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a46a3a2668
This makes it a compile-time error to call a function that semantically takes no parameters with a nonzero number of arguments. Previously, such code would still compile, but risk blowing up the stack if a compiler chose to use something other than caller-cleanup calling conventions.
50 lines
933 B
C
50 lines
933 B
C
#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/syscall.h>
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#include <sys/mman.h>
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#include "kvmfr.h"
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int main(void)
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{
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int fd = open("/dev/kvmfr0", O_RDWR);
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if (fd < 0)
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{
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perror("open");
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return -1;
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}
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unsigned long size = ioctl(fd, KVMFR_DMABUF_GETSIZE , 0);
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printf("Size: %lu MiB\n", size / 1024 / 1024);
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struct kvmfr_dmabuf_create create =
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{
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.flags = KVMFR_DMABUF_FLAG_CLOEXEC,
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.offset = 0x0,
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.size = size,
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};
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int dmaFd = ioctl(fd, KVMFR_DMABUF_CREATE, &create);
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if (dmaFd < 0)
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{
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perror("ioctl");
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return -1;
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}
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void * mem = mmap(NULL, create.size, PROT_READ | PROT_WRITE, MAP_SHARED, dmaFd, 0);
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if (!mem)
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{
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perror("mmap");
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return -1;
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}
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memset(mem, 0xAA, create.size);
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munmap(mem, create.size);
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close(fd);
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return 0;
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} |