441ede378e
try to use writev(2) in a non-blocking mode, especially on sockets. Not only this makes handling of EAGAIN rather weird, but in the case of sockets makes your code subject of a ENOBUFS, which is absolutely unclear how to handle properly. *sigh* Bump PORTREVISION.
57 lines
1.2 KiB
Text
57 lines
1.2 KiB
Text
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$FreeBSD$
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--- configure.in 2001/10/27 12:08:05 1.1
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+++ configure.in 2001/10/27 12:33:26
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@@ -241,33 +241,29 @@
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dnl This generates warnings from autoconf...
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AC_C_BIGENDIAN
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+AC_MSG_CHECKING(how many vectors writev is capable to handle)
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AC_TRY_RUN([
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-#include <fcntl.h>
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+#include <sys/types.h>
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#include <sys/uio.h>
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-#define NIOVECS 50
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-int main(int argc, char *argv[])
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+#include <fcntl.h>
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+#include <stdio.h>
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+int main()
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{
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- char dumbuf[20] = "\n";
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- struct iovec iovecs[NIOVECS];
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- int i,fd;
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-
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- for(i = 0; i < NIOVECS; i++) {
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- iovecs[i].iov_base = dumbuf;
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- iovecs[i].iov_len = 1;
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- }
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-
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- fd=open("/dev/null", O_WRONLY);
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- if(fd==-1)
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- return(1);
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-
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- if(writev(fd, iovecs, NIOVECS) < 0)
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- return 1;
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-
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+ FILE *f;
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+ int fd, i;
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+ static struct iovec iovecs[4097];
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+ if ((f = fopen("conftestval", "w")) == NULL || \
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+ (fd = open("/dev/null", O_WRONLY)) < 0)
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+ exit(1);
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+ for (i = 1; i < 4098 && writev(fd, iovecs, i) >= 0; i++);
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+ fprintf(f, "%d\n", i - 1);
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+ fclose(f);
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close(fd);
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- return 0;
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+ exit(0);
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}
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-], , AC_DEFINE(HAVE_LIMITED_WRITEV), AC_DEFINE(HAVE_LIMITED_WRITEV))
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-AC_SUBST(HAVE_LIMITED_WRITEV)
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+], MAXIOV=`cat conftestval`, MAXIOV=16, MAXIOV=16)dnl
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+AC_MSG_RESULT($MAXIOV)
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+AC_SUBST(MAXIOV)
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#######################
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# type alignment test #
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