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Annotation of researchv10no/cmd/odist/ape/transmit.c, revision 1.1

1.1     ! root        1: #include <stdio.h>
        !             2: #include <sys/types.h>
        !             3: #include <sys/stat.h>
        !             4: #include <fcntl.h>
        !             5: #include <unistd.h>
        !             6: #include "dist.h"
        !             7: 
        !             8: static void
        !             9: sendjob(char *job, int num, char *sys)
        !            10: {
        !            11:        char busy[MAXNAME], done[MAXNAME], mesg[MAXLINE];
        !            12:        int fd, attempt;
        !            13: 
        !            14:        sprintf(busy, "%d.%s", num, BUSY);
        !            15:        sprintf(done, "%d.%s", num, DONE);
        !            16: 
        !            17:        fd = lcreat(busy, 0600);
        !            18:        if (fd < 0)
        !            19:                return;
        !            20:        dup2(fd, 2);
        !            21:        close(fd);
        !            22: 
        !            23:        /* avoid race condition */
        !            24:        if (access(done, F_OK) == 0)
        !            25:                goto out;
        !            26: 
        !            27:        fd = open(DATA, O_RDONLY);
        !            28:        if (fd < 0)
        !            29:                goto out;
        !            30: 
        !            31:        if (!chkperm(fd)) {
        !            32:                close(fd);
        !            33:                goto out;
        !            34:        }
        !            35: 
        !            36:        sprintf(mesg, "begin job %s\n", job);
        !            37:        write(1, mesg, strlen(mesg));
        !            38: 
        !            39:        if (!sendfile(fd))
        !            40:                goto err;
        !            41: 
        !            42:        if (!getline(mesg) || sscanf(mesg, "client attempt=%d\n", &attempt) != 1)
        !            43:                goto err;
        !            44:        if (!attempt)
        !            45:                goto out;
        !            46: 
        !            47:        if (!recvfile(2))
        !            48:                goto err;
        !            49: 
        !            50:        rename(busy, done);
        !            51: 
        !            52:        fd = open("/dev/null", O_WRONLY);
        !            53:        dup2(fd, 2);
        !            54:        close(fd);
        !            55:        return;
        !            56: 
        !            57:  out:
        !            58:        /* continue with the next job */
        !            59:        remove(busy);
        !            60:        return;
        !            61: 
        !            62:  err:
        !            63:        /* failure that's too hard to resynchronize */
        !            64:        eprintf("sendjob really barfed");
        !            65:        remove(busy);
        !            66:        exit(1);
        !            67: }
        !            68: 
        !            69: int
        !            70: main(int argc, char *argv[])
        !            71: {
        !            72:        prog = argv[0];
        !            73:        if (argc < 2) {
        !            74:                eprintf("usage: transmit system");
        !            75:                return 1;
        !            76:        }
        !            77:        scanq(argv[1], sendjob);
        !            78:        return 0;
        !            79: }

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