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Annotation of Net2/tests/benchmarks/seqrewrite.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Sequential I/O benchmark.
                      3:  *
                      4:  * Overwrites existing data in a file.
                      5:  */
                      6: #include <sys/types.h>
                      7: #include <sys/file.h>
                      8: #include <sys/stat.h>
                      9: 
                     10: char   *malloc();
                     11: 
                     12: main(argc, argv)
                     13:        char *argv[];
                     14: {
                     15:        register int i, max;
                     16:        char *buf;
                     17:        struct stat sb;
                     18:        int fd;
                     19: 
                     20:        if (argc < 2) {
                     21:                printf("usage: %s file\n", argv[0]);
                     22:                exit(1);
                     23:        }
                     24:        fd = open(argv[1], O_WRONLY, 0644);
                     25:        if (fd < 0) {
                     26:                perror(argv[1]);
                     27:                exit(1);
                     28:        }
                     29:        fstat(fd, &sb);
                     30:        buf = malloc(sb.st_blksize);
                     31:        max = sb.st_size / sb.st_blksize;
                     32:        printf("%d writes of %d kilobytes\n", max, sb.st_blksize / 1024);
                     33:        for (i = 0; i < max; i++)
                     34:                write(fd, buf, sb.st_blksize);
                     35: }

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