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8cedf411c4
A standard libc would normally use the kernel's syscall interface to connect with the lower level, and this interface would usually imitate POSIX or a similar style. With the statically-linked unikernel design, the syscalls would be functions, but the interface wouldn't change much. However, there are some fundamental differences. For instance, in gint there aren't separate kernel/userspace memory allocators, there's just a unified allocator in the kernel. This makes malloc() conceptually a direct syscall, which pushes the kernel/libc boundary at an unusual location. Having a clearly-marked HAL makes it easier to identify where the boundary is. Code from <time.h> currently has an ad-hoc interface which should be replaced with clock_gettime(2) in the future. The HAL offers default implementations but these aren't used by gint yet, because it's more practical to have undefined references than to end up with the stubs in an executable. These are provided for future completeness. This change does not lift the requirement to recursively link gint with the libc and the libc with gint.
15 lines
239 B
C
15 lines
239 B
C
#include <time.h>
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#include <fxlibc/hal.h>
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static clock_t clock_init;
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__attribute__((constructor))
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static void clock_initialize(void)
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{
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clock_init = fxlibc_hal_clock();
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}
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clock_t clock(void)
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{
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return fxlibc_hal_clock() - clock_init;
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}
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