That's my output for strace ngrep. I am afraid i am unable to interpret it.
root@ludmila:~# strace ngrep
execve("/bin/ngrep", ["ngrep"], [/* 30 vars */]) = 0
uname({sys="Linux", node="ludmila", ...}) = 0
fcntl64(0, F_GETFD) = 0
fcntl64(1, F_GETFD) = 0
fcntl64(2, F_GETFD) = 0
geteuid32() = 0
getuid32() = 0
getegid32() = 0
getgid32() = 0
brk(0) = 0x80d9d8c
brk(0x80dad8c) = 0x80dad8c
brk(0x80db000) = 0x80db000
open("/dev/urandom", O_RDONLY) = 3
read(3, "qG\\-\2575[\27\'\267\251\310\23\226!\310\250\361\35jf\327"..., 32) = 32
close(3) = 0
rt_sigaction(SIGINT, {0x8049fd0, [INT], SA_RESTORER|SA_RESTART,
0x8062dd8}, {SIG_DFL}, 8) = 0
rt_sigaction(SIGQUIT, {0x8049fd0, [QUIT], SA_RESTORER|SA_RESTART,
0x8062dd8}, {SIG_DFL}, 8) = 0
rt_sigaction(SIGABRT, {0x8049fd0, [ABRT], SA_RESTORER|SA_RESTART,
0x8062dd8}, {SIG_DFL}, 8) = 0
rt_sigaction(SIGPIPE, {0x8049fd0, [PIPE], SA_RESTORER|SA_RESTART,
0x8062dd8}, {SIG_DFL}, 8) = 0
rt_sigaction(SIGWINCH, {0x8049dd0, [WINCH], SA_RESTORER|SA_RESTART,
0x8062dd8}, {SIG_DFL}, 8) = 0
socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 3
ioctl(3, SIOCGIFCONF, 0xbffff090) = 0
ioctl(3, SIOCGIFCONF, 0xbffff090) = 0
ioctl(3, SIOCGIFFLAGS, 0x80da078) = 0
ioctl(3, SIOCGIFNETMASK, 0x80da078) = 0
ioctl(3, SIOCGIFBRDADDR, 0x80da078) = 0
ioctl(3, SIOCGIFFLAGS, 0x80da098) = 0
ioctl(3, SIOCGIFNETMASK, 0x80da098) = 0
ioctl(3, SIOCGIFBRDADDR, 0x80da098) = 0
ioctl(3, SIOCGIFFLAGS, 0x80da0b8) = 0
ioctl(3, SIOCGIFNETMASK, 0x80da0b8) = 0
ioctl(3, SIOCGIFBRDADDR, 0x80da0b8) = 0
ioctl(3, SIOCGIFFLAGS, 0x80da0d8) = 0
ioctl(3, SIOCGIFNETMASK, 0x80da0d8) = 0
ioctl(3, SIOCGIFBRDADDR, 0x80da0d8) = 0
ioctl(3, SIOCGIFFLAGS, 0x80da0f8) = 0
ioctl(3, SIOCGIFNETMASK, 0x80da0f8) = 0
ioctl(3, SIOCGIFBRDADDR, 0x80da0f8) = 0
close(3) = 0
socket(PF_PACKET, SOCK_RAW, 768) = 3
ioctl(3, SIOCGIFINDEX, 0xbfffedf0) = 0
ioctl(3, SIOCGIFHWADDR, 0xbfffedf0) = 0
ioctl(3, SIOCGIFINDEX, 0xbfffedf0) = 0
bind(3, {sa_family=AF_PACKET, proto=0x03, if1, pkttype=PACKET_HOST,
addr(0)={0, }, 20) = 0
getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0
setsockopt(3, SOL_PACKET, PACKET_ADD_MEMBERSHIP,
"\1\0\0\0\2\0\0\0\0\0\0\0\0\0\0\0", 16) = 0
close(3) = 0
socket(PF_PACKET, SOCK_RAW, 768) = 3
ioctl(3, SIOCGIFINDEX, 0xbfffedf0) = 0
ioctl(3, SIOCGIFHWADDR, 0xbfffedf0) = 0
ioctl(3, SIOCGIFINDEX, 0xbfffedf0) = 0
bind(3, {sa_family=AF_PACKET, proto=0x03, if3, pkttype=PACKET_HOST,
addr(0)={0, }, 20) = 0
getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0
setsockopt(3, SOL_PACKET, PACKET_ADD_MEMBERSHIP,
