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Diffstat (limited to 'src/graph/viewman/sselect.c')
-rw-r--r-- | src/graph/viewman/sselect.c | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/src/graph/viewman/sselect.c b/src/graph/viewman/sselect.c new file mode 100644 index 00000000..1cb584c5 --- /dev/null +++ b/src/graph/viewman/sselect.c @@ -0,0 +1,103 @@ +/* + Copyright (C) 1991-2002, The Numerical ALgorithms Group Ltd. + All rights reserved. + Copyright (C) 2007-2008, Gabriel Dos Reis. + All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + - Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + + - Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in + the documentation and/or other materials provided with the + distribution. + + - Neither the name of The Numerical ALgorithms Group Ltd. nor the + names of its contributors may be used to endorse or promote products + derived from this software without specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS + IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED + TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A + PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER + OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF + LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +*/ + +#define _SSELECT_C +#include "axiom-c-macros.h" + +#include <stdio.h> +#include <errno.h> +#include <sys/time.h> +#include <sys/wait.h> +#include <signal.h> + +#include "viewman.h" +#include "bsdsignal.h" + +#include "sockio.h" +#include "bsdsignal.H1" +#include "cleanup.H1" +#include "sselect.H1" + +/******************************************* + * int superSelect(n, rd, wr, ex, timeout) * + * * + * superselect! if select returns a -1 * + * due to an interrupt (EINTR), this * + * routine checks to see if it's a * + * child viewport that has closed. * + * Expected global variables: * + * int checkClosedChild * + *******************************************/ + +int +#ifdef _NO_PROTO +superSelect(n, rd, wr, ex, timeout) + int n; + int *rd, *wr, *ex; + char *timeout; +#else +superSelect(int n, int *rd, int *wr, int *ex, char *timeout) +#endif +{ + + int waiting; + viewManager *viewport; + int ret_val; + + ret_val = select(n, (void *)rd, (void *)wr, (void *)ex, (void *)timeout); + while (ret_val == -1 && errno == EINTR) { + /* checkClosedChild gets set by the SIGCHLD handler */ + if (checkClosedChild) { + while ((waiting = wait(0)) == -1 ); + viewport = viewports; + while ((viewport) && (viewport->PID != waiting)) + viewport = viewport->nextViewport; + if (viewport) { + /* we shouldn't really be doing this since child is dead */ + /* rmViewMgr(viewport); */ + /* flush(spadSock); */ + /* send_int(spadSock,1); acknowledge to spad */ + checkClosedChild = no; +#if defined(BSDplatform) || defined(MACOSXplatform) + bsdSignal(SIGCHLD,endChild,DontRestartSystemCalls); +#else + bsdSignal(SIGCLD,endChild,DontRestartSystemCalls); +#endif + } + } + ret_val = select(n, (void *)rd, (void *)wr, (void *)ex, (void *)timeout); + } + return ret_val; +} |