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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;
}
}
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