pkgsrc pkg_install tools, ported by Gautam Tirumala.

commands/pkg_install/lib/fexec.c

@@ -0,0 +1,171 @@
+/*	$NetBSD: fexec.c,v 1.12 2009/08/02 17:56:45 joerg Exp $	*/
+
+/*-
+ * Copyright (c) 2003 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Matthias Scheler.
+ *
+ * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+#ifndef __minix
+#include <nbcompat.h>
+#endif
+#if HAVE_SYS_CDEFS_H
+#include <sys/cdefs.h>
+#endif
+#if HAVE_SYS_WAIT_H
+#include <sys/wait.h>
+#endif
+
+#if HAVE_ERR_H
+#include <err.h>
+#endif
+#if HAVE_ERRNO_H
+#include <errno.h>
+#endif
+#if HAVE_STDARG_H
+#include <stdarg.h>
+#endif
+#if HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#include "lib.h"
+
+#ifndef __minix
+__RCSID("$NetBSD: fexec.c,v 1.12 2009/08/02 17:56:45 joerg Exp $");
+#endif
+
+static int	vfcexec(const char *, int, const char *, va_list);
+
+/*
+ * fork, then change current working directory to path and
+ * execute the command and arguments in the argv array.
+ * wait for the command to finish, then return the exit status.
+ */
+int
+pfcexec(const char *path, const char *file, const char **argv)
+{
+	pid_t			child;
+	int			status;
+
+	child = vfork();
+	switch (child) {
+	case 0:
+		if ((path != NULL) && (chdir(path) < 0))
+			_exit(127);
+
+		(void)execvp(file, __UNCONST(argv));
+		_exit(127);
+		/* NOTREACHED */
+	case -1:
+		return -1;
+	}
+
+	while (waitpid(child, &status, 0) < 0) {
+		if (errno != EINTR)
+			return -1;
+	}
+
+	if (!WIFEXITED(status))
+		return -1;
+
+	return WEXITSTATUS(status);
+}
+
+static int
+vfcexec(const char *path, int skipempty, const char *arg, va_list ap)
+{
+	const char **argv;
+	size_t argv_size, argc;
+	int retval;
+
+	argv_size = 16;
+	argv = xcalloc(argv_size, sizeof(*argv));
+
+	argv[0] = arg;
+	argc = 1;
+
+	do {
+		if (argc == argv_size) {
+			argv_size *= 2;
+			argv = xrealloc(argv, argv_size * sizeof(*argv));
+		}
+		arg = va_arg(ap, const char *);
+		if (skipempty && arg && strlen(arg) == 0)
+		    continue;
+		argv[argc++] = arg;
+	} while (arg != NULL);
+
+	retval = pfcexec(path, argv[0], argv);
+	free(argv);
+	return retval;
+}
+
+int
+fexec(const char *arg, ...)
+{
+	va_list	ap;
+	int	result;
+
+	va_start(ap, arg);
+	result = vfcexec(NULL, 0, arg, ap);
+	va_end(ap);
+
+	return result;
+}
+
+int
+fexec_skipempty(const char *arg, ...)
+{
+	va_list	ap;
+	int	result;
+
+	va_start(ap, arg);
+	result = vfcexec(NULL, 1, arg, ap);
+	va_end(ap);
+
+	return result;
+}
+
+int
+fcexec(const char *path, const char *arg, ...)
+{
+	va_list	ap;
+	int	result;
+
+	va_start(ap, arg);
+	result = vfcexec(path, 0, arg, ap);
+	va_end(ap);
+
+	return result;
+}