main.c

unix环境高级编程的源代码

#include    "open.h"
#include    <fcntl.h>
#include    <string.h>

#define    BUFFSIZE    8192

int
main(int argc, char *argv[])
{
    int        n, fd;
    char    buf[BUFFSIZE], line[MAXLINE];

                    /* read filename to cat from stdin */
    while (fgets(line, MAXLINE, stdin) != NULL) {
        line[strlen(line) - 1] = 0;    /* replace newline with null */

                    /* open the file */
        if ( (fd = csopen(line, O_RDONLY)) < 0)
            continue;    /* csopen() prints error from server */

                    /* and cat to stdout */
        while ( (n = read(fd, buf, BUFFSIZE)) > 0)
            if (write(STDOUT_FILENO, buf, n) != n)
                err_sys("write error");
        if (n < 0)
            err_sys("read error");
        close(fd);
    }

    exit(0);
}