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/* $NetBSD: read_child.c,v 1.3 2011/09/24 12:58:55 joerg Exp $ */
/*-
* Copyright (c) 2007 Joerg Sonnenberger <joerg@NetBSD.org>.
* All rights reserved.
*
* This code was developed as part of Google's Summer of Code 2007 program.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <nbcompat.h>
#include <sys/wait.h>
#include <nbcompat/err.h>
#include <signal.h>
#include <nbcompat/stdlib.h>
#include <nbcompat/string.h>
#include "pbulk.h"
char *
read_from_child(const char *dir, const char *cmd, const char * const *argv)
{
char *buf;
size_t buf_len, cur_len;
ssize_t bytes_read;
int fd, status;
pid_t child;
if ((child = fork_chdir_exec(dir, cmd, argv, &fd)) == -1)
return NULL;
cur_len = 0;
buf_len = 4096;
buf = xmalloc(buf_len + 1);
while ((bytes_read = read(fd, buf + cur_len, buf_len - cur_len)) > 0) {
cur_len += bytes_read;
if (cur_len * 2 < buf_len)
continue;
buf_len *= 2;
buf = xrealloc(buf, buf_len + 1);
}
if (bytes_read == -1) {
(void)close(fd);
(void)kill(child, SIGTERM);
(void)waitpid(child, &status, 0);
err(1, "read failed");
}
(void)close(fd);
(void)waitpid(child, &status, 0);
if (status != 0 || memchr(buf, 0, cur_len) != NULL) {
free(buf);
return NULL;
}
buf[cur_len] = '\0';
return buf;
}
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