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strace -t getent hosts baidu.com(default setting)
$ strace -t getent hosts baidu.com
21:13:09 execve("/usr/bin/getent", ["getent", "hosts", "baidu.com"], [/* 29 vars */]) = 0
21:13:09 brk(0) = 0x1168000
21:13:09 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f779687f000
21:13:09 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
21:13:09 open("/etc/ld.so.cache", O_RDONLY) = 3
21:13:09 fstat(3, {st_mode=S_IFREG|0644, st_size=68446, ...}) = 0
21:13:09 mmap(NULL, 68446, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f779686e000
21:13:09 close(3) = 0
21:13:09 open("/lib64/libc.so.6", O_RDONLY) = 3
21:13:09 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\360\355\241\2618\0\0\0"..., 832) = 832
21:13:09 fstat(3, {st_mode=S_IFREG|0755, st_size=1979000, ...}) = 0
21:13:09 mmap(0x38b1a00000, 3803304, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x38b1a00000
21:13:09 mprotect(0x38b1b97000, 2097152, PROT_NONE) = 0
21:13:09 mmap(0x38b1d97000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x197000) = 0x38b1d97000
21:13:09 mmap(0x38b1d9c000, 18600, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x38b1d9c000
21:13:09 close(3) = 0
21:13:09 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f779686d000
21:13:09 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f779686c000
21:13:09 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f779686b000
21:13:09 arch_prctl(ARCH_SET_FS, 0x7f779686c700) = 0
21:13:09 mprotect(0x605000, 4096, PROT_READ) = 0
21:13:09 mprotect(0x38b1d97000, 16384, PROT_READ) = 0
21:13:09 mprotect(0x38b141f000, 4096, PROT_READ) = 0
21:13:09 munmap(0x7f779686e000, 68446) = 0
21:13:09 brk(0) = 0x1168000
21:13:09 brk(0x1189000) = 0x1189000
21:13:09 open("/usr/lib/locale/locale-archive", O_RDONLY) = 3
21:13:09 fstat(3, {st_mode=S_IFREG|0644, st_size=99158704, ...}) = 0
21:13:09 mmap(NULL, 99158704, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f77909da000
21:13:09 close(3) = 0
21:13:09 getpid() = 194642
21:13:09 open("/etc/resolv.conf", O_RDONLY) = 3
21:13:09 fstat(3, {st_mode=S_IFREG|0644, st_size=160, ...}) = 0
21:13:09 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f779687e000
21:13:09 read(3, "search umops.us\nnameserver 1.1.1"..., 4096) = 160
21:13:09 read(3, "", 4096) = 0
21:13:09 close(3) = 0
21:13:09 munmap(0x7f779687e000, 4096) = 0
21:13:09 socket(PF_FILE, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 3
21:13:09 connect(3, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
21:13:09 close(3) = 0
21:13:09 socket(PF_FILE, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 3
21:13:09 connect(3, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
21:13:09 close(3) = 0
21:13:09 open("/etc/nsswitch.conf", O_RDONLY) = 3
21:13:09 fstat(3, {st_mode=S_IFREG|0644, st_size=1688, ...}) = 0
21:13:09 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f779687e000
