arch/um/kernel/tempfile.c

   1 /*
   2  * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <unistd.h>
   9 #include <string.h>
  10 #include <errno.h>
  11 #include <sys/param.h>
  12 #include "init.h"
  13
  14 /* Modified from create_mem_file and start_debugger */
  15 static char *tempdir = NULL;
  16
  17 static void __init find_tempdir(void)
  18 {
  19         char *dirs[] = { "TMP", "TEMP", "TMPDIR", NULL };
  20         int i;
  21         char *dir = NULL;
  22
  23         if(tempdir != NULL) return;     /* We've already been called */
  24         for(i = 0; dirs[i]; i++){
  25                 dir = getenv(dirs[i]);
  26                 if((dir != NULL) && (*dir != '\0'))
  27                         break;
  28         }
  29         if((dir == NULL) || (*dir == '\0'))
  30                 dir = "/tmp";
  31
  32         tempdir = malloc(strlen(dir) + 2);
  33         if(tempdir == NULL){
  34                 fprintf(stderr, "Failed to malloc tempdir, "
  35                         "errno = %d\n", errno);
  36                 return;
  37         }
  38         strcpy(tempdir, dir);
  39         strcat(tempdir, "/");
  40 }
  41
  42 int make_tempfile(const char *template, char **out_tempname, int do_unlink)
  43 {
  44         char tempname[MAXPATHLEN];
  45         int fd;
  46
  47         find_tempdir();
  48         if (*template != '/')
  49                 strcpy(tempname, tempdir);
  50         else
  51                 *tempname = 0;
  52         strcat(tempname, template);
  53         fd = mkstemp(tempname);
  54         if(fd < 0){
  55                 fprintf(stderr, "open - cannot create %s: %s\n", tempname,
  56                         strerror(errno));
  57                 return -1;
  58         }
  59         if(do_unlink && (unlink(tempname) < 0)){
  60                 perror("unlink");
  61                 return -1;
  62         }
  63         if(out_tempname){
  64                 *out_tempname = strdup(tempname);
  65                 if(*out_tempname == NULL){
  66                         perror("strdup");
  67                         return -1;
  68                 }
  69         }
  70         return(fd);
  71 }
  72
  73 /*
  74  * Overrides for Emacs so that we follow Linus's tabbing style.
  75  * Emacs will notice this stuff at the end of the file and automatically
  76  * adjust the settings for this buffer only.  This must remain at the end
  77  * of the file.
  78  * ---------------------------------------------------------------------------
  79  * Local variables:
  80  * c-file-style: "linux"
  81  * End:
  82  */