Syscall Used by fopen()
Question Text
Use strace
to determine the syscall called by fopen()
to access the file.
Which one is it?
Question Answers
read()
openat()
write()
fstat()
Feedaback
student@os:~/.../lab/support/simple-file-handling$ strace ./file_operations
[...]
openat(AT_FDCWD, "file.txt", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0664, st_size=11, ...}) = 0
read(3, "C was here!", 4096) = 11
[...]
So fopen()
's (main) underlying syscall is openat()
.