21:13:09 read(3, "#\n# /etc/nsswitch.conf\n#\n# An ex"..., 4096) = 1688
21:13:09 read(3, "", 4096) = 0
21:13:09 close(3) = 0
21:13:09 munmap(0x7f779687e000, 4096) = 0
21:13:09 open("/etc/ld.so.cache", O_RDONLY) = 3
21:13:09 fstat(3, {st_mode=S_IFREG|0644, st_size=68446, ...}) = 0
21:13:09 mmap(NULL, 68446, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f779686e000
21:13:09 close(3) = 0
21:13:09 open("/lib64/libnss_files.so.2", O_RDONLY) = 3
21:13:09 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\360!\0\0\0\0\0\0"..., 832) = 832
21:13:09 fstat(3, {st_mode=S_IFREG|0755, st_size=65928, ...}) = 0
21:13:09 mmap(NULL, 2151824, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f77907cc000
21:13:09 mprotect(0x7f77907d8000, 2097152, PROT_NONE) = 0
21:13:09 mmap(0x7f77909d8000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xc000) = 0x7f77909d8000
21:13:09 close(3) = 0
21:13:09 mprotect(0x7f77909d8000, 4096, PROT_READ) = 0
21:13:09 munmap(0x7f779686e000, 68446) = 0
21:13:09 open("/etc/host.conf", O_RDONLY) = 3
21:13:09 fstat(3, {st_mode=S_IFREG|0644, st_size=9, ...}) = 0
21:13:09 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f779687e000
21:13:09 read(3, "multi on\n", 4096) = 9
21:13:09 read(3, "", 4096) = 0
21:13:09 close(3) = 0
21:13:09 munmap(0x7f779687e000, 4096) = 0
21:13:09 open("/etc/hosts", O_RDONLY|O_CLOEXEC) = 3
21:13:09 fcntl(3, F_GETFD) = 0x1 (flags FD_CLOEXEC)
21:13:09 fstat(3, {st_mode=S_IFREG|0644, st_size=98, ...}) = 0
21:13:09 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f779687e000
21:13:09 read(3, "127.0.0.1 \t\tlocalhost.localdom"..., 4096) = 98
21:13:09 read(3, "", 4096) = 0
21:13:09 close(3) = 0
21:13:09 munmap(0x7f779687e000, 4096) = 0
21:13:09 open("/etc/ld.so.cache", O_RDONLY) = 3
21:13:09 fstat(3, {st_mode=S_IFREG|0644, st_size=68446, ...}) = 0
21:13:09 mmap(NULL, 68446, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f779686e000
21:13:09 close(3) = 0
21:13:09 open("/lib64/libnss_dns.so.2", O_RDONLY) = 3
21:13:09 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\20\0\0\0\0\0\0"..., 832) = 832
21:13:09 fstat(3, {st_mode=S_IFREG|0755, st_size=27424, ...}) = 0
21:13:09 mmap(NULL, 2117880, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f77905c6000
21:13:09 mprotect(0x7f77905cb000, 2093056, PROT_NONE) = 0
21:13:09 mmap(0x7f77907ca000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x4000) = 0x7f77907ca000
21:13:09 close(3) = 0
21:13:09 open("/lib64/libresolv.so.2", O_RDONLY) = 3
21:13:09 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\00009\20096\0\0\0"..., 832) = 832
21:13:09 fstat(3, {st_mode=S_IFREG|0755, st_size=113952, ...}) = 0
21:13:09 mmap(0x3639800000, 2202248, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x3639800000
21:13:09 mprotect(0x3639816000, 2097152, PROT_NONE) = 0
21:13:09 mmap(0x3639a16000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x16000) = 0x3639a16000
