Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 279 insertions, 0 deletions

diff --git a/arch/um/os-Linux/mem.c b/arch/um/os-Linux/mem.c
new file mode 100644
index 00000000..8e421e1d
--- /dev/null
+++ b/arch/um/os-Linux/mem.c
@@ -0,0 +1,279 @@
+/*
+ * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <sys/param.h>
+#include "init.h"
+#include "os.h"
+
+/* Modified by which_tmpdir, which is called during early boot */
+static char *default_tmpdir = "/tmp";
+
+/*
+ *  Modified when creating the physical memory file and when checking
+ * the tmp filesystem for usability, both happening during early boot.
+ */
+static char *tempdir = NULL;
+
+static void __init find_tempdir(void)
+{
+	const char *dirs[] = { "TMP", "TEMP", "TMPDIR", NULL };
+	int i;
+	char *dir = NULL;
+
+	if (tempdir != NULL)
+		/* We've already been called */
+		return;
+	for (i = 0; dirs[i]; i++) {
+		dir = getenv(dirs[i]);
+		if ((dir != NULL) && (*dir != '\0'))
+			break;
+	}
+	if ((dir == NULL) || (*dir == '\0'))
+		dir = default_tmpdir;
+
+	tempdir = malloc(strlen(dir) + 2);
+	if (tempdir == NULL) {
+		fprintf(stderr, "Failed to malloc tempdir, "
+			"errno = %d\n", errno);
+		return;
+	}
+	strcpy(tempdir, dir);
+	strcat(tempdir, "/");
+}
+
+/*
+ * This will return 1, with the first character in buf being the
+ * character following the next instance of c in the file.  This will
+ * read the file as needed.  If there's an error, -errno is returned;
+ * if the end of the file is reached, 0 is returned.
+ */
+static int next(int fd, char *buf, size_t size, char c)
+{
+	ssize_t n;
+	size_t len;
+	char *ptr;
+
+	while ((ptr = strchr(buf, c)) == NULL) {
+		n = read(fd, buf, size - 1);
+		if (n == 0)
+			return 0;
+		else if (n < 0)
+			return -errno;
+
+		buf[n] = '\0';
+	}
+
+	ptr++;
+	len = strlen(ptr);
+	memmove(buf, ptr, len + 1);
+
+	/*
+	 * Refill the buffer so that if there's a partial string that we care
+	 * about, it will be completed, and we can recognize it.
+	 */
+	n = read(fd, &buf[len], size - len - 1);
+	if (n < 0)
+		return -errno;
+
+	buf[len + n] = '\0';
+	return 1;
+}
+
+/* which_tmpdir is called only during early boot */
+static int checked_tmpdir = 0;
+
+/*
+ * Look for a tmpfs mounted at /dev/shm.  I couldn't find a cleaner
+ * way to do this than to parse /proc/mounts.  statfs will return the
+ * same filesystem magic number and fs id for both /dev and /dev/shm
+ * when they are both tmpfs, so you can't tell if they are different
+ * filesystems.  Also, there seems to be no other way of finding the
+ * mount point of a filesystem from within it.
+ *
+ * If a /dev/shm tmpfs entry is found, then we switch to using it.
+ * Otherwise, we stay with the default /tmp.
