123456789101112131415161718192021222324252627282930313233343536373839404142434445464748 |
- /*
- * pANS stdio -- tmpfile
- *
- * Bug: contains a critical section. Two executions by the same
- * user could interleave as follows, both yielding the same file:
- * access fails
- * access fails
- * fopen succeeds
- * fopen succeeds
- * unlink succeeds
- * unlink fails
- * As I read the pANS, this can't reasonably use tmpnam to generate
- * the name, so that code is duplicated.
- */
- #include "iolib.h"
- static char tmpsmade[FOPEN_MAX][L_tmpnam+1];
- static int ntmps = 0;
- static void rmtmps(void);
- FILE *tmpfile(void){
- FILE *f;
- static char name[]="/tmp/tf0000000000000";
- char *p;
- while(access(name, 0)==0){
- p=name+7;
- while(*p=='9') *p++='0';
- if(*p=='\0') return NULL;
- ++*p;
- }
- f=fopen(name, "wb+");
- if(f && ntmps<FOPEN_MAX){
- if(ntmps==0)
- atexit(rmtmps);
- strcpy(tmpsmade[ntmps++], name);
- }
- return f;
- }
- static void
- rmtmps(void)
- {
- int i;
-
- for(i=0; i<ntmps; i++)
- remove(tmpsmade[i]);
- }
|