21:13:09 mmap(0x3639a18000, 6792, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x3639a18000
21:13:09 close(3) = 0
21:13:09 mprotect(0x3639a16000, 4096, PROT_READ) = 0
21:13:09 mprotect(0x7f77907ca000, 4096, PROT_READ) = 0
21:13:09 munmap(0x7f779686e000, 68446) = 0
21:13:09 socket(PF_INET, SOCK_DGRAM|SOCK_NONBLOCK, IPPROTO_IP) = 3
21:13:09 connect(3, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("1.1.1.1")}, 16) = 0
21:13:09 poll([{fd=3, events=POLLOUT}], 1, 0) = 1 ([{fd=3, revents=POLLOUT}])
21:13:09 sendto(3, "V\272\1\0\0\1\0\0\0\0\0\0\5baidu\3com\0\0\34\0\1", 27, MSG_NOSIGNAL, NULL, 0) = 27
21:13:09 poll([{fd=3, events=POLLIN}], 1, 5000) = 0 (Timeout)
21:13:14 socket(PF_INET, SOCK_DGRAM|SOCK_NONBLOCK, IPPROTO_IP) = 4
21:13:14 connect(4, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("2.2.2.2")}, 16) = 0
21:13:14 poll([{fd=4, events=POLLOUT}], 1, 0) = 1 ([{fd=4, revents=POLLOUT}])
21:13:14 sendto(4, "V\272\1\0\0\1\0\0\0\0\0\0\5baidu\3com\0\0\34\0\1", 27, MSG_NOSIGNAL, NULL, 0) = 27
21:13:14 poll([{fd=4, events=POLLIN}], 1, 3000) = 0 (Timeout)
21:13:17 socket(PF_INET, SOCK_DGRAM|SOCK_NONBLOCK, IPPROTO_IP) = 5
21:13:17 connect(5, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("3.3.3.3")}, 16) = 0
21:13:17 poll([{fd=5, events=POLLOUT}], 1, 0) = 1 ([{fd=5, revents=POLLOUT}])
21:13:17 sendto(5, "V\272\1\0\0\1\0\0\0\0\0\0\5baidu\3com\0\0\34\0\1", 27, MSG_NOSIGNAL, NULL, 0) = 27
21:13:17 poll([{fd=5, events=POLLIN}], 1, 6000) = 0 (Timeout)
21:13:23 poll([{fd=3, events=POLLOUT}], 1, 0) = 1 ([{fd=3, revents=POLLOUT}])
21:13:23 sendto(3, "V\272\1\0\0\1\0\0\0\0\0\0\5baidu\3com\0\0\34\0\1", 27, MSG_NOSIGNAL, NULL, 0) = 27
21:13:23 poll([{fd=3, events=POLLIN}], 1, 5000) = 0 (Timeout)
21:13:28 poll([{fd=4, events=POLLOUT}], 1, 0) = 1 ([{fd=4, revents=POLLOUT}])
21:13:28 sendto(4, "V\272\1\0\0\1\0\0\0\0\0\0\5baidu\3com\0\0\34\0\1", 27, MSG_NOSIGNAL, NULL, 0) = 27
21:13:28 poll([{fd=4, events=POLLIN}], 1, 3000) = 0 (Timeout)
21:13:31 poll([{fd=5, events=POLLOUT}], 1, 0) = 1 ([{fd=5, revents=POLLOUT}])
21:13:31 sendto(5, "V\272\1\0\0\1\0\0\0\0\0\0\5baidu\3com\0\0\34\0\1", 27, MSG_NOSIGNAL, NULL, 0) = 27
21:13:31 poll([{fd=5, events=POLLIN}], 1, 6000) = 0 (Timeout)
21:13:37 close(3) = 0
21:13:37 close(4) = 0
21:13:37 close(5) = 0
21:13:37 socket(PF_INET, SOCK_DGRAM|SOCK_NONBLOCK, IPPROTO_IP) = 3
21:13:37 connect(3, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("1.1.1.1")}, 16) = 0
21:13:37 poll([{fd=3, events=POLLOUT}], 1, 0) = 1 ([{fd=3, revents=POLLOUT}])
21:13:37 sendto(3, "\261\240\1\0\0\1\0\0\0\0\0\0\5baidu\3com\5umops\2us\0"..., 36, MSG_NOSIGNAL, NULL, 0) = 36
21:13:37 poll([{fd=3, events=POLLIN}], 1, 5000) = 0 (Timeout)
21:13:42 socket(PF_INET, SOCK_DGRAM|SOCK_NONBLOCK, IPPROTO_IP) = 4
21:13:42 connect(4, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("2.2.2.2")}, 16) = 0
21:13:42 poll([{fd=4, events=POLLOUT}], 1, 0) = 1 ([{fd=4, revents=POLLOUT}])
