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#include <unistd.h>
ssize_t pread(int fd, void *buf, size_t nbytes, off_t offset);
/* Returns: number of bytes read, 0 if end of file, −1 on error */
ssize_t pwrite(int fd, const void *buf, size_t nbytes, off_t offset);
/* Returns: number of bytes written if OK, −1 on error */
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