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the last parts of the C standard library

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pommicket 2022-02-16 22:58:16 -05:00
parent b1e837afb4
commit 6e1158f49a
8 changed files with 361 additions and 32 deletions
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4
05/stdio.h
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@ -1739,7 +1739,9 @@ int rename(const char *old, const char *new) {
char *tmpnam(char *s) {
struct timespec t = {0};
do {
do {
// NB: we can't use rand() here because
// "The implementation shall behave as if no library function calls the rand function." C89 § 4.10.2.1
clock_gettime(CLOCK_MONOTONIC, &t); // use clock as a source of randomness
sprintf(s, "/tmp/C_%06u", t.tv_nsec % 1000000);
} while (access(s, F_OK) == 0); // if file exists, generate a new name