[PATCH] uml: move tty logging to os-Linux

The serial UML OS-abstraction layer patch (um/kernel dir).

This moves all systemcalls from tty_log.c file under os-Linux dir

Signed-off-by: Gennady Sharapov <Gennady.V.Sharapov@intel.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 218 insertions, 0 deletions

diff --git a/arch/um/os-Linux/tty_log.c b/arch/um/os-Linux/tty_log.c
new file mode 100644
index 00000000000..c6ba56c1560
--- /dev/null
+++ b/arch/um/os-Linux/tty_log.c
@@ -0,0 +1,218 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com) and
+ * geoffrey hing <ghing@net.ohio-state.edu>
+ * Licensed under the GPL
+ */
+
+#include <errno.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/time.h>
+#include "init.h"
+#include "user.h"
+#include "kern_util.h"
+#include "os.h"
+
+#define TTY_LOG_DIR "./"
+
+/* Set early in boot and then unchanged */
+static char *tty_log_dir = TTY_LOG_DIR;
+static int tty_log_fd = -1;
+
+#define TTY_LOG_OPEN 1
+#define TTY_LOG_CLOSE 2
+#define TTY_LOG_WRITE 3
+#define TTY_LOG_EXEC 4
+
+#define TTY_READ 1
+#define TTY_WRITE 2
+
+struct tty_log_buf {
+        int what;
+        unsigned long tty;
+        int len;
+        int direction;
+        unsigned long sec;
+        unsigned long usec;
+};
+
+int open_tty_log(void *tty, void *current_tty)
+{
+        struct timeval tv;
+        struct tty_log_buf data;
+        char buf[strlen(tty_log_dir) + sizeof("01234567890-01234567\0")];
+        int fd;
+
+        gettimeofday(&tv, NULL);
+        if(tty_log_fd != -1){
+                data = ((struct tty_log_buf) { .what    = TTY_LOG_OPEN,
+                                               .tty  = (unsigned long) tty,
+                                               .len  = sizeof(current_tty),
+                                               .direction = 0,
+                                               .sec = tv.tv_sec,
+                                               .usec = tv.tv_usec } );
+                os_write_file(tty_log_fd, &data, sizeof(data));
+                os_write_file(tty_log_fd, &current_tty, data.len);
+                return(tty_log_fd);
+        }
+
+        sprintf(buf, "%s/%0u-%0u", tty_log_dir, (unsigned int) tv.tv_sec,
+                (unsigned int) tv.tv_usec);
+
+        fd = os_open_file(buf, of_append(of_create(of_rdwr(OPENFLAGS()))),
+                          0644);
+        if(fd < 0){
+                printk("open_tty_log : couldn't open '%s', errno = %d\n",
+                       buf, -fd);
+        }
+        return(fd);
+}
+
+void close_tty_log(int fd, void *tty)
+{
+        struct tty_log_buf data;
+        struct timeval tv;
+
+        if(tty_log_fd != -1){
+                gettimeofday(&tv, NULL);
+                data = ((struct tty_log_buf) { .what    = TTY_LOG_CLOSE,
+                                               .tty  = (unsigned long) tty,
+                                               .len  = 0,
+                                               .direction = 0,
+                                               .sec = tv.tv_sec,
+                                               .usec = tv.tv_usec } );
+                os_write_file(tty_log_fd, &data, sizeof(data));
+                return;
+        }
+        os_close_file(fd);
+}
+
+static int log_chunk(int fd, const char *buf, int len)
+{
+        int total = 0, try, missed, n;
+        char chunk[64];
+
+        while(len > 0){
+                try = (len > sizeof(chunk)) ? sizeof(chunk) : len;
+                missed = copy_from_user_proc(chunk, (char *) buf, try);
+                try -= missed;
+                n = os_write_file(fd, chunk, try);
+                if(n != try) {
+                        if(n < 0)
+                                return(n);
+                        return(-EIO);
+                }
+                if(missed != 0)
+                        return(-EFAULT);
+
+                len -= try;
+                total += try;
+                buf += try;
+        }
+
+        return(total);
+}
+
+int write_tty_log(int fd, const char *buf, int len, void *tty, int is_read)
+{
+        struct timeval tv;
+        struct tty_log_buf data;
+        int direction;
+
+        if(fd == tty_log_fd){
+                gettimeofday(&tv, NULL);
+                direction = is_read ? TTY_READ : TTY_WRITE;
+                data = ((struct tty_log_buf) { .what    = TTY_LOG_WRITE,
+                                               .tty  = (unsigned long) tty,
+                                               .len  = len,
+                                               .direction = direction,
+                                               .sec = tv.tv_sec,
+                                               .usec = tv.tv_usec } );
+                os_write_file(tty_log_fd, &data, sizeof(data));
+        }
+
+        return(log_chunk(fd, buf, len));
+}
+
+void log_exec(char **argv, void *tty)
+{
+        struct timeval tv;
+        struct tty_log_buf data;
+        char **ptr,*arg;
+        int len;
+
+        if(tty_log_fd == -1) return;
+
+        gettimeofday(&tv, NULL);
+
+        len = 0;
+        for(ptr = argv; ; ptr++){
+                if(copy_from_user_proc(&arg, ptr, sizeof(arg)))
+                        return;
+                if(arg == NULL) break;
+                len += strlen_user_proc(arg);
+        }
+
+        data = ((struct tty_log_buf) { .what    = TTY_LOG_EXEC,
+                                       .tty  = (unsigned long) tty,
+                                       .len  = len,
+                                       .direction = 0,
+                                       .sec = tv.tv_sec,
+                                       .usec = tv.tv_usec } );
+        os_write_file(tty_log_fd, &data, sizeof(data));
+
+        for(ptr = argv; ; ptr++){
+                if(copy_from_user_proc(&arg, ptr, sizeof(arg)))
+                        return;
+                if(arg == NULL) break;
+                log_chunk(tty_log_fd, arg, strlen_user_proc(arg));
+        }
+}
+
+extern void register_tty_logger(int (*opener)(void *, void *),
+                                int (*writer)(int, const char *, int,
+                                              void *, int),
+                                void (*closer)(int, void *));
+
+static int register_logger(void)
+{
+        register_tty_logger(open_tty_log, write_tty_log, close_tty_log);
+        return(0);
+}
+
+__uml_initcall(register_logger);
+
+static int __init set_tty_log_dir(char *name, int *add)
+{
+        tty_log_dir = name;
+        return 0;
+}
+
+__uml_setup("tty_log_dir=", set_tty_log_dir,
+"tty_log_dir=<directory>\n"
+"    This is used to specify the directory where the logs of all pty\n"
+"    data from this UML machine will be written.\n\n"
+);
+
+static int __init set_tty_log_fd(char *name, int *add)
+{
+        char *end;
+
+        tty_log_fd = strtoul(name, &end, 0);
+        if((*end != '\0') || (end == name)){
+                printf("set_tty_log_fd - strtoul failed on '%s'\n", name);
+                tty_log_fd = -1;
+        }
+
+        *add = 0;
+        return 0;
+}
+
+__uml_setup("tty_log_fd=", set_tty_log_fd,
+"tty_log_fd=<fd>\n"
+"    This is used to specify a preconfigured file descriptor to which all\n"
+"    tty data will be written.  Preconfigure the descriptor with something\n"
+"    like '10>tty_log tty_log_fd=10'.\n\n"
+);