+/*
+ * Copyright (c) 2016 Samsung Electronics Co., Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the License);
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Authors: Adrian Szyndela <adrian.s@samsung.com>
+ * Łukasz Stelmach <l.stelmach@samsung.com>
+ * Rafał Pietruch <r.pietruch@samsung.com>
+ */
+#define _GNU_SOURCE 1
+
+/**
+ * @file crash-stack.c
+ * @brief This file contains Main module of call stack unwinding program
+ *
+ * Crash-stack is a single purpose program. Its duty is to show call stack
+ * of a crashed program. Crash-stack must be called with proper arguments:
+ * PID of a crashed program.
+ */
+#include "crash-stack.h"
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <getopt.h>
+#include <libelf.h>
+#include <linux/prctl.h>
+#include <stdio.h>
#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/prctl.h>
+#include <sys/ptrace.h>
+#include <sys/stat.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
+#include <sys/uio.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#include <elfutils/version.h>
+#include <elfutils/libdwfl.h>
+
+#define BUF_SIZE (BUFSIZ)
+#define HEXA 16
+#define PERM_LEN 5
+#define ADDR_LEN 16
+#define STR_ANONY "[anony]"
+#define STR_ANONY_LEN 8
+
+static FILE *outputfile = NULL; ///< global output stream
+static FILE *errfile = NULL; ///< global error stream
+static FILE *bufferfile = NULL; ///< buffer file for ordering
+
+/**
+ * @brief definitions for getopt options: identifiers
+ */
+enum {
+ OPT_PID,
+ OPT_TID,
+ OPT_SIGNUM,
+ OPT_OUTPUTFILE,
+ OPT_ERRFILE
+};
+
+/**
+ * @brief definitions for getopt options: full specifications
+ */
+const struct option opts[] = {
+ { "pid", required_argument, 0, OPT_PID },
+ { "tid", required_argument, 0, OPT_TID },
+ { "sig", required_argument, 0, OPT_SIGNUM },
+ { "output", required_argument, 0, OPT_OUTPUTFILE },
+ { "erroutput", required_argument, 0, OPT_ERRFILE },
+ { 0, 0, 0, 0 }
+};
+
+/**
+ * @brief container for information from /proc/PID/maps
+ */
+struct addr_node {
+ uintptr_t startaddr;
+ uintptr_t endaddr;
+ char perm[PERM_LEN];
+ char *fpath;
+ struct addr_node *next;
+};
+
+/* helper functions for reading /proc/PID/maps */
+static struct addr_node *get_addr_list_from_maps(int fd);
+static void free_all_nodes(struct addr_node *start);
+static char *fgets_fd(char *str, int len, int fd);
+
+/*
+ * __cxa_demangle() is taken from libstdc++, however there is no header that we
+ * can take a declaration from. Importing through 'extern' allows using it.
+ */
+/// @cond false
+extern char *__cxa_demangle(const char *mangled_name, char *output_buffer,
+ size_t *length, int *status);
+///@endcond
+
+/**
+ * @brief A callback for dwfl_getmodules().
+ *
+ * This callback is called once for every module discovered by dwfl_getmodules().
+ *
+ * @param module the dwfl module
+ * @param userdata unused, required by dwfl_getmodules()
+ * @param name name of the module
+ * @param address address of the module
+ * @param arg 4th argument to dwfl_getmodules is passed here
+ */
+static int __module_callback(Dwfl_Module *module, void **userdata,
+ const char *name, Dwarf_Addr address,
+ void *arg)
+{
+ return DWARF_CB_OK;
+}
+
+static void __find_symbol_in_elf(ProcInfo *proc_info, Dwarf_Addr mapping_start)
+{
+ Elf *elf;
+ int fd;
+ const char *elf_name = proc_info->module_name;
+ Dwarf_Addr address = proc_info->addr;
+
+ fd = open(elf_name, O_RDONLY);
+ if (-1 == fd)
+ return;
+
+ elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
+
+ if (NULL == elf) {
+ close(fd);
+ return;
+ }
+
+ Elf_Scn *scn = NULL;
+ int found = 0;
+
+ while ((scn = elf_nextscn(elf, scn)) != NULL && !found) {
+ GElf_Shdr shdr_mem;
+ GElf_Shdr *shdr = gelf_getshdr(scn, &shdr_mem);
+ if (shdr != NULL && (shdr->sh_type == SHT_SYMTAB || shdr->sh_type == SHT_DYNSYM)) {
+ Elf_Data *sdata = elf_getdata(scn, NULL);
+ unsigned int nsyms = sdata->d_size / (gelf_getclass(elf) == ELFCLASS32 ?
