84 lines
1.6 KiB
C
84 lines
1.6 KiB
C
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/*
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* Copyright 1993, University Corporation for Atmospheric Research
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* See ../COPYRIGHT file for copying and redistribution conditions.
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*/
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/* $Id: fdnb.c,v 1.5 2002/12/09 18:23:56 steve Exp $ */
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#include <ldmconfig.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include "ulog.h"
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#include "fdnb.h"
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/* some systems have FNDELAY (== O_NDELAY) different from O_NONBLOCK */
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#if defined(__ultrix) || defined(ultrix)
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/* ultrix 4.3 (and before?) */
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/* #define NB_O_NONBLOCK (FNDELAY | O_NONBLOCK) */
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#define NB_O_NONBLOCK FNDELAY
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#endif
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/* default do like posix sez */
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#ifndef NB_O_NONBLOCK
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#define NB_O_NONBLOCK O_NONBLOCK
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#endif
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/*
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* Set descriptor for non blocking
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* return 1 if changed, 0 otherwise.
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*/
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int
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set_fd_nonblock(int fd)
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{
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unsigned flags = (unsigned)fcntl(fd, F_GETFL, 0);
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if(flags == (unsigned)-1)
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{
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serror("fcntl(..., F_GETFL,)");
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return 0;
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}
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/* else */
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if(flags & NB_O_NONBLOCK)
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return 0; /* no change required */
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/* else */
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flags |= NB_O_NONBLOCK;
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if(fcntl(fd, F_SETFL, (int)flags) == -1)
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{
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serror("fcntl(..., F_SETFL, O_NONBLOCK)");
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return 0;
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}
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return 1;
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}
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/*
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* clear descriptor for non blocking
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* (EG, set to blocking)
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* return 1 if changed, 0 otherwise.
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*/
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int
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clr_fd_nonblock(int fd)
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{
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int flags = fcntl(fd, F_GETFL, 0);
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if(flags == -1)
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{
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serror("fcntl(..., F_GETFL,)");
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return 0;
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}
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/* else */
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if(!((unsigned int)flags & NB_O_NONBLOCK))
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return 0; /* no change required */
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/* else */
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flags &= ~NB_O_NONBLOCK;
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if(fcntl(fd, F_SETFL, flags) == -1)
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{
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serror("fcntl(..., F_SETFL, &= ~O_NONBLOCK)");
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return 0;
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}
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return 1;
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}
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