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Clash Royale CLAN TAG #URR8PPP up vote 2 down vote favorite I have tried to hook system calls using linux kernel module. However, when I open a pdf file using Evince, I find no open , read and write is used on this specific file, only lstat is used. Here is the strace log of strace evince folder1/test.pdf So I wonder what system call does evince use to open and read from file? ubuntu linux-kernel system-calls read evince share | improve this question asked Nov 23 at 1:00 user6456568 20 3 2 Try strace with the -f (follow) option, since the clone call creates a subprocess. – Thomas Dickey Nov 23 at 1:24 @ThomasDickey Thanks, I've updated the log in the link. Now I can see open("/home/xytao/folder1/test.pdf", O_RDONLY) in line 5376, but I still don't see read , maybe because it's using pread ? – user6456568 Nov 23 at 1:36 perhaps the socket I/O is what's doing it - or pread