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tools
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regression
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nfsmmap
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test1
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Makefile
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test1.c
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test1.good.uu
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test1.zeros.uu
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Editing: test1.c
#include <sys/types.h> #include <sys/fcntl.h> #include <sys/mman.h> #include <unistd.h> int main(int argc, char** argv) { int fd, fd2; caddr_t addr; char zeros[4096]; char ones[200]; memset(zeros, 0, sizeof zeros); memset(ones, 1, sizeof ones); #if 0 unlink("test1.data"); fd = open("test1.data", O_RDWR|O_CREAT, 0666); if (fd < 0) err(1, "creating file"); if (write(fd, zeros, sizeof zeros) < 0) err(1, "writing zeros"); close(fd); #endif fd = open("test1.data", O_RDWR); if (fd < 0) err(1, "opening file"); if (lseek(fd, 600, SEEK_SET) < 0) err(1, "seeking"); if (write(fd, ones, sizeof ones) < 0) err(1, "writing ones"); fsync(fd); addr = mmap(0, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); if (addr == MAP_FAILED) err(1, "mapping"); unlink("test1.scratch"); fd2 = open("test1.scratch", O_RDWR|O_CREAT, 0666); if (fd2 < 0) err(1, "creating scratch"); if (write(fd2, addr, 4096) < 0) err(1, "writing scratch"); }
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