Mercurial > hg > toybox
view toys/oneit.c @ 186:25447caf1b4b
Change command main() functions to return void, and exit(toys.exitval) from
the toybox infrastructure instead. Eliminates a return call from each command.
author | Rob Landley <rob@landley.net> |
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date | Thu, 29 Nov 2007 18:14:37 -0600 |
parents | 1e8f4b05cb65 |
children | 30a6db5a95c2 |
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/* oneit.c, tiny one-process init replacement. * * Copyright 2005 by Rob Landley <rob@landley.net>. */ #include "toys.h" #include <sys/reboot.h> // The minimum amount of work necessary to get ctrl-c and such to work is: // // - Fork a child (PID 1 is special: can't exit, has various signals blocked). // - Do a setsid() (so we have our own session). // - In the child, attach stdio to /dev/tty0 (/dev/console is special) // - Exec the rest of the command line. // // PID 1 then reaps zombies until the child process it spawned exits, at which // point it calls sync() and reboot(). I could stick a kill -1 in there. void oneit_main(void) { int i; pid_t pid; // Create a new child process. pid = vfork(); if (pid) { // pid 1 just reaps zombies until it gets its child, then halts the system. while (pid!=wait(&i)); sync(); reboot(toys.optflags ? RB_POWER_OFF : RB_AUTOBOOT); } // Redirect stdio to /dev/tty0, with new session ID, so ctrl-c works. setsid(); for (i=0; i<3; i++) { close(i); open("/dev/tty0",O_RDWR); } // Can't xexec() here, because we vforked so we don't want to error_exit(). toy_exec(toys.optargs); execvp(*toys.optargs, toys.optargs); _exit(127); }