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Windows: Work around an oddity when a pipe with no reader is written to.

On Windows, write() is implemented using WriteFile(). After the reader
closed its end of the pipe, the first WriteFile() returns
ERROR_BROKEN_PIPE (which translates to EPIPE), subsequent WriteFile()s
return ERROR_NO_DATA, which is translated to EINVAL.

Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at>
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1 parent bfdd9ff commit b2f5e2684da060dd821bf90f88df8b6dc9401a40 Johannes Sixt committed Aug 17, 2007
Showing with 6 additions and 1 deletion.
  1. +6 −1 write_or_die.c
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@@ -34,7 +34,12 @@ void maybe_flush_or_die(FILE *f, const char *desc)
return;
}
if (fflush(f)) {
- if (errno == EPIPE)
+ /*
+ * On Windows, EPIPE is returned only by the first write()
+ * after the reading end has closed its handle; subsequent
+ * write()s return EINVAL.
+ */
+ if (errno == EPIPE || errno == EINVAL)
exit(0);
die("write failure on %s: %s", desc, strerror(errno));
}

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