21 lines
498 B
C
21 lines
498 B
C
#define _FILE_OFFSET_BITS 64
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#include <sys/types.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include "mstorage.h"
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int mstorage_init_persistent(mstorage_t* p,int fd) {
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off_t o;
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p->fd=fd;
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o=lseek(fd,0,SEEK_END);
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if (o==-1) return -1;
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p->mapped=p->used=o;
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if (p->mapped==0) {
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p->mapped=4096;
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if (lseek(fd,4095,SEEK_SET)==-1 || write(fd,"",1)!=1) return -1;
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}
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p->root=mmap(0,p->mapped,PROT_READ|PROT_WRITE,MAP_SHARED,fd,0);
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if (p->root==(char*)-1) return -1;
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return 0;
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}
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