Release 4.14 arch/um/os-Linux/util.c

/*
 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Licensed under the GPL
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include <string.h>
#include <termios.h>
#include <wait.h>
#include <sys/mman.h>
#include <sys/utsname.h>
#include <init.h>
#include <os.h>



void stack_protections(unsigned long address)
{
	if (mprotect((void *) address, UM_THREAD_SIZE,
		    PROT_READ | PROT_WRITE | PROT_EXEC) < 0)
		panic("protecting stack failed, errno = %d", errno);
}

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int raw(int fd)
{
	struct termios tt;
	int err;

	CATCH_EINTR(err = tcgetattr(fd, &tt));
	if (err < 0)
		return -errno;

	cfmakeraw(&tt);

	CATCH_EINTR(err = tcsetattr(fd, TCSADRAIN, &tt));
	if (err < 0)
		return -errno;

	/*
         * XXX tcsetattr could have applied only some changes
         * (and cfmakeraw() is a set of changes)
         */
	return 0;
}

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Jeff Dike
53
72.60%
3
60.00%
Paolo 'Blaisorblade' Giarrusso
20
27.40%
2
40.00%
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73
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5
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void setup_machinename(char *machine_out)
{
	struct utsname host;

	uname(&host);
#ifdef UML_CONFIG_UML_X86
# ifndef UML_CONFIG_64BIT
	if (!strcmp(host.machine, "x86_64")) {
		strcpy(machine_out, "i686");
		return;
	}
# else
	if (!strcmp(host.machine, "i686")) {
		strcpy(machine_out, "x86_64");
		return;
	}
# endif
#endif
	strcpy(machine_out, host.machine);
}

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Paolo 'Blaisorblade' Giarrusso
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66.67%
2
66.67%
Jeff Dike
28
33.33%
1
33.33%
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84
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3
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void setup_hostinfo(char *buf, int len)
{
	struct utsname host;

	uname(&host);
	snprintf(buf, len, "%s %s %s %s %s", host.sysname, host.nodename,
		 host.release, host.version, host.machine);
}

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Jeff Dike
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/*
 * We cannot use glibc's abort(). It makes use of tgkill() which
 * has no effect within UML's kernel threads.
 * After that glibc would execute an invalid instruction to kill
 * the calling process and UML crashes with SIGSEGV.
 */

static inline void __attribute__ ((noreturn)) uml_abort(void)
{
	sigset_t sig;

	fflush(NULL);

	if (!sigemptyset(&sig) && !sigaddset(&sig, SIGABRT))
		sigprocmask(SIG_UNBLOCK, &sig, 0);

	for (;;)
		if (kill(getpid(), SIGABRT) < 0)
			exit(127);
}

/*
 * UML helper threads must not handle SIGWINCH/INT/TERM
 */


void os_fix_helper_signals(void)
{
	signal(SIGWINCH, SIG_IGN);
	signal(SIGINT, SIG_DFL);
	signal(SIGTERM, SIG_DFL);
}

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void os_dump_core(void)
{
	int pid;

	signal(SIGSEGV, SIG_DFL);

	/*
         * We are about to SIGTERM this entire process group to ensure that
         * nothing is around to run after the kernel exits.  The
         * kernel wants to abort, not die through SIGTERM, so we
         * ignore it here.
         */

	signal(SIGTERM, SIG_IGN);
	kill(0, SIGTERM);
	/*
         * Most of the other processes associated with this UML are
         * likely sTopped, so give them a SIGCONT so they see the
         * SIGTERM.
         */
	kill(0, SIGCONT);

	/*
         * Now, having sent signals to everyone but us, make sure they
         * die by ptrace.  Processes can survive what's been done to
         * them so far - the mechanism I understand is receiving a
         * SIGSEGV and segfaulting immediately upon return.  There is
         * always a SIGSEGV pending, and (I'm guessing) signals are
         * processed in numeric order so the SIGTERM (signal 15 vs
         * SIGSEGV being signal 11) is never handled.
         *
         * Run a waitpid loop until we get some kind of error.
         * Hopefully, it's ECHILD, but there's not a lot we can do if
         * it's something else.  Tell os_kill_ptraced_process not to
         * wait for the child to report its death because there's
         * nothing reasonable to do if that fails.
         */

	while ((pid = waitpid(-1, NULL, WNOHANG | __WALL)) > 0)
		os_kill_ptraced_process(pid, 0);

	uml_abort();
}

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Lepton Wu
52
73.24%
1
25.00%
Jeff Dike
16
22.54%
1
25.00%
Stanislaw W. Gruszka
2
2.82%
1
25.00%
Richard Weinberger
1
1.41%
1
25.00%
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71
100.00%
4
100.00%



void um_early_printk(const char *s, unsigned int n)
{
	printf("%.*s", n, s);
}

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Richard Weinberger
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static int quiet_info;



static int __init quiet_cmd_param(char *str, int *add)
{
	quiet_info = 1;
	return 0;
}

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Masami Hiramatsu
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__uml_setup("quiet", quiet_cmd_param,
"quiet\n"
"    Turns off information messages during boot.\n\n");



void os_info(const char *fmt, ...)
{
	va_list list;

	if (quiet_info)
		return;

	va_start(list, fmt);
	vfprintf(stderr, fmt, list);
	va_end(list);
}

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Masami Hiramatsu
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void os_warn(const char *fmt, ...)
{
	va_list list;

	va_start(list, fmt);
	vfprintf(stderr, fmt, list);
	va_end(list);
}
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Masami Hiramatsu
36
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36
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Overall Contributors
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Commits
CommitProp
Jeff Dike
215
36.32%
7
36.84%
Richard Weinberger
130
21.96%
3
15.79%
Masami Hiramatsu
116
19.59%
2
10.53%
Paolo 'Blaisorblade' Giarrusso
76
12.84%
4
21.05%
Lepton Wu
52
8.78%
1
5.26%
Stanislaw W. Gruszka
2
0.34%
1
5.26%
Al Viro
1
0.17%
1
5.26%
Total
592
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19
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Directory: arch/um/os-Linux

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