Provided by: liboping-dev_1.10.0-1build1_amd64 
NAME
ping_setopt - Set options for a liboping object
SYNOPSIS
#include <oping.h>
int ping_setopt (pingobj_t *obj, int opt, void *val);
DESCRIPTION
The ping_setopt method sets options that apply to all hosts associated with the object obj and hosts that
are yet to be added to the object.
The obj argument is a pointer to an liboping object, as returned by ping_construct(3).
The opt argument specifies the option to set. Use one of the following constants. You can check if the
required constant is supported by the library at compile time using "#ifdef". It is recommended to check
for desired features using the "OPING_VERSION" define.
PING_OPT_TIMEOUT
The time to wait for a "echo reply" to be received; in seconds. In this case the memory pointed to by
val is interpreted as a double value and must be greater than zero. The default is PING_DEF_TIMEOUT.
PING_OPT_TTL
The value written into the time-to-live (= TTL) field of generated ICMP packets. The memory pointed
to by val is interpreted as an integer. Valid values are 1 through 255. Default is PING_DEF_TTL.
PING_OPT_AF
The address family to use. The memory pointed to by val is interpreted as an integer and must be
either AF_UNSPEC, AF_INET, or AF_INET6. This option only affects hosts that are being added after
this option has been set. Default is PING_DEF_AF. If you change this option, and a source address is
set (see PING_OPT_SOURCE) that setting will be reset.
PING_OPT_DATA
Set the data to send. The value passed must be a char-pointer to a null-terminated string. By default
a 56 byte long string is used so that the packet size of an ICMPv4 packet is exactly 64 bytes. That's
the behavior of the ping(1) command.
PING_OPT_SOURCE
Set the source address to use. The value passed must be a char-pointer to a null-terminated string
specifying either a numerical network address or network hostname. This option will ignore the
address family setting (as set with PING_OPT_AF) and will set the object's address family according
to the source address assigned.
PING_OPT_DEVICE
Set the outgoing network device to be used. The value passed must be a char-pointer to a null-
terminated string specifying an interface name (e. g. "eth0"). Please note that this might not be
supported by all operating systems. In that case, ping_setopt sets the error to "operation not
supported".
PING_OPT_QOS
Sets the Quality of Service flags that should be used when crafting ICMP and ICMPv6 packets. The
memory pointed to by val is interpreted as a "uint8_t". The byte is passed to setsockopt(2) without
modification, using the "IP_TOS" (IPv4) or "IPV6_TCLASS" (IPv6) option. It is the caller's
responsibility to chose a valid bit combination. For details, read the ip(7) and ipv6(7) manual
pages, as well as RFC 2474.
PING_OPT_MARK
Mark (as in netfilter) outgoing packets using the SO_MARK socket option. Takes an int* pointer as a
value. Setting this requires CAP_NET_ADMIN under Linux. Fails with "operation not supported" on
platforms which don't have SO_MARK.
The val argument is a pointer to the new value. It must not be NULL. It is dereferenced depending on the
value of the opt argument, see above. The memory pointed to by val is not changed.
RETURN VALUE
ping_setopt returns zero upon success or less than zero upon failure.
SEE ALSO
ping_construct(3), liboping(3)
AUTHOR
liboping is written by Florian "octo" Forster <ff at octo.it>. Its homepage can be found at
<http://noping.cc/>.
Copyright (c) 2006-2017 by Florian "octo" Forster.