Host.cpp revision 7e9964783acae183c23a7ea470cedd64472eb233 
1//===-- source/Host/linux/Host.cpp ------------------------------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10// C Includes
11#include <stdio.h>
12#include <sys/utsname.h>
13#include <sys/types.h>
14#include <sys/stat.h>
15#include <fcntl.h>
16
17
18// C++ Includes
19// Other libraries and framework includes
20// Project includes
21#include "lldb/Core/Error.h"
22#include "lldb/Target/Process.h"
23
24#include "lldb/Host/Host.h"
25#include "lldb/Core/DataBufferHeap.h"
26#include "lldb/Core/DataExtractor.h"
27
28using namespace lldb;
29using namespace lldb_private;
30
31bool
32Host::GetOSVersion(uint32_t &major,
33                   uint32_t &minor,
34                   uint32_t &update)
35{
36    struct utsname un;
37    int status;
38
39    if (uname(&un))
40        return false;
41
42    status = sscanf(un.release, "%u.%u.%u", &major, &minor, &update);
43     return status == 3;
44}
45
46Error
47Host::LaunchProcess (ProcessLaunchInfo &launch_info)
48{
49    Error error;
50    assert(!"Not implemented yet!!!");
51    return error;
52}
53
54lldb::DataBufferSP
55Host::GetAuxvData(lldb_private::Process *process)
56{
57    static const size_t path_size = 128;
58    static char path[path_size];
59    lldb::DataBufferSP buf_sp;
60
61    int fd;
62
63    // Ideally, we would simply create a FileSpec and call ReadFileContents.
64    // However, files in procfs have zero size (since they are, in general,
65    // dynamically generated by the kernel) which is incompatible with the
66    // current ReadFileContents implementation.  Therefore we simply stream the
67    // data into a DataBuffer ourselves.
68    if (snprintf(path, path_size, "/proc/%d/auxv", process->GetID()) < 0)
69        return buf_sp;
70
71    if ((fd = open(path, O_RDONLY, 0)) < 0)
72        return buf_sp;
73
74    size_t bytes_read = 0;
75    std::auto_ptr<DataBufferHeap> buf_ap(new DataBufferHeap(1024, 0));
76    for (;;)
77    {
78        size_t avail = buf_ap->GetByteSize() - bytes_read;
79        ssize_t status = read(fd, buf_ap->GetBytes() + bytes_read, avail);
80
81        if (status < 0)
82            break;
83
84        bytes_read += status;
85
86        if (status == 0)
87        {
88            buf_ap->SetByteSize(bytes_read);
89            buf_sp.reset(buf_ap.release());
90            break;
91        }
92
93        if (avail - status == 0)
94            buf_ap->SetByteSize(2 * buf_ap->GetByteSize());
95    }
96
97    return buf_sp;
98}
99