+ sizeof(Elf32_Sym) :
+ sizeof(Elf64_Sym));
+ unsigned int cnt;
+ uintptr_t address_offset = address;
+ if (shdr->sh_type == SHT_DYNSYM)
+ address_offset -= mapping_start;
+ for (cnt = 0; cnt < nsyms; ++cnt) {
+ GElf_Sym sym_mem;
+ Elf32_Word xndx;
+ GElf_Sym *sym = gelf_getsymshndx(sdata, NULL, cnt, &sym_mem, &xndx);
+ if (sym != NULL && sym->st_shndx != SHN_UNDEF) {
+ if (sym->st_value <= address_offset && address_offset < sym->st_value + sym->st_size) {
+ free(proc_info->name);
+ proc_info->name = strdup(elf_strptr(elf, shdr->sh_link, sym->st_name));
+ proc_info->offset = address_offset - sym->st_value;
+ found = 1;
+ break;
+ }
+ }
+ }
+ }
+ }
+
+ elf_end(elf);
+ close(fd);
+}
+
+static int __attachable(pid_t pid, pid_t tid)
+{
+ /* read /proc/<pid>/stat */
+ char buf[40];
+ FILE *f;
+ char status;
+
+ snprintf(buf, sizeof(buf), "/proc/%d/task/%d/stat", pid, tid);
+
+ f = fopen(buf, "r");
+ if (NULL == f)
+ return -1;
+
+ /* check if status is D */
+ if (fscanf(f, "%*d %*s %c", &status) != 1) {
+ fclose(f);
+ return -1;
+ }
+
+ fclose(f);
+
+ return status != 'D';
+}
+
+static void __print_proc_file(pid_t pid, pid_t tid, const char *name)
+{
+ char buf[1024];
+ FILE *f;
+ int r;
+
+ snprintf(buf, sizeof(buf), "/proc/%d/task/%d/%s", pid, tid, name);
+
+ fprintf(outputfile, "%s:\n", buf);
+
+ f = fopen(buf, "r");
+ if (NULL == f)
+ {
+ fprintf(errfile, "Failed to open %s: %m\n", buf);
+ return;
+ }
+
+ while ((r = fread(buf, 1, sizeof(buf), f)) > 0)
+ {
+ fwrite(buf, r, 1, outputfile);
+ }
+
+ fclose(f);
+
+ fprintf(outputfile, "\n");
+}
+
+static void __print_not_attachable_process_info(pid_t pid, pid_t tid)
+{
+ fprintf(outputfile, "ERROR: can't attach to process %d, thread %d - thread is in uninterruptible sleep state\n", pid, tid);
+ fprintf(outputfile, "Giving some /proc info instead:\n\n");
+ __print_proc_file(pid, tid, "wchan");
+ fprintf(outputfile, "\n");
+ __print_proc_file(pid, tid, "syscall");
+ __print_proc_file(pid, tid, "stack");
+}
+
+/**
+ * @brief Opens libdwfl for using with live process
+ *
+ * @param pid pid of the process to attach to
+ * @return Dwfl handle
+ */
+static Dwfl *__open_dwfl_with_pid(pid_t pid, pid_t tid)
+{
+ int status;
+ pid_t stopped_pid;
+
+ status = __attachable(pid, tid);
+ if (-1 == status)
+ {
+ fprintf(errfile, "failed to read /proc/%d/task/%d/stat: %m\n", pid, tid);
+ return NULL;
+ }
+ if (!status)
+ {
+ __print_not_attachable_process_info(pid, tid);
+ return NULL;
+ }
+
+ if (ptrace(PTRACE_SEIZE, tid, NULL, PTRACE_O_TRACEEXIT) != 0) {
+ fprintf(errfile, "PTRACE_SEIZE failed on TID %d: %m\n", tid);
+ return NULL;
+ }
+
+ ptrace(PTRACE_INTERRUPT, tid, 0, 0);
+
+ stopped_pid = waitpid(tid, &status, __WALL);
+ if (stopped_pid == -1 || stopped_pid != tid || !WIFSTOPPED(status)) {
+ fprintf(errfile, "waitpid failed: %m, stopped_pid=%d, status=%d\n", stopped_pid, status);
+ return NULL;
+ }
+
+ static const Dwfl_Callbacks proc_callbacks = {
+ .find_elf = dwfl_linux_proc_find_elf,
+ .find_debuginfo = dwfl_standard_find_debuginfo,
+ .section_address = NULL,
+ .debuginfo_path = NULL
+ };
+
+ Dwfl *dwfl = dwfl_begin(&proc_callbacks);
+ if (dwfl == NULL) {
+ fprintf(errfile, "process %d : Can't start dwfl (%s)\n", tid, dwfl_errmsg(-1));
+ return NULL;
+ }
+
+ if (dwfl_linux_proc_report(dwfl, tid) < 0) {
+ fprintf(errfile, "process %d : dwfl report failed (%s)\n", tid, dwfl_errmsg(-1));
+ dwfl_end(dwfl);
+ return NULL;
+ }
+
+#if _ELFUTILS_PREREQ(0,158)
+ if (dwfl_linux_proc_attach(dwfl, tid, true) < 0) {
+ fprintf(errfile, "process %d : dwfl attach failed (%s)\n", tid, dwfl_errmsg(-1));
+ dwfl_end(dwfl);
+ return NULL;
+ }
+#endif
+ return dwfl;
+}
+
+/**
+ * @brief Gets registers information for live process
+ *
+ * @param pid pid of the live process
+ * @return 0 on success, -1 otherwise
+ */
+static int __get_registers_ptrace(pid_t pid)
+{
+ struct iovec data;
+ data.iov_base = _crash_stack_get_memory_for_ptrace_registers(&data.iov_len);
+
+ if (NULL == data.iov_base) {
+ fprintf(errfile, "Cannot get memory for registers for ptrace (not implemented for this architecture\n");
+ return -1;
+ }
+
+ if (ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &data) != 0) {
+ fprintf(errfile, "PTRACE_GETREGSET failed on PID %d: %m\n", pid);
+ return -1;
+ }
+
+ _crash_stack_set_ptrace_registers(data.iov_base);
+
+ return 0;
+}
+
+/**
+ * @brief Print signal number causing dump
+ */
+static void __crash_stack_print_signal(int signo)
+{
+ const char* const signal_table[] = {
+ [SIGHUP]="SIGHUP", [SIGINT]="SIGINT", [SIGQUIT]="SIGQUIT",
+ [SIGILL]="SIGILL", [SIGTRAP]="SIGTRAP", [SIGABRT]="SIGