usr/src/lib/libbc/libc/gen/common/mkstemp.c

   1 /*
   2  * Copyright (c) 1983 Regents of the University of California.
   3  * All rights reserved.  The Berkeley software License Agreement
   4  * specifies the terms and conditions for redistribution.
   5  */
   6
   7 #pragma ident   "%Z%%M% %I%     %E% SMI"
   8
   9 #include <sys/file.h>
  10
  11 int
  12 mkstemp(char *as)
  13 {
  14         char *s;
  15         unsigned int pid;
  16         int fd, i;
  17
  18         pid = getpid();
  19         s = as;
  20         while (*s++)
  21                 /* void */;
  22         s--;
  23         while (*--s == 'X') {
  24                 *s = (pid % 10) + '0';
  25                 pid /= 10;
  26         }
  27         s++;
  28         i = 'a';
  29         while ((fd = open(as, O_CREAT|O_EXCL|O_RDWR, 0600)) == -1) {
  30                 if (i == 'z')
  31                         return (-1);
  32                 *s = i++;
  33         }
  34         return (fd);
  35 }