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ad11db2ee1
Apparently Ubuntu 20 has upgraded to kernel 5.15, but still builds things with 5.4 headers. Signed-off-by: Zygo Blaxell <bees@furryterror.org>
41 lines
707 B
C++
41 lines
707 B
C++
#include "crucible/openat2.h"
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#include <sys/syscall.h>
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// Compatibility for building on old libc for new kernel
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#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 6, 0)
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// Every arch that defines this uses 437, except Alpha, where 437 is
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// mq_getsetattr.
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#ifndef SYS_openat2
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#ifdef __alpha__
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#define SYS_openat2 547
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#else
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#define SYS_openat2 437
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#endif
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#endif
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#endif // Linux version >= v5.6
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#include <fcntl.h>
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#include <unistd.h>
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extern "C" {
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int
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__attribute__((weak))
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openat2(int const dirfd, const char *const pathname, struct open_how *const how, size_t const size)
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throw()
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{
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#ifdef SYS_openat2
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return syscall(SYS_openat2, dirfd, pathname, how, size);
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#else
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errno = ENOSYS;
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return -1;
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#endif
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}
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};
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