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/**
* @file large_fd_set.c
*
* @brief Macro's and functions for manipulation of large file descriptor sets.
*/
#include <net-snmp/net-snmp-config.h>
#include <stdio.h>
#include <string.h> /* memset(), which is invoked by FD_ZERO() */
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/library/snmp_assert.h>
#include <net-snmp/library/large_fd_set.h>
#if !defined(cygwin) && defined(HAVE_WINSOCK_H)
void
netsnmp_large_fd_setfd(SOCKET fd, netsnmp_large_fd_set * fdset)
{
unsigned i;
netsnmp_assert(fd != INVALID_SOCKET);
if (fdset->lfs_set.fd_count == fdset->lfs_setsize)
netsnmp_large_fd_set_resize(fdset, 2 * (fdset->lfs_setsize + 1));
for (i = 0; i < fdset->lfs_set.fd_count; i++) {
if (fdset->lfs_set.fd_array[i] == (SOCKET) (fd))
break;
}
if (i == fdset->lfs_set.fd_count
&& fdset->lfs_set.fd_count < fdset->lfs_setsize) {
fdset->lfs_set.fd_count++;
fdset->lfs_set.fd_array[i] = fd;
}
}
void
netsnmp_large_fd_clr(SOCKET fd, netsnmp_large_fd_set * fdset)
{
unsigned i;
netsnmp_assert(fd != INVALID_SOCKET);
for (i = 0; i < fdset->lfs_set.fd_count; i++) {
if (fdset->lfs_set.fd_array[i] == fd) {
while (i < fdset->lfs_set.fd_count - 1) {
fdset->lfs_set.fd_array[i] =
fdset->lfs_set.fd_array[i + 1];
i++;
}
fdset->lfs_set.fd_count--;
break;
}
}
}
int
netsnmp_large_fd_is_set(SOCKET fd, netsnmp_large_fd_set * fdset)
{
unsigned int i;
netsnmp_assert(fd != INVALID_SOCKET);
for (i = 0; i < fdset->lfs_set.fd_count; i++) {
if (fdset->lfs_set.fd_array[i] == fd)
return 1;
}
return 0;
}
#else
void
netsnmp_large_fd_setfd(int fd, netsnmp_large_fd_set * fdset)
{
netsnmp_assert(fd >= 0);
while (fd >= (int)fdset->lfs_setsize)
netsnmp_large_fd_set_resize(fdset, 2 * (fdset->lfs_setsize + 1));
FD_SET(fd, fdset->lfs_setptr);
}
void
netsnmp_large_fd_clr(int fd, netsnmp_large_fd_set * fdset)
{
netsnmp_assert(fd >= 0);
if ((unsigned)fd < fdset->lfs_setsize)
FD_CLR(fd, fdset->lfs_setptr);
}
int
netsnmp_large_fd_is_set(int fd, netsnmp_large_fd_set * fdset)
{
netsnmp_assert(fd >= 0);
return (unsigned)fd < fdset->lfs_setsize && FD_ISSET(fd, fdset->lfs_setptr);
}
#endif
void
netsnmp_large_fd_set_init(netsnmp_large_fd_set * fdset, int setsize)
{
fdset->lfs_setsize = 0;
fdset->lfs_setptr = NULL;
#if !defined(cygwin) && defined(HAVE_WINSOCK_H)
fdset->lfs_set.fd_count = 0;
#endif
netsnmp_large_fd_set_resize(fdset, setsize);
}
int
netsnmp_large_fd_set_select(int numfds, netsnmp_large_fd_set *readfds,
netsnmp_large_fd_set *writefds,
netsnmp_large_fd_set *exceptfds,
struct timeval *timeout)
{
#if defined(cygwin) || !defined(HAVE_WINSOCK_H)
/* Bit-set representation: make sure all fds have at least size 'numfds'. */
if (readfds && readfds->lfs_setsize < numfds)
netsnmp_large_fd_set_resize(readfds, numfds);
if (writefds && writefds->lfs_setsize < numfds)
netsnmp_large_fd_set_resize(writefds, numfds);
if (exceptfds && exceptfds->lfs_setsize < numfds)
netsnmp_large_fd_set_resize(exceptfds, numfds);
#else
/* Array representation: no resizing is necessary. */
#endif
return select(numfds,
readfds ? readfds->lfs_setptr : NULL,
writefds ? writefds->lfs_setptr : NULL,
exceptfds ? exceptfds->lfs_setptr : NULL,
timeout);
}
int
netsnmp_large_fd_set_resize(netsnmp_large_fd_set * fdset, int setsize)
{
int fd_set_bytes;
if (fdset->lfs_setsize == setsize)
goto success;
if (setsize > FD_SETSIZE) {
fd_set_bytes = NETSNMP_FD_SET_BYTES(setsize);
if (fdset->lfs_setsize > FD_SETSIZE) {
fdset->lfs_setptr = realloc(fdset->lfs_setptr, fd_set_bytes);
if (!fdset->lfs_setptr)
goto out_of_mem;
} else {
fdset->lfs_setptr = malloc(fd_set_bytes);
if (!fdset->lfs_setptr)
goto out_of_mem;
*fdset->lfs_setptr = fdset->lfs_set;
}
} else {
if (fdset->lfs_setsize > FD_SETSIZE) {
fdset->lfs_set = *fdset->lfs_setptr;
free(fdset->lfs_setptr);
}
fdset->lfs_setptr = &fdset->lfs_set;
}
#if defined(cygwin) || !defined(HAVE_WINSOCK_H)
{
int i;
/*
* Unix: when enlarging, clear the file descriptors defined in the
* resized *fdset but that were not defined in the original *fdset.
*/
for (i = fdset->lfs_setsize; i < setsize; i++)
FD_CLR(i, fdset->lfs_setptr);
}
#endif
fdset->lfs_setsize = setsize;
#if !defined(cygwin) && defined(HAVE_WINSOCK_H)
if (setsize < fdset->lfs_set.fd_count)
fdset->lfs_set.fd_count = setsize;
#endif
success:
return 1;
out_of_mem:
fdset->lfs_setsize = 0;
#if !defined(cygwin) && defined(HAVE_WINSOCK_H)
fdset->lfs_set.fd_count = 0;
#endif
return 0;
}
void
netsnmp_large_fd_set_cleanup(netsnmp_large_fd_set * fdset)
{
netsnmp_large_fd_set_resize(fdset, 0);
fdset->lfs_setsize = 0;
fdset->lfs_setptr = NULL;
}
void
netsnmp_copy_fd_set_to_large_fd_set(netsnmp_large_fd_set * dst,
const fd_set * src)
{
netsnmp_large_fd_set_resize(dst, FD_SETSIZE);
*dst->lfs_setptr = *src;
}
int
netsnmp_copy_large_fd_set_to_fd_set(fd_set * dst,
const netsnmp_large_fd_set * src)
{
/* Report failure if *src is larger than FD_SETSIZE. */
if (src->lfs_setsize > FD_SETSIZE) {
FD_ZERO(dst);
return -1;
}
*dst = *src->lfs_setptr;
#if !(!defined(cygwin) && defined(HAVE_WINSOCK_H))
{
int i;
/* Unix: clear any file descriptors defined in *dst but not in *src. */
for (i = src->lfs_setsize; i < FD_SETSIZE; ++i)
FD_CLR(i, dst);
}
#endif
return 0;
}
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