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Annotation of coherent/d/usr/src/examples/execve.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * execve(), tmpnam(), getenv(), path() example for the COHERENT.
                      3:  * find all lines with more than LIMIT characters and call 'me'
                      4:  * to edit them.
                      5:  */
                      6: #include <stdio.h>
                      7: #include <path.h>
                      8: #include <sys/stat.h>
                      9: 
                     10: #define LIMIT 70
                     11: 
                     12: extern char *getenv(), **environ, *tempnam();
                     13: 
                     14: main(argc, argv)
                     15: char *argv[];
                     16: {
                     17:        /*                me     -e   tmp   file */
                     18:        char *cmda[5] = { NULL, "-e", NULL, NULL, NULL };
                     19:        FILE *ifp, *tmp;
                     20:        char line[256];
                     21:        int  ct, len;
                     22: 
                     23:        if ((NULL == (cmda[3] = argv[1])) ||
                     24:            (NULL == (ifp = fopen(argv[1], "r")))) {
                     25:                fprintf(stderr, "Cannot open %s\n", argv[1]);
                     26:                exit(1);
                     27:        }
                     28: 
                     29:        if (NULL == (cmda[0] = path(getenv("PATH"), "me", AEXEC))) {
                     30:                fprintf(stderr, "Cannot locate me\n");
                     31:                exit(1);
                     32:        }
                     33: 
                     34:        if (NULL == (tmp = fopen((cmda[2] = tempnam(NULL, "lng")), "w"))) {
                     35:                fprintf(stderr, "Cannot open tmpfile\n");
                     36:                exit(1);
                     37:        }
                     38: 
                     39:        for (ct = 1; NULL != fgets(line, sizeof(line), ifp); ct++)
                     40:                if (((len = strlen(line)) > LIMIT) ||
                     41:                    ('\n' != line[len -1]))
                     42:                        fprintf(tmp, "%d: %d characters long\n", ct, len);
                     43: 
                     44:        fclose(tmp);
                     45:        fclose(ifp);
                     46: 
                     47:        if (execve(cmda[0], cmda, environ) < 0) {
                     48:                fprintf(stderr, "cannot execute me\n");
                     49:                exit(1);
                     50:        }
                     51:        /* We never reach here ! */
                     52: }

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