bf9a77305f
This moves the following classes from Core -> Utility. ConstString Error RegularExpression Stream StreamString The goal here is to get lldbUtility into a state where it has no dependendencies except on itself and LLVM, so it can be the starting point at which to start untangling LLDB's dependencies. These are all low level and very widely used classes, and previously lldbUtility had dependencies up to lldbCore in order to use these classes. So moving then down to lldbUtility makes sense from both the short term and long term perspective in solving this problem. Differential Revision: https://reviews.llvm.org/D29427 llvm-svn: 293941
104 lines
3.0 KiB
C++
104 lines
3.0 KiB
C++
//===-- ProcFileReader.cpp --------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "Plugins/Process/Linux/ProcFileReader.h"
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// C Headers
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#include <fcntl.h>
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#include <inttypes.h>
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#include <limits.h>
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#include <stdio.h>
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#include <sys/stat.h>
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// C++ Headers
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#include <fstream>
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// LLDB Headers
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#include "lldb/Core/DataBufferHeap.h"
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#include "lldb/Utility/Error.h"
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using namespace lldb_private;
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using namespace lldb_private::process_linux;
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lldb::DataBufferSP ProcFileReader::ReadIntoDataBuffer(lldb::pid_t pid,
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const char *name) {
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int fd;
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char path[PATH_MAX];
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// Make sure we've got a nil terminated buffer for all the folks calling
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// GetBytes() directly off our returned DataBufferSP if we hit an error.
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lldb::DataBufferSP buf_sp(new DataBufferHeap(1, 0));
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// Ideally, we would simply create a FileSpec and call ReadFileContents.
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// However, files in procfs have zero size (since they are, in general,
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// dynamically generated by the kernel) which is incompatible with the
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// current ReadFileContents implementation. Therefore we simply stream the
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// data into a DataBuffer ourselves.
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if (snprintf(path, PATH_MAX, "/proc/%" PRIu64 "/%s", pid, name) > 0) {
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if ((fd = open(path, O_RDONLY, 0)) >= 0) {
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size_t bytes_read = 0;
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std::unique_ptr<DataBufferHeap> buf_ap(new DataBufferHeap(1024, 0));
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for (;;) {
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size_t avail = buf_ap->GetByteSize() - bytes_read;
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ssize_t status = read(fd, buf_ap->GetBytes() + bytes_read, avail);
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if (status < 0)
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break;
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if (status == 0) {
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buf_ap->SetByteSize(bytes_read);
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buf_sp.reset(buf_ap.release());
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break;
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}
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bytes_read += status;
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if (avail - status == 0)
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buf_ap->SetByteSize(2 * buf_ap->GetByteSize());
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}
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close(fd);
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}
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}
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return buf_sp;
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}
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Error ProcFileReader::ProcessLineByLine(
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lldb::pid_t pid, const char *name,
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std::function<bool(const std::string &line)> line_parser) {
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Error error;
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// Try to open the /proc/{pid}/maps entry.
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char filename[PATH_MAX];
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snprintf(filename, sizeof(filename), "/proc/%" PRIu64 "/%s", pid, name);
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filename[sizeof(filename) - 1] = '\0';
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std::ifstream proc_file(filename);
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if (proc_file.fail()) {
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error.SetErrorStringWithFormat("failed to open file '%s'", filename);
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return error;
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}
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// Read the file line by line, processing until either end of file or when the
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// line_parser returns false.
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std::string line;
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bool should_continue = true;
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while (should_continue && std::getline(proc_file, line)) {
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// Pass the line over to the line_parser for processing. If the line_parser
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// returns false, we
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// stop processing.
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should_continue = line_parser(line);
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}
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return error;
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}
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