ClickHouse/base/glibc-compatibility/musl/getrandom.c

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/** We have to replace glibc getrandom only when glibc version is higher than 2.25.
* In previous versions of glibc this function doesn't exist
* and old kernels may be missing SYS_getrandom syscall.
*/
#include <features.h>
#if defined(__GLIBC__) && __GLIBC__ >= 2
# define GLIBC_MINOR __GLIBC_MINOR__
#elif defined (__GNU_LIBRARY__) && __GNU_LIBRARY__ >= 2
# define GLIBC_MINOR __GNU_LIBRARY_MINOR__
#endif
#if defined(GLIBC_MINOR) && GLIBC_MINOR >= 25
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#include <unistd.h>
#include <syscall.h>
#include "syscall.h"
ssize_t getrandom(void *buf, size_t buflen, unsigned flags)
{
/// There was cancellable syscall (syscall_cp), but I don't care too.
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return syscall(SYS_getrandom, buf, buflen, flags);
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}
#endif