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   read.3p    ( 3 )

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Примеры (Examples)

Reading Data into a Buffer
       The following example reads data from the file associated with
       the file descriptor fd into the buffer pointed to by buf.

           #include <sys/types.h>
           #include <unistd.h>
           ...
           char buf[20];
           size_t nbytes;
           ssize_t bytes_read;
           int fd;
           ...
           nbytes = sizeof(buf);
           bytes_read = read(fd, buf, nbytes);
           ...