strace cann't trace time() system call on x86_64

[ChenJingPiao]

Version:strace-4.14, strace-4.13, strace-4.5.20 Environment: ubuntu 16.04.1 LTS x86_64 I use strace to trace a program with time() system call, but it not print time() system call. I also do the same test on ubuntu 14.04 LTS i386, it can trace time() system call. I can find the time() system in strace-4.14/linux/x86_64/syscallent.h and strace-4.14/linux/dummy.h. So I think it may be a bug and report it.Thank you. test program: test.c #include <stdlib.h> #include <time.h> int main() { 	time_t t; 	t = time(NULL); 	return 0; } $strace -o output.txt ./test output.txt: execve("./a.out", ["./a.out"], [/* 72 vars */]) = 0 brk(NULL)                               = 0xb5c000 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) = 0x7f2284ddc000 access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory) open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=112807, ...}) = 0 mmap(NULL, 112807, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f2284dc0000 close(3)                                = 0 access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory) open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P\t\2\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=1864888, ...}) = 0 mmap(NULL, 3967488, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f22847f0000 mprotect(0x7f22849b0000, 2093056, PROT_NONE) = 0 mmap(0x7f2284baf000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1bf000) = 0x7f2284baf000 mmap(0x7f2284bb5000, 14848, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f2284bb5000 close(3)                                = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f2284dbf000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f2284dbe000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f2284dbd000 arch_prctl(ARCH_SET_FS, 0x7f2284dbe700) = 0 mprotect(0x7f2284baf000, 16384, PROT_READ) = 0 mprotect(0x600000, 4096, PROT_READ)     = 0 mprotect(0x7f2284dde000, 4096, PROT_READ) = 0 munmap(0x7f2284dc0000, 112807)          = 0 exit_group(0)                           = ? +++ exited with 0 +++ $strace -e time ./test only print: +++ exited with 0 +++ This is my first time send email to mail list, if something wrong, please point it out. Thank you.
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