[PATCH] uml: move libc code out of mem_user.c and tempfile.c

The serial UML OS-abstraction layer patch (um/kernel dir).

This moves all system calls from mem_user.c and tempfile.c files under
os-Linux dir.

Signed-off-by: Gennady Sharapov <Gennady.V.Sharapov@intel.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/um/os-Linux/mem.c

@@ -0,0 +1,161 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/mman.h>
+#include "kern_util.h"
+#include "user.h"
+#include "user_util.h"
+#include "mem_user.h"
+#include "init.h"
+#include "os.h"
+#include "tempfile.h"
+#include "kern_constants.h"
+
+#include <sys/param.h>
+
+static char *tempdir = NULL;
+
+static void __init find_tempdir(void)
+{
+	char *dirs[] = { "TMP", "TEMP", "TMPDIR", NULL };
+	int i;
+	char *dir = NULL;
+
+	if(tempdir != NULL) return;	/* We've already been called */
+	for(i = 0; dirs[i]; i++){
+		dir = getenv(dirs[i]);
+		if((dir != NULL) && (*dir != '\0'))
+			break;
+	}
+	if((dir == NULL) || (*dir == '\0'))
+		dir = "/tmp";
+
+	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 proc still used in tt-mode
+ * (file: kernel/tt/ptproxy/proxy.c, proc: start_debugger).
+ * So it isn't 'static' yet.
+ */
+int make_tempfile(const char *template, char **out_tempname, int do_unlink)
+{
+	char tempname[MAXPATHLEN];
+	int fd;
+
+	find_tempdir();
+	if (*template != '/')
+		strcpy(tempname, tempdir);
+	else
+		*tempname = 0;
+	strcat(tempname, template);
+	fd = mkstemp(tempname);
+	if(fd < 0){
+		fprintf(stderr, "open - cannot create %s: %s\n", tempname,
+			strerror(errno));
+		return -1;
+	}
+	if(do_unlink && (unlink(tempname) < 0)){
+		perror("unlink");
+		return -1;
+	}
+	if(out_tempname){
+		*out_tempname = strdup(tempname);
+		if(*out_tempname == NULL){
+			perror("strdup");
+			return -1;
+		}
+	}
+	return(fd);
+}
+
+#define TEMPNAME_TEMPLATE "vm_file-XXXXXX"
+
+/*
+ * This proc is used in start_up.c
+ * So it isn't 'static'.
+ */
+int create_tmp_file(unsigned 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("os_mode_fd");
+		exit(1);
+	}
+
+        if (lseek64(fd, len, SEEK_SET) < 0) {
+ 		perror("os_seek_file");
+		exit(1);
+	}
+
+	zero = 0;
+
+	err = os_write_file(fd, &zero, 1);
+	if(err != 1){
+		errno = -err;
+		perror("os_write_file");
+		exit(1);
+	}
+
+	return(fd);
+}
+
+static int create_anon_file(unsigned long len)
+{
+	void *addr;
+	int fd;
+
+	fd = open("/dev/anon", O_RDWR);
+	if(fd < 0) {
+		perror("opening /dev/anon");
+		exit(1);
+	}
+
+	addr = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
+	if(addr == MAP_FAILED){
+		perror("mapping physmem file");
+		exit(1);
+	}
+	munmap(addr, len);
+
+	return(fd);
+}
+
+extern int have_devanon;
+
+int create_mem_file(unsigned long len)
+{
+	int err, fd;
+
+	if(have_devanon)
+		fd = create_anon_file(len);
+	else fd = create_tmp_file(len);
+
+	err = os_set_exec_close(fd, 1);
+	if(err < 0){
+		errno = -err;
+		perror("exec_close");
+	}
+	return(fd);
+}