"\3\0\0\0\2\0\0\0\0\0\0\0\0\0\0\0", 16) = 0
close(3) = 0
socket(PF_PACKET, SOCK_RAW, 768) = 3
ioctl(3, SIOCGIFINDEX, 0xbfffedf0) = 0
ioctl(3, SIOCGIFHWADDR, 0xbfffedf0) = 0
ioctl(3, SIOCGIFINDEX, 0xbfffedf0) = 0
bind(3, {sa_family=AF_PACKET, proto=0x03, if3, pkttype=PACKET_HOST,
addr(0)={0, }, 20) = 0
getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0
setsockopt(3, SOL_PACKET, PACKET_ADD_MEMBERSHIP,
"\3\0\0\0\2\0\0\0\0\0\0\0\0\0\0\0", 16) = 0
close(3) = 0
socket(PF_PACKET, SOCK_RAW, 768) = 3
ioctl(3, SIOCGIFINDEX, 0xbfffedf0) = 0
ioctl(3, SIOCGIFHWADDR, 0xbfffedf0) = 0
ioctl(3, SIOCGIFINDEX, 0xbfffedf0) = 0
bind(3, {sa_family=AF_PACKET, proto=0x03, if3, pkttype=PACKET_HOST,
addr(0)={0, }, 20) = 0
getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0
setsockopt(3, SOL_PACKET, PACKET_ADD_MEMBERSHIP,
"\3\0\0\0\2\0\0\0\0\0\0\0\0\0\0\0", 16) = 0
close(3) = 0
socket(PF_PACKET, SOCK_RAW, 768) = 3
ioctl(3, SIOCGIFINDEX, 0xbfffedf0) = 0
ioctl(3, SIOCGIFHWADDR, 0xbfffedf0) = 0
ioctl(3, SIOCGIFINDEX, 0xbfffedf0) = 0
bind(3, {sa_family=AF_PACKET, proto=0x03, if4, pkttype=PACKET_HOST,
addr(0)={0, }, 20) = 0
getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0
setsockopt(3, SOL_PACKET, PACKET_ADD_MEMBERSHIP,
"\4\0\0\0\2\0\0\0\0\0\0\0\0\0\0\0", 16) = 0
close(3) = 0
socket(PF_PACKET, SOCK_DGRAM, 768) = 3
ioctl(3, SIOCGIFINDEX, 0xbfffee20) = 0
close(3) = 0
socket(PF_PACKET, SOCK_RAW, 768) = 3
ioctl(3, SIOCGIFINDEX, 0xbfffeed0) = 0
ioctl(3, SIOCGIFHWADDR, 0xbfffeed0) = 0
ioctl(3, SIOCGIFINDEX, 0xbfffeed0) = 0
bind(3, {sa_family=AF_PACKET, proto=0x03, if3, pkttype=PACKET_HOST,
addr(0)={0, }, 20) = 0
getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0
setsockopt(3, SOL_PACKET, PACKET_ADD_MEMBERSHIP,
"\3\0\0\0\1\0\0\0\0\0\0\0\0\0\0\0", 16) = 0
brk(0x80eb000) = 0x80eb000
socket(PF_FILE, SOCK_STREAM, 0) = 4
connect(4, {sa_family=AF_FILE, path="/var/run/.nscd_socket"}, 110) =
-1 ENOENT (No such file or directory)
close(4) = 0
open("/etc/nsswitch.conf", O_RDONLY) = 4
fstat64(4, {st_mode=S_IFREG|0644, st_size=1083, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0x40000000
read(4, "#\n# /etc/nsswitch.conf\n#\n# An ex"..., 4096) = 1083
read(4, "", 4096) = 0
close(4) = 0
munmap(0x40000000, 4096) = 0
open("/etc/ld.so.cache", O_RDONLY) = 4
fstat64(4, {st_mode=S_IFREG|0644, st_size=46459, ...}) = 0
mmap2(NULL, 46459, PROT_READ, MAP_PRIVATE, 4, 0) = 0x40000000
close(4) = 0
open("/lib/libnss_compat.so.2", O_RDONLY) = 4
read(4, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0P\22\0\000"...,
1024) = 1024
fstat64(4, {st_mode=S_IFREG|0755, st_size=34422, ...}) = 0
mmap2(NULL, 32012, PROT_READ|PROT_EXEC, MAP_PRIVATE, 4, 0) = 0x4000c000
mprotect(0x40013000, 3340, PROT_NONE) = 0
mmap2(0x40013000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED,
4, 0x6) = 0x40013000
close(4) = 0
open("/lib/libnsl.so.1", O_RDONLY) = 4
read(4, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0p<\0\000"...,
1024) = 1024
fstat64(4, {st_mode=S_IFREG|0755, st_size=87560, ...}) = 0
brk(0x80ec000) = 0x80ec000
mmap2(NULL, 85088, PROT_READ|PROT_EXEC, MAP_PRIVATE, 4, 0) = 0x40014000
mprotect(0x40026000, 11360, PROT_NONE) = 0
mmap2(0x40026000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED,
4, 0x11) = 0x40026000
mmap2(0x40027000, 7264, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x40027000
close(4) = 0
open("/lib/libc.so.6", O_RDONLY) = 4
read(4, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\320U\1"...,
1024) = 1024
fstat64(4, {st_mode=S_IFREG|0755, st_size=1330257, ...}) = 0
mmap2(NULL, 1138532, PROT_READ|PROT_EXEC, MAP_PRIVATE, 4, 0) = 0x40029000
mprotect(0x40135000, 40804, PROT_NONE) = 0
mmap2(0x40135000, 32768, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED,
4, 0x10c) = 0x40135000
mmap2(0x4013d000, 8036, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x4013d000
close(4) = 0
open("/lib/ld-linux.so.2", O_RDONLY) = 4
read(4, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0@\t\0\000"...,
1024) = 1024
fstat64(4, {st_mode=S_IFREG|0755, st_size=96817, ...}) = 0
mmap2(NULL, 84060, PROT_READ|PROT_EXEC, MAP_PRIVATE, 4, 0) = 0x4013f000
mprotect(0x40153000, 2140, PROT_NONE) = 0
mmap2(0x40153000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED,
4, 0x14) = 0x40153000
close(4) = 0
munmap(0x40000000, 46459) = 0
brk(0) = 0x80ec000
brk(0x810d000) = 0x810d000
open("/etc/nsswitch.conf", O_RDONLY) = 4
fstat64(4, {st_mode=S_IFREG|0644, st_size=1083, ...}) = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
-1, 0) = 0x40000000
read(4, "#\n# /etc/nsswitch.conf\n#\n# An ex"..., 4096) = 1083
read(4, "", 4096) = 0
close(4) = 0
munmap(0x40000000, 4096) = 0
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
+++ killed by SIGSEGV +++
On Thu, 28 Oct 2004 13:50:58 +0530, Rajsekar
<raj--cutme--sekar@xxxxxxxxxxxxxxxxxxxxxxxx> wrote:
> You could try
>
> $ strace ngrep
>
> It might give you more info (example the library that is causing the
> problem).
>
> --
> Rajsekar
>
>
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