+ */
+static void which_tmpdir(void)
+{
+	int fd, found;
+	char buf[128] = { '\0' };
+
+	if (checked_tmpdir)
+		return;
+
+	checked_tmpdir = 1;
+
+	printf("Checking for tmpfs mount on /dev/shm...");
+
+	fd = open("/proc/mounts", O_RDONLY);
+	if (fd < 0) {
+		printf("failed to open /proc/mounts, errno = %d\n", errno);
+		return;
+	}
+
+	while (1) {
+		found = next(fd, buf, ARRAY_SIZE(buf), ' ');
+		if (found != 1)
+			break;
+
+		if (!strncmp(buf, "/dev/shm", strlen("/dev/shm")))
+			goto found;
+
+		found = next(fd, buf, ARRAY_SIZE(buf), '\n');
+		if (found != 1)
+			break;
+	}
+
+err:
+	if (found == 0)
+		printf("nothing mounted on /dev/shm\n");
+	else if (found < 0)
+		printf("read returned errno %d\n", -found);
+
+out:
+	close(fd);
+
+	return;
+
+found:
+	found = next(fd, buf, ARRAY_SIZE(buf), ' ');
+	if (found != 1)
+		goto err;
+
+	if (strncmp(buf, "tmpfs", strlen("tmpfs"))) {
+		printf("not tmpfs\n");
+		goto out;
+	}
+
+	printf("OK\n");
+	default_tmpdir = "/dev/shm";
+	goto out;
+}
+
+static int __init make_tempfile(const char *template, char **out_tempname,
+				int do_unlink)
+{
+	char *tempname;
+	int fd;
+
+	which_tmpdir();
+	tempname = malloc(MAXPATHLEN);
+	if (tempname == NULL)
+		return -1;
+
+	find_tempdir();
+	if ((tempdir == NULL) || (strlen(tempdir) >= MAXPATHLEN))
+		goto out;
+
+	if (template[0] != '/')
+		strcpy(tempname, tempdir);
+	else
+		tempname[0] = '\0';
+	strncat(tempname, template, MAXPATHLEN-1-strlen(tempname));
+	fd = mkstemp(tempname);
+	if (fd < 0) {
+		fprintf(stderr, "open - cannot create %s: %s\n", tempname,
+			strerror(errno));
+		goto out;
+	}
+	if (do_unlink && (unlink(tempname) < 0)) {
+		perror("unlink");
+		goto close;
+	}
+	if (out_tempname) {
+		*out_tempname = tempname;
+	} else
+		free(tempname);
+	return fd;
+close:
+	close(fd);
+out:
+	free(tempname);
+	return -1;
+}
+
+#define TEMPNAME_TEMPLATE "vm_file-XXXXXX"
+
+static int __init create_tmp_file(unsigned long long len)
+{
+	int fd, err;
+	char zero;
+
+	fd = make_tempfile(TEMPNAME_TEMPLATE, NULL, 1);
+	if (fd < 0)
+		exit(1);
+
+	err = fchmod(fd, 0777);
+	if (err < 0) {
+		perror("fchmod");
+		exit(1);
+	}
+
+	/*
+	 * Seek to len - 1 because writing a character there will
+	 * increase the file size by one byte, to the desired length.
+	 */
+	if (lseek64(fd, len - 1, SEEK_SET) < 0) {
+		perror("lseek64");
+		exit(1);
+	}
+
+	zero = 0;
+
+	err = write(fd, &zero, 1);
+	if (err != 1) {
+		perror("write");
+		exit(1);
+	}
+
+	return fd;
+}
+
+int __init create_mem_file(unsigned long long len)
+{
+	int err, fd;
+
+	fd = create_tmp_file(len);
+
+	err = os_set_exec_close(fd);
+	if (err < 0) {
+		errno = -err;
+		perror("exec_close");
+	}
+	return fd;
+}
+
+
+void __init check_tmpexec(void)
+{
+	void *addr;
+	int err, fd = create_tmp_file(UM_KERN_PAGE_SIZE);
+
+	addr = mmap(NULL, UM_KERN_PAGE_SIZE,
+		    PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE, fd, 0);
+	printf("Checking PROT_EXEC mmap in %s...",tempdir);
+	fflush(stdout);
+	if (addr == MAP_FAILED) {
+		err = errno;
+		perror("failed");
+		close(fd);
+		if (err == EPERM)
+			printf("%s must be not mounted noexec\n",tempdir);
+		exit(1);
+	}
+	printf("OK\n");
+	munmap(addr, UM_KERN_PAGE_SIZE);
+
+	close(fd);
+}