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Annotation of coherent/g/usr/lib/misc/bedaemon.c, revision 1.1.1.1

1.1       root        1: /* 
                      2:  * Disassociate from controling terminal and process
                      3:  * group. Close all open files.
                      4:  */
                      5: #include       <stdio.h>
                      6: #include       <signal.h>
                      7: #include       <kernel/param.h>
                      8: 
                      9: bedaemon()
                     10: {
                     11:        int     child_pid;
                     12:        int     fd;
                     13:        
                     14:        /* Daemon does its own sigsetup. Do it to be standard module for all 
                     15:         * daemon processes do this extra signal here.
                     16:         */
                     17:        signal(SIGHUP, SIG_IGN);        /* immune from the group leader death */
                     18: 
                     19:        /* When we did not start from background fork and let parent die. */
                     20:        if ((child_pid = fork()) < 0) {
                     21:                fprintf(stderr, "cron: cannot fork\n");
                     22:                exit(1);
                     23:        } else
                     24:                if (child_pid > 0)      /* parent */
                     25:                        exit(0);
                     26:        
                     27:        /* Disassociate from controlling terminal & process group */
                     28:        setpgrp();
                     29:        
                     30:        /* This fork should garantee that process can't reacquire a new 
                     31:         * controlling terminal.
                     32:         */
                     33:        if ((child_pid = fork()) < 0) {
                     34:                fprintf(stderr, "cron: cannot fork\n");
                     35:                exit(1);
                     36:        } else
                     37:                if (child_pid > 0)      /* parent */
                     38:                        exit(0);
                     39:        
                     40:        /* Close all open files, chdir "/", and umask(0). */
                     41:        for (fd = 0; fd < NOFILE; fd++)
                     42:                close(fd);
                     43:        
                     44:        chdir("/");
                     45:        umask(0);       /* We do not want any surprise with file creation */
                     46: }
                     47: 
                     48: #ifdef TEST
                     49: main()
                     50: {
                     51:        bedaemon();
                     52:        sleep(100);
                     53: }
                     54: #endif
                     55: 
                     56: 
                     57: 
                     58: 
                     59: 

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