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Linux: getrandom syscall number is always available

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Due to the built-in tables, __NR_getrandom is always defined.

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
This commit is contained in:
Florian Weimer
2020-03-03 12:15:38 +01:00
parent d241dee4dd
commit 658b5848a8
2 changed files with 0 additions and 22 deletions
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9
sysdeps/unix/sysv/linux/getentropy.c
View File

@ -21,7 +21,6 @@
#include <errno.h> #include <errno.h>
#include <unistd.h> #include <unistd.h>
#ifdef __NR_getrandom
/* Write LENGTH bytes of randomness starting at BUFFER. Return 0 on /* Write LENGTH bytes of randomness starting at BUFFER. Return 0 on
success and -1 on failure. */ success and -1 on failure. */
int int
@ -63,11 +62,3 @@ getentropy (void *buffer, size_t length)
} }
return 0; return 0;
} }
#else
int
getentropy (void *buffer, size_t length)
{
__set_errno (ENOSYS);
return -1;
}
#endif

13
sysdeps/unix/sysv/linux/getrandom.c
View File

@ -21,7 +21,6 @@
#include <unistd.h> #include <unistd.h>
#include <sysdep-cancel.h> #include <sysdep-cancel.h>
#ifdef __NR_getrandom
/* Write up to LENGTH bytes of randomness starting at BUFFER. /* Write up to LENGTH bytes of randomness starting at BUFFER.
Return the number of bytes written, or -1 on error. */ Return the number of bytes written, or -1 on error. */
ssize_t ssize_t
@ -29,17 +28,5 @@ __getrandom (void *buffer, size_t length, unsigned int flags)
{ {
return SYSCALL_CANCEL (getrandom, buffer, length, flags); return SYSCALL_CANCEL (getrandom, buffer, length, flags);
} }
#else
/* Always provide a definition, even if the kernel headers lack the
system call number. */
ssize_t
__getrandom (void *buffer, size_t length, unsigned int flags)
{
/* Ideally, we would add a cancellation point here, but we currently
cannot do so inside libc. */
__set_errno (ENOSYS);
return -1;
}
#endif
libc_hidden_def (__getrandom) libc_hidden_def (__getrandom)
weak_alias (__getrandom, getrandom) weak_alias (__getrandom, getrandom)