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");
30 XBT_PRIVATE std::vector<VmMap> get_memory_map(pid_t pid)
33 /* Open the actual process's proc maps file and create the memory_map_t */
35 char* path = bprintf("/proc/%i/maps", (int) pid);
36 FILE *fp = std::fopen(path, "r");
38 std::perror("fopen failed");
39 xbt_die("Cannot open %s to investigate the memory map of the process.", path);
44 std::vector<VmMap> ret;
46 /* Read one line at the time, parse it and add it to the memory map to be returned */
47 ssize_t read; /* Number of bytes readed */
49 std::size_t n = 0; /* Amount of bytes to read by xbt_getline */
50 while ((read = xbt_getline(&line, &n, fp)) != -1) {
52 //fprintf(stderr,"%s", line);
54 /* Wipeout the new line character */
55 line[read - 1] = '\0';
57 /* Tokenize the line using spaces as delimiters and store each token in lfields array. We expect 5 tokens/fields */
59 lfields[0] = strtok(line, " ");
62 for (i = 1; i < 6 && lfields[i - 1] != nullptr; i++) {
63 lfields[i] = std::strtok(nullptr, " ");
66 /* Check to see if we got the expected amount of columns */
68 xbt_die("The memory map apparently only supplied less than 6 columns. Recovery impossible.");
70 /* Ok we are good enough to try to get the info we need */
71 /* First get the start and the end address of the map */
72 char *tok = std::strtok(lfields[0], "-");
74 xbt_die("Start and end address of the map are not concatenated by a hyphen (-). Recovery impossible.");
78 memreg.start_addr = std::strtoull(tok, &endptr, 16);
79 /* Make sure that the entire string was an hex number */
83 tok = std::strtok(nullptr, "-");
87 memreg.end_addr = std::strtoull(tok, &endptr, 16);
88 /* Make sure that the entire string was an hex number */
92 /* Get the permissions flags */
93 if (std::strlen(lfields[1]) < 4)
98 for (i = 0; i < 3; i++){
99 switch(lfields[1][i]){
101 memreg.prot |= PROT_READ;
104 memreg.prot |= PROT_WRITE;
107 memreg.prot |= PROT_EXEC;
113 if (memreg.prot == 0)
114 memreg.prot |= PROT_NONE;
116 if (lfields[1][4] == 'p')
117 memreg.flags |= MAP_PRIVATE;
118 else if (lfields[1][4] == 's')
119 memreg.flags |= MAP_SHARED;
121 /* Get the offset value */
122 memreg.offset = std::strtoull(lfields[2], &endptr, 16);
123 /* Make sure that the entire string was an hex number */
127 /* Get the device major:minor bytes */
128 tok = std::strtok(lfields[3], ":");
132 memreg.dev_major = (char) strtoul(tok, &endptr, 16);
133 /* Make sure that the entire string was an hex number */
137 tok = std::strtok(nullptr, ":");
141 memreg.dev_minor = (char) std::strtoul(tok, &endptr, 16);
142 /* Make sure that the entire string was an hex number */
146 /* Get the inode number and make sure that the entire string was a long int */
147 memreg.inode = strtoul(lfields[4], &endptr, 10);
151 /* And finally get the pathname */
153 memreg.pathname = lfields[5];
155 /* Create space for a new map region in the region's array and copy the */
156 /* parsed stuff from the temporal memreg variable */
157 XBT_DEBUG("Found region for %s", !memreg.pathname.empty() ? memreg.pathname.c_str() : "(null)");
159 ret.push_back(std::move(memreg));
166 /* On FreeBSD, kinfo_getvmmap() could be used but mmap() support is disabled anyway. */
167 xbt_die("Could not get memory map from process %lli", (long long int) pid);