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Test Your Knowledge in Computers #946
Difficulty: Medium
A ping flood attack is a simple DOS attack where the attacker overwhelms the victim with TCP echo request packets.
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sched_getcpu(3) [opensolaris man page]

SCHED_GETCPU(3) 					     Linux Programmer's Manual						   SCHED_GETCPU(3)

sched_getcpu - determine CPU on which the calling thread is running SYNOPSIS
#include <sched.h> int sched_getcpu(void); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): sched_getcpu(): Since glibc 2.14: _GNU_SOURCE Before glibc 2.14: _BSD_SOURCE || _SVID_SOURCE /* _GNU_SOURCE also suffices */ DESCRIPTION
sched_getcpu() returns the number of the CPU on which the calling thread is currently executing. RETURN VALUE
On success, sched_getcpu() returns a nonnegative CPU number. On error, -1 is returned and errno is set to indicate the error. ERRORS
ENOSYS This kernel does not implement getcpu(2). VERSIONS
This function is available since glibc 2.6. ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +---------------+---------------+---------+ |Interface | Attribute | Value | +---------------+---------------+---------+ |sched_getcpu() | Thread safety | MT-Safe | +---------------+---------------+---------+ CONFORMING TO
sched_getcpu() is glibc-specific. NOTES
The call cpu = sched_getcpu(); is equivalent to the following getcpu(2) call: int c, s; s = getcpu(&c, NULL, NULL); cpu = (s == -1) ? s : c; SEE ALSO
getcpu(2), sched(7) COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at Linux 2017-09-15 SCHED_GETCPU(3)

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