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random: Check fwrite return value to avoid warnings

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Some compilers complain about fwrite calls if the return value is
not checked, so check the value even if it does not really make
much of a difference in this particular case.
This commit is contained in:
Jouni Malinen 2011-08-06 21:16:31 +03:00
parent 6921f1f386
commit 2e92310217
1 changed files with 9 additions and 2 deletions
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11
src/crypto/random.c
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@ -354,6 +354,7 @@ static void random_write_entropy(void)
char buf[RANDOM_ENTROPY_SIZE]; char buf[RANDOM_ENTROPY_SIZE];
FILE *f; FILE *f;
u8 opr; u8 opr;
int fail = 0;
if (!random_entropy_file) if (!random_entropy_file)
return; return;
@ -369,9 +370,15 @@ static void random_write_entropy(void)
} }
opr = own_pool_ready > 0xff ? 0xff : own_pool_ready; opr = own_pool_ready > 0xff ? 0xff : own_pool_ready;
fwrite(&opr, 1, 1, f); if (fwrite(&opr, 1, 1, f) != 1 ||
fwrite(buf, RANDOM_ENTROPY_SIZE, 1, f); fwrite(buf, RANDOM_ENTROPY_SIZE, 1, f) != 1)
fail = 1;
fclose(f); fclose(f);
if (fail) {
wpa_printf(MSG_ERROR, "random: Could not entropy data to %s",
random_entropy_file);
return;
}
wpa_printf(MSG_DEBUG, "random: Updated entropy file %s " wpa_printf(MSG_DEBUG, "random: Updated entropy file %s "
"(own_pool_ready=%u)", "(own_pool_ready=%u)",