c
$catchsegv a.out #produces the following output
*** Segmentation fault
Register dump:
EAX: 00000000 EBX: 4010e1ec ECX: 08048398 EDX: 4010f098
ESI: 4000ae60 EDI: bffffafc EBP: bffffab0 ESP: bffffaac
EIP: 080483a8 EFLAGS: 00010296
CS: 0023 DS: 002b ES: 002b FS: 0000 GS: 0000 SS: 002b
Trap: 0000000e Error: 00000006 OldMask: 00000000
ESP/signal: bffffaac CR2: 00000000
FPUCW: ffff037f FPUSW: ffff0000 TAG: ffffffff
IPOFF: 00000000 CSSEL: 0000 DATAOFF: 0000ffff DATASEL:
0000
ST(0) 0000 0000000000000000 ST(1) 0000 cf118de5ab2a5800
ST(2) 0000 feb02a6c405d9ad4 ST(3) 0000 0000000000000000
ST(4) 0000 8000000000000000 ST(5) 0000 8000000000000000
ST(6) 0000 0000000000000000 ST(7) 0000 847fffdee0000848
Backtrace:
/usr/src/bs/BUILD/glibc-2.1.3/csu/init.c:0(??)[0x80483a8]
/lib/libc.so.6(__libc_start_main+0xff)[0x400369cb]
??:0(_start)[0x8048311]
"csv" 25L, 860C
NOTE: All tips provided are USE AT YOUR OWN RISK. Tips are submitted
by various unix admins around the globe. UGU suggest you read and
test each tip in a non-volitile environment before placing into
production.
LAST 5 TIPS
4486
- ANOTHER UPPER TO LOWER
4485
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4484
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4483
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4482
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