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-rw-r--r--lib/sh/zwrite.c64
1 files changed, 64 insertions, 0 deletions
diff --git a/lib/sh/zwrite.c b/lib/sh/zwrite.c
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--- /dev/null
+++ b/lib/sh/zwrite.c
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+/* zwrite - write contents of buffer to file descriptor, retrying on error */
+
+/* Copyright (C) 1999-2002 Free Software Foundation, Inc.
+
+ This file is part of GNU Bash, the Bourne Again SHell.
+
+ Bash is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Bash is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with Bash. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <config.h>
+
+#include <sys/types.h>
+
+#if defined (HAVE_UNISTD_H)
+# include <unistd.h>
+#endif
+
+#include <errno.h>
+
+#if !defined (errno)
+extern int errno;
+#endif
+
+/* Write NB bytes from BUF to file descriptor FD, retrying the write if
+ it is interrupted. We retry three times if we get a zero-length
+ write. Any other signal causes this function to return prematurely. */
+int
+zwrite (fd, buf, nb)
+ int fd;
+ char *buf;
+ size_t nb;
+{
+ int n, i, nt;
+
+ for (n = nb, nt = 0;;)
+ {
+ i = write (fd, buf, n);
+ if (i > 0)
+ {
+ n -= i;
+ if (n <= 0)
+ return nb;
+ buf += i;
+ }
+ else if (i == 0)
+ {
+ if (++nt > 3)
+ return (nb - n);
+ }
+ else if (errno != EINTR)
+ return -1;
+ }
+}