if.h(7posix) [posix man page]
<net/if.h>(P) POSIX Programmer's Manual <net/if.h>(P) NAME
net/if.h - sockets local interfaces SYNOPSIS
#include <net/if.h> DESCRIPTION
The <net/if.h> header shall define the if_nameindex structure that includes at least the following members: unsigned if_index Numeric index of the interface. char *if_name Null-terminated name of the interface. The <net/if.h> header shall define the following macro for the length of a buffer containing an interface name (including the terminating NULL character): IF_NAMESIZE Interface name length. The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided. unsigned if_nametoindex(const char *); char *if_indextoname(unsigned, char *); struct if_nameindex *if_nameindex(void); void if_freenameindex(struct if_nameindex *); The following sections are informative. APPLICATION USAGE
None. RATIONALE
None. FUTURE DIRECTIONS
None. SEE ALSO
The System Interfaces volume of IEEE Std 1003.1-2001, if_freenameindex(), if_indextoname(), if_nameindex(), if_nametoindex() COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html . IEEE
/The Open Group 2003 <net/if.h>(P)
Check Out this Related Man Page
IF_INDEXTONAME(3P) POSIX Programmer's Manual IF_INDEXTONAME(3P) PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the correspond- ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux. NAME
if_indextoname - map a network interface index to its corresponding name SYNOPSIS
#include <net/if.h> char *if_indextoname(unsigned ifindex, char *ifname); DESCRIPTION
The if_indextoname() function shall map an interface index to its corresponding name. When this function is called, ifname shall point to a buffer of at least {IF_NAMESIZE} bytes. The function shall place in this buffer the name of the interface with index ifindex. RETURN VALUE
If ifindex is an interface index, then the function shall return the value supplied in ifname, which points to a buffer now containing the interface name. Otherwise, the function shall return a NULL pointer and set errno to indicate the error. ERRORS
The if_indextoname() function shall fail if: ENXIO The interface does not exist. The following sections are informative. EXAMPLES
None. APPLICATION USAGE
None. RATIONALE
None. FUTURE DIRECTIONS
None. SEE ALSO
getsockopt(), if_freenameindex(), if_nameindex(), if_nametoindex(), setsockopt(), the Base Definitions volume of IEEE Std 1003.1-2001, <net/if.h> COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html . IEEE
/The Open Group 2003 IF_INDEXTONAME(3P)