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seedrng: fix for glibc <= 2.24 not providing getrandom()

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2023-04-10 17:26:04 +02:00
parent 85e4805ae9
commit 200a9669fb
1 changed files with 14 additions and 0 deletions
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14
miscutils/seedrng.c
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@ -45,6 +45,20 @@
#include <sys/random.h>
#include <sys/file.h>
/* Fix up glibc <= 2.24 not having getrandom() */
#if defined(__GLIBC__) && __GLIBC__ == 2 && __GLIBC_MINOR__ <= 24
#include <sys/syscall.h>
# define getrandom(...) bb_getrandom(__VA_ARGS__)
static ssize_t getrandom(void *buffer, size_t length, unsigned flags)
{
# if defined(__NR_getrandom)
return syscall(__NR_getrandom, buffer, length, flags);
# else
return ENOSYS;
# endif
}
#endif
#ifndef GRND_INSECURE
#define GRND_INSECURE 0x0004 /* Apparently some headers don't ship with this yet. */
#endif