1 /* Copyright (c) 2008-2015. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
11 #include <sys/types.h>
13 # include <sys/mman.h>
16 #include <xbt/sysdep.h>
21 #include "memory_map.hpp"
24 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_memory_map, xbt, "Logging specific to algorithms for memory_map");
31 * \todo This function contains many cases that do not allow for a
32 * recovery. Currently, xbt_abort() is called but we should
33 * much rather die with the specific reason so that it's easier
34 * to find out what's going on.
36 XBT_PRIVATE std::vector<VmMap> get_memory_map(pid_t pid)
39 /* Open the actual process's proc maps file and create the memory_map_t */
41 char* path = bprintf("/proc/%i/maps", (int) pid);
42 FILE *fp = std::fopen(path, "r");
44 std::perror("fopen failed");
45 xbt_die("Cannot open %s to investigate the memory map of the process.", path);
50 std::vector<VmMap> ret;
52 /* Read one line at the time, parse it and add it to the memory map to be returned */
53 ssize_t read; /* Number of bytes readed */
55 std::size_t n = 0; /* Amount of bytes to read by xbt_getline */
56 while ((read = xbt_getline(&line, &n, fp)) != -1) {
58 * The lines that we read have this format: (This is just an example)
59 * 00602000-00603000 rw-p 00002000 00:28 1837264 <complete-path-to-file>
62 //fprintf(stderr,"%s", line);
64 /* Wipeout the new line character */
65 line[read - 1] = '\0';
67 /* Tokenize the line using spaces as delimiters and store each token in lfields array. We expect 5 tokens for 6 fields */
69 lfields[0] = strtok(line, " ");
72 for (i = 1; i < 6 && lfields[i - 1] != nullptr; i++) {
73 lfields[i] = std::strtok(nullptr, " ");
76 /* Check to see if we got the expected amount of columns */
78 xbt_die("The memory map apparently only supplied less than 6 columns. Recovery impossible.");
80 /* Ok we are good enough to try to get the info we need */
81 /* First get the start and the end address of the map */
82 char *tok = std::strtok(lfields[0], "-");
84 xbt_die("Start and end address of the map are not concatenated by a hyphen (-). Recovery impossible.");
88 memreg.start_addr = std::strtoull(tok, &endptr, 16);
89 /* Make sure that the entire string was an hex number */
93 tok = std::strtok(nullptr, "-");
97 memreg.end_addr = std::strtoull(tok, &endptr, 16);
98 /* Make sure that the entire string was an hex number */
102 /* Get the permissions flags */
103 if (std::strlen(lfields[1]) < 4)
108 for (i = 0; i < 3; i++){
109 switch(lfields[1][i]){
111 memreg.prot |= PROT_READ;
114 memreg.prot |= PROT_WRITE;
117 memreg.prot |= PROT_EXEC;
123 if (memreg.prot == 0)
124 memreg.prot |= PROT_NONE;
126 if (lfields[1][3] == 'p')
127 memreg.flags |= MAP_PRIVATE;
128 else if (lfields[1][3] == 's')
129 memreg.flags |= MAP_SHARED;
131 xbt_die("Flag was neither 'p' (private) nor 's' (shared). This should have never happened! Instead, the permissions column was set to: %s\n"
132 "This was the whole line that caused the trouble: %s", lfields[1], line);
135 /* Get the offset value */
136 memreg.offset = std::strtoull(lfields[2], &endptr, 16);
137 /* Make sure that the entire string was an hex number */
141 /* Get the device major:minor bytes */
142 tok = std::strtok(lfields[3], ":");
146 memreg.dev_major = (char) strtoul(tok, &endptr, 16);
147 /* Make sure that the entire string was an hex number */
151 tok = std::strtok(nullptr, ":");
155 memreg.dev_minor = (char) std::strtoul(tok, &endptr, 16);
156 /* Make sure that the entire string was an hex number */
160 /* Get the inode number and make sure that the entire string was a long int */
161 memreg.inode = strtoul(lfields[4], &endptr, 10);
165 /* And finally get the pathname */
167 memreg.pathname = lfields[5];
169 /* Create space for a new map region in the region's array and copy the */
170 /* parsed stuff from the temporal memreg variable */
171 XBT_DEBUG("Found region for %s", !memreg.pathname.empty() ? memreg.pathname.c_str() : "(null)");
173 ret.push_back(std::move(memreg));
180 /* On FreeBSD, kinfo_getvmmap() could be used but mmap() support is disabled anyway. */
181 xbt_die("Could not get memory map from process %lli", (long long int) pid);