87276f721a
Switch this proc from storing 4k of data (a whole path) on the stack to keeping it on the heap. Maybe it's not called in process context but only in early boot context (where in UML you have a normal process stack on the host) but just to be safe, fix it. While at it some little readability simplifications. Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Cc: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
139 lines
2.4 KiB
C
139 lines
2.4 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <stdarg.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/mman.h>
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#include "kern_util.h"
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#include "user.h"
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#include "user_util.h"
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#include "mem_user.h"
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#include "init.h"
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#include "os.h"
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#include "tempfile.h"
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#include "kern_constants.h"
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#include <sys/param.h>
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static char *tempdir = NULL;
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static void __init find_tempdir(void)
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{
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char *dirs[] = { "TMP", "TEMP", "TMPDIR", NULL };
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int i;
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char *dir = NULL;
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if(tempdir != NULL) return; /* We've already been called */
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for(i = 0; dirs[i]; i++){
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dir = getenv(dirs[i]);
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if((dir != NULL) && (*dir != '\0'))
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break;
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}
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if((dir == NULL) || (*dir == '\0'))
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dir = "/tmp";
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tempdir = malloc(strlen(dir) + 2);
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if(tempdir == NULL){
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fprintf(stderr, "Failed to malloc tempdir, "
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"errno = %d\n", errno);
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return;
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}
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strcpy(tempdir, dir);
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strcat(tempdir, "/");
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}
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/*
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* This proc still used in tt-mode
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* (file: kernel/tt/ptproxy/proxy.c, proc: start_debugger).
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* So it isn't 'static' yet.
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*/
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int make_tempfile(const char *template, char **out_tempname, int do_unlink)
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{
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char *tempname;
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int fd;
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tempname = malloc(MAXPATHLEN);
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find_tempdir();
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if (template[0] != '/')
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strcpy(tempname, tempdir);
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else
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tempname[0] = '\0';
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strcat(tempname, template);
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fd = mkstemp(tempname);
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if(fd < 0){
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fprintf(stderr, "open - cannot create %s: %s\n", tempname,
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strerror(errno));
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goto out;
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}
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if(do_unlink && (unlink(tempname) < 0)){
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perror("unlink");
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goto out;
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}
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if(out_tempname){
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*out_tempname = tempname;
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} else {
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free(tempname);
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}
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return(fd);
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out:
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free(tempname);
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return -1;
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}
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#define TEMPNAME_TEMPLATE "vm_file-XXXXXX"
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/*
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* This proc is used in start_up.c
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* So it isn't 'static'.
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*/
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int create_tmp_file(unsigned long long len)
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{
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int fd, err;
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char zero;
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fd = make_tempfile(TEMPNAME_TEMPLATE, NULL, 1);
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if(fd < 0) {
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exit(1);
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}
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err = fchmod(fd, 0777);
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if(err < 0){
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perror("os_mode_fd");
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exit(1);
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}
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if (lseek64(fd, len, SEEK_SET) < 0) {
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perror("os_seek_file");
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exit(1);
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}
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zero = 0;
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err = os_write_file(fd, &zero, 1);
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if(err != 1){
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errno = -err;
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perror("os_write_file");
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exit(1);
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}
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return(fd);
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}
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int create_mem_file(unsigned long long len)
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{
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int err, fd;
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fd = create_tmp_file(len);
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err = os_set_exec_close(fd, 1);
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if(err < 0){
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errno = -err;
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perror("exec_close");
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}
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return(fd);
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}
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