Blame SOURCES/gzip-1.5-nonblock.patch
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diff --git a/util.c b/util.c
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index 46bc89d..34fd789 100644
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--- a/util.c
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+++ b/util.c
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@@ -139,9 +139,29 @@ read_buffer (fd, buf, cnt)
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voidp buf;
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unsigned int cnt;
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{
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+ int len;
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+#ifdef INT_MAX
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if (INT_MAX < cnt)
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cnt = INT_MAX;
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- return read (fd, buf, cnt);
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+#endif
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+ len = read (fd, buf, cnt);
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+
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+#if defined F_SETFL && O_NONBLOCK && defined EAGAIN
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+ /* Iput files are opened O_NONBLOCK for security reasons. On some
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+ file systems this can cause read to fail with errno == EAGAIN. */
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+ if (len < 0 && errno == EAGAIN)
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+ {
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+ int flags = fcntl (fd, F_GETFL);
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+ if (0 <= flags)
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+ {
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+ if (! (flags & O_NONBLOCK))
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+ errno = EAGAIN;
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+ else if (fcntl (fd, F_SETFL, flags & ~O_NONBLOCK) != -1)
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+ len = read (fd, buf, cnt);
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+ }
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+ }
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+#endif
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+ return len;
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}
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/* Likewise for 'write'. */
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