On page 73, he has put down 2 lines of code that we can use to use
the open system call without explicit library support. The book reads
"Placing this macro in an application is all that is required to use
the open() system call". I have used these 2 lines in my code as
follows:
#define __NR_open 5
_syscall3(long, open, const char *, filename, int, flags, int, mode)
int main()
{
long ret;
ret = open("/root/tmp", 02, 00700);
return ret;
}
However i get this when compiling:
# gcc syscall_open.c
syscall_open.c:3: parse error before "open"
syscall_open.c: In function `_syscall3':
syscall_open.c:6: parse error before '{' token
syscall_open.c:6: declaration for parameter `main' but no such parameter
What am I doing wrong?
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