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