ref: e4509d40cc9759baddf1c2571247b95d2f5b61a5
dir: /sys/src/libstdio/tmpfile.c/
/* * 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]); }