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Annotation of researchv10no/cmd/renice.c, revision 1.1.1.1

1.1       root        1: #include <stdio.h>
                      2: #include <errno.h>
                      3: #include <sys/pioctl.h>
                      4: #include <sys/param.h>
                      5: #include <sys/types.h>
                      6: #include <sys/vtimes.h>
                      7: #include <sys/proc.h>
                      8: 
                      9: extern int errno;
                     10: 
                     11: char *progname, procname[16]; struct proc p; int nerrors;
                     12: 
                     13: main(argc, argv)
                     14: char **argv;
                     15: {
                     16:        int fd, pri = NZERO-1, dpri;
                     17:        progname = *argv;
                     18:        if (argv[1]) {
                     19:                if (argv[1][0] == '-')
                     20:                        pri = atoi(*++argv+1);
                     21:        } else
                     22:                error();
                     23:        while (*++argv) {
                     24:                sprintf(procname, "/proc/%05d", atoi(*argv));
                     25:                if ((fd = open(procname, 0)) < 0 ||
                     26:                    ioctl(fd, PIOCGETPR, &p) < 0 ||
                     27:                    (dpri = pri + NZERO - p.p_nice,
                     28:                    ioctl(fd, PIOCNICE, &dpri)) < 0)
                     29:                        error();
                     30:                close(fd);
                     31:        }
                     32:        exit(nerrors != 0);
                     33: }
                     34: 
                     35: error()
                     36: {
                     37:        switch (errno) {
                     38:        case 0:
                     39:                fprintf(stderr, "usage: %s [ -pri ] pid ...\n", progname); break;
                     40:        case EACCES:
                     41:        case EPERM:
                     42:                fprintf(stderr, "%s: no permission\n", procname); break;
                     43:        case ENOENT:
                     44:                fprintf(stderr, "%s: no such process\n", procname); break;
                     45:        default:
                     46:                fprintf(stderr, "%s: unexpected error %d\n", procname, errno);
                     47:        }
                     48:        ++nerrors;
                     49: }

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