1 files changed, 161 insertions, 0 deletions

diff --git a/arch/um/os-Linux/mem.c b/arch/um/os-Linux/mem.c
new file mode 100644
index 000000000000..8e71edaaf80b
--- /dev/null
+++ b/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);
+}