21:13:42 sendto(4, "\261\240\1\0\0\1\0\0\0\0\0\0\5baidu\3com\5umops\2us\0"..., 36, MSG_NOSIGNAL, NULL, 0) = 36
21:13:42 poll([{fd=4, events=POLLIN}], 1, 3000) = 0 (Timeout)
21:13:45 socket(PF_INET, SOCK_DGRAM|SOCK_NONBLOCK, IPPROTO_IP) = 5
21:13:45 connect(5, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("3.3.3.3")}, 16) = 0
21:13:45 poll([{fd=5, events=POLLOUT}], 1, 0) = 1 ([{fd=5, revents=POLLOUT}])
21:13:45 sendto(5, "\261\240\1\0\0\1\0\0\0\0\0\0\5baidu\3com\5umops\2us\0"..., 36, MSG_NOSIGNAL, NULL, 0) = 36
21:13:45 poll([{fd=5, events=POLLIN}], 1, 6000) = 0 (Timeout)
21:13:51 poll([{fd=3, events=POLLOUT}], 1, 0) = 1 ([{fd=3, revents=POLLOUT}])
21:13:51 sendto(3, "\261\240\1\0\0\1\0\0\0\0\0\0\5baidu\3com\5umops\2us\0"..., 36, MSG_NOSIGNAL, NULL, 0) = 36
21:13:51 poll([{fd=3, events=POLLIN}], 1, 5000) = 0 (Timeout)
21:13:56 poll([{fd=4, events=POLLOUT}], 1, 0) = 1 ([{fd=4, revents=POLLOUT}])
21:13:56 sendto(4, "\261\240\1\0\0\1\0\0\0\0\0\0\5baidu\3com\5umops\2us\0"..., 36, MSG_NOSIGNAL, NULL, 0) = 36
21:13:56 poll([{fd=4, events=POLLIN}], 1, 3000) = 0 (Timeout)
21:13:59 poll([{fd=5, events=POLLOUT}], 1, 0) = 1 ([{fd=5, revents=POLLOUT}])
21:13:59 sendto(5, "\261\240\1\0\0\1\0\0\0\0\0\0\5baidu\3com\5umops\2us\0"..., 36, MSG_NOSIGNAL, NULL, 0) = 36
21:13:59 poll([{fd=5, events=POLLIN}], 1, 6000) = 0 (Timeout)
21:14:05 close(3) = 0
21:14:05 close(4) = 0
21:14:05 close(5) = 0
21:14:05 open("/etc/hosts", O_RDONLY|O_CLOEXEC) = 3
21:14:05 fstat(3, {st_mode=S_IFREG|0644, st_size=98, ...}) = 0
21:14:05 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f779687e000
21:14:05 read(3, "127.0.0.1 \t\tlocalhost.localdom"..., 4096) = 98
21:14:05 read(3, "", 4096) = 0
21:14:05 close(3) = 0
21:14:05 munmap(0x7f779687e000, 4096) = 0
21:14:05 socket(PF_INET, SOCK_DGRAM|SOCK_NONBLOCK, IPPROTO_IP) = 3
21:14:05 connect(3, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("1.1.1.1")}, 16) = 0
21:14:05 poll([{fd=3, events=POLLOUT}], 1, 0) = 1 ([{fd=3, revents=POLLOUT}])
21:14:05 sendto(3, "\267\257\1\0\0\1\0\0\0\0\0\0\5baidu\3com\0\0\1\0\1", 27, MSG_NOSIGNAL, NULL, 0) = 27
21:14:05 poll([{fd=3, events=POLLIN}], 1, 5000) = 0 (Timeout)
21:14:10 socket(PF_INET, SOCK_DGRAM|SOCK_NONBLOCK, IPPROTO_IP) = 4
21:14:10 connect(4, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("2.2.2.2")}, 16) = 0
21:14:10 poll([{fd=4, events=POLLOUT}], 1, 0) = 1 ([{fd=4, revents=POLLOUT}])
21:14:10 sendto(4, "\267\257\1\0\0\1\0\0\0\0\0\0\5baidu\3com\0\0\1\0\1", 27, MSG_NOSIGNAL, NULL, 0) = 27
21:14:10 poll([{fd=4, events=POLLIN}], 1, 3000) = 0 (Timeout)
21:14:13 socket(PF_INET, SOCK_DGRAM|SOCK_NONBLOCK, IPPROTO_IP) = 5
21:14:13 connect(5, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("3.3.3.3")}, 16) = 0
21:14:13 poll([{fd=5, events=POLLOUT}], 1, 0) = 1 ([{fd=5, revents=POLLOUT}])
21:14:13 sendto(5, "\267\257\1\0\0\1\0\0\0\0\0\0\5baidu\3com\0\0\1\0\1", 27, MSG_NOSIGNAL, NULL, 0) = 27
21:14:13 poll([{fd=5, events=POLLIN}], 1, 6000) = 0 (Timeout)
