I can't find it in kernel source with global ptrace
, there is no definition in kernel/ptrace.c like it was stated in man page..... I can see kernel/ptrace.c and include/linux/ptrace.h but there is nothing
You need to look for it in your libc source code, for example glibc or musl . And notice what does it say in man ptrace
under NOTES
section:
Although arguments to ptrace() are interpreted according to the prototype given, glibc currently declares ptrace() as a variadic function with only the request argument fixed. It is recommended to always supply four arguments, even if the requested operation does not use them, setting unused/ignored arguments to 0L or (void *) 0.
In glibc
for example ptrace()
is defined in sysdeps/unix/sysv/linux/ptrace.c
:
long int
ptrace (enum __ptrace_request request, ...)
{
long int res, ret;
va_list ap;
pid_t pid;
void *addr, *data;
va_start (ap, request);
pid = va_arg (ap, pid_t);
addr = va_arg (ap, void *);
data = va_arg (ap, void *);
va_end (ap);
if (request > 0 && request < 4)
data = &ret;
res = INLINE_SYSCALL (ptrace, 4, request, pid, addr, data);
if (res >= 0 && request > 0 && request < 4)
{
__set_errno (0);
return ret;
}
return res;
}
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