mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-27 09:36:57 +07:00
0f80bc85c5
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>
162 lines
2.8 KiB
C
162 lines
2.8 KiB
C
#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);
|
|
}
|