21:14:19 poll([{fd=3, events=POLLOUT}], 1, 0) = 1 ([{fd=3, revents=POLLOUT}])
21:14:19 sendto(3, "\267\257\1\0\0\1\0\0\0\0\0\0\5baidu\3com\0\0\1\0\1", 27, MSG_NOSIGNAL, NULL, 0) = 27
21:14:19 poll([{fd=3, events=POLLIN}], 1, 5000) = 0 (Timeout)
21:14:24 poll([{fd=4, events=POLLOUT}], 1, 0) = 1 ([{fd=4, revents=POLLOUT}])
21:14:24 sendto(4, "\267\257\1\0\0\1\0\0\0\0\0\0\5baidu\3com\0\0\1\0\1", 27, MSG_NOSIGNAL, NULL, 0) = 27
21:14:24 poll([{fd=4, events=POLLIN}], 1, 3000^@) = 0 (Timeout)
21:14:27 poll([{fd=5, events=POLLOUT}], 1, 0) = 1 ([{fd=5, revents=POLLOUT}])
21:14:27 sendto(5, "\267\257\1\0\0\1\0\0\0\0\0\0\5baidu\3com\0\0\1\0\1", 27, MSG_NOSIGNAL, NULL, 0) = 27
21:14:27 poll([{fd=5, events=POLLIN}], 1, 6000) = 0 (Timeout)
21:14:33 close(3) = 0
21:14:33 close(4) = 0
21:14:33 close(5) = 0
21:14:33 socket(PF_INET, SOCK_DGRAM|SOCK_NONBLOCK, IPPROTO_IP) = 3
21:14:33 connect(3, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("1.1.1.1")}, 16) = 0
21:14:33 poll([{fd=3, events=POLLOUT}], 1, 0) = 1 ([{fd=3, revents=POLLOUT}])
21:14:33 sendto(3, "\276`\1\0\0\1\0\0\0\0\0\0\5baidu\3com\5umops\2us\0"..., 36, MSG_NOSIGNAL, NULL, 0) = 36
21:14:33 poll([{fd=3, events=POLLIN}], 1, 5000) = 0 (Timeout)
21:14:38 socket(PF_INET, SOCK_DGRAM|SOCK_NONBLOCK, IPPROTO_IP) = 4
21:14:38 connect(4, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("2.2.2.2")}, 16) = 0
21:14:38 poll([{fd=4, events=POLLOUT}], 1, 0) = 1 ([{fd=4, revents=POLLOUT}])
21:14:38 sendto(4, "\276`\1\0\0\1\0\0\0\0\0\0\5baidu\3com\5umops\2us\0"..., 36, MSG_NOSIGNAL, NULL, 0) = 36
21:14:38 poll([{fd=4, events=POLLIN}], 1, 3000) = 0 (Timeout)
21:14:41 socket(PF_INET, SOCK_DGRAM|SOCK_NONBLOCK, IPPROTO_IP) = 5
21:14:41 connect(5, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("3.3.3.3")}, 16) = 0
21:14:41 poll([{fd=5, events=POLLOUT}], 1, 0) = 1 ([{fd=5, revents=POLLOUT}])
21:14:41 sendto(5, "\276`\1\0\0\1\0\0\0\0\0\0\5baidu\3com\5umops\2us\0"..., 36, MSG_NOSIGNAL, NULL, 0) = 36
21:14:41 poll([{fd=5, events=POLLIN}], 1, 6000) = 0 (Timeout)
21:14:47 poll([{fd=3, events=POLLOUT}], 1, 0) = 1 ([{fd=3, revents=POLLOUT}])
21:14:47 sendto(3, "\276`\1\0\0\1\0\0\0\0\0\0\5baidu\3com\5umops\2us\0"..., 36, MSG_NOSIGNAL, NULL, 0) = 36
21:14:47 poll([{fd=3, events=POLLIN}], 1, 5000) = 0 (Timeout)
21:14:52 poll([{fd=4, events=POLLOUT}], 1, 0) = 1 ([{fd=4, revents=POLLOUT}])
21:14:52 sendto(4, "\276`\1\0\0\1\0\0\0\0\0\0\5baidu\3com\5umops\2us\0"..., 36, MSG_NOSIGNAL, NULL, 0) = 36
21:14:52 poll([{fd=4, events=POLLIN}], 1, 3000) = 0 (Timeout)
21:14:55 poll([{fd=5, events=POLLOUT}], 1, 0) = 1 ([{fd=5, revents=POLLOUT}])
21:14:55 sendto(5, "\276`\1\0\0\1\0\0\0\0\0\0\5baidu\3com\5umops\2us\0"..., 36, MSG_NOSIGNAL, NULL, 0) = 36
21:14:55 poll([{fd=5, events=POLLIN}], 1, 6000) = 0 (Timeout)
21:15:01 close(3) = 0
21:15:01 close(4) = 0
21:15:01 close(5) = 0
21:15:01 exit_group(2) = ?
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