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$ strace ./tcpmodbus
execve("./tcpmodbus", ["./tcpmodbus"], [/* 37 vars */]) = 0
brk(0) = 0x22c0000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x7fa2f5c05000
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or
directory)
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x7fa2f5c03000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or
directory)
open("/etc/ld.so.cache", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=113018, ...}) = 0
mmap(NULL, 113018, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fa2f5be7000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or
directory)
open("/lib/libpthread.so.0", O_RDONLY) = 3
read(3,
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\340X
\0\0\0\0\0\0"...,
832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=131174, ...}) = 0
mmap(NULL, 2208640, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0x7fa2f57cc000
mprotect(0x7fa2f57e3000, 2093056, PROT_NONE) = 0
mmap(0x7fa2f59e2000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x16000) = 0x7fa2f59e2000
mmap(0x7fa2f59e4000, 13184, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fa2f59e4000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or
directory)
open("/lib/libc.so.6", O_RDONLY) = 3
read(3,
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\320\
353\1\0\0\0\0\0"...,
832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1490312, ...}) = 0
mmap(NULL, 3598344, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0x7fa2f545d000
mprotect(0x7fa2f55c3000, 2093056, PROT_NONE) = 0
mmap(0x7fa2f57c2000, 20480, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x165000) = 0x7fa2f57c2000
mmap(0x7fa2f57c7000, 18440, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fa2f57c7000
close(3) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x7fa2f5be6000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x7fa2f5be5000
arch_prctl(ARCH_SET_FS, 0x7fa2f5be56f0) = 0
mprotect(0x7fa2f57c2000, 16384, PROT_READ) = 0
mprotect(0x7fa2f59e2000, 4096, PROT_READ) = 0
mprotect(0x603000, 4096, PROT_READ) = 0
mprotect(0x7fa2f5c06000, 4096, PROT_READ) = 0
munmap(0x7fa2f5be7000, 113018) = 0
set_tid_address(0x7fa2f5be57c0) = 18558
set_robust_list(0x7fa2f5be57d0, 0x18) = 0
futex(0x7fffa268381c, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x7fffa268381c, 0x189 /* FUTEX_??? */, 1, NULL, 7fa2f5be56f0) = -1
EAGAIN (Resource temporarily unavailable)
rt_sigaction(SIGRTMIN, {0x7fa2f57d1760, [], SA_RESTORER|SA_SIGINFO,
0x7fa2f57db190}, NULL, 8) = 0
rt_sigaction(SIGRT_1, {0x7fa2f57d17f0, [],
SA_RESTORER|SA_RESTART|SA_SIGINFO, 0x7fa2f57db190}, NULL, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0
getrlimit(RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM_INFINITY}) = 0
socket(PF_INET, SOCK_STREAM, IPPROTO_TCP) = 3
bind(3, {sa_family=AF_INET, sin_port=htons(502),
sin_addr=inet_addr("0.0.0.0")}, 16) = -1 EACCES (Permission denied)
write(2, "Bind socket failed.\r\n", 21Bind socket failed.
) = 21
write(2, "freemodbus: can't initialize mod"..., 44freemodbus: can't
initialize modbus stack!
) = 44
exit_group(1) = ?