2 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
14 #include <sys/utsname.h>
15 #include "kern_constants.h"
19 void stack_protections(unsigned long address
)
21 if (mprotect((void *) address
, UM_THREAD_SIZE
,
22 PROT_READ
| PROT_WRITE
| PROT_EXEC
) < 0)
23 panic("protecting stack failed, errno = %d", errno
);
31 CATCH_EINTR(err
= tcgetattr(fd
, &tt
));
37 CATCH_EINTR(err
= tcsetattr(fd
, TCSADRAIN
, &tt
));
44 void setup_machinename(char *machine_out
)
49 #ifdef UML_CONFIG_UML_X86
50 # ifndef UML_CONFIG_64BIT
51 if (!strcmp(host
.machine
, "x86_64")) {
52 strcpy(machine_out
, "i686");
56 if (!strcmp(host
.machine
, "i686")) {
57 strcpy(machine_out
, "x86_64");
62 strcpy(machine_out
, host
.machine
);
65 void setup_hostinfo(char *buf
, int len
)
70 snprintf(buf
, len
, "%s %s %s %s %s", host
.sysname
, host
.nodename
,
71 host
.release
, host
.version
, host
.machine
);
74 void os_dump_core(void)
78 signal(SIGSEGV
, SIG_DFL
);
81 * We are about to SIGTERM this entire process group to ensure that
82 * nothing is around to run after the kernel exits. The
83 * kernel wants to abort, not die through SIGTERM, so we
87 signal(SIGTERM
, SIG_IGN
);
90 * Most of the other processes associated with this UML are
91 * likely sTopped, so give them a SIGCONT so they see the
97 * Now, having sent signals to everyone but us, make sure they
98 * die by ptrace. Processes can survive what's been done to
99 * them so far - the mechanism I understand is receiving a
100 * SIGSEGV and segfaulting immediately upon return. There is
101 * always a SIGSEGV pending, and (I'm guessing) signals are
102 * processed in numeric order so the SIGTERM (signal 15 vs
103 * SIGSEGV being signal 11) is never handled.
105 * Run a waitpid loop until we get some kind of error.
106 * Hopefully, it's ECHILD, but there's not a lot we can do if
107 * it's something else. Tell os_kill_ptraced_process not to
108 * wait for the child to report its death because there's
109 * nothing reasonable to do if that fails.
112 while ((pid
= waitpid(-1, NULL
, WNOHANG
| __WALL
)) > 0)
113 os_kill_ptraced_process(pid
, 0);