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Fix build with musl and older Linux kernel #82

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Fix build with musl and older Linux kernel #82

wants to merge 1 commit into from

Commits on Sep 29, 2017

  1. Fix build with musl and older Linux kernel 

    The musl libc carries its own copy of Linux system calls. When building
with Linux headers older than v3.17, musl provides SYS_getrandom
definition, but not GRND_NONBLOCK. This causes build failure for
libressl and openntpd:

getentropy_linux.c: In function 'getentropy_getrandom':
getentropy_linux.c:205:42: error: 'GRND_NONBLOCK' undeclared (first use in this function)
   ret = syscall(SYS_getrandom, buf, len, GRND_NONBLOCK);
                                          ^~~~~~~~~~~~~

Define GRND_NONBLOCK locally when its definition is missing to fix the
build. There should be no run-time effect. Older kernels return ENOSYS
for unsupported syscall().
    @baruchsiach
    baruchsiach committed Sep 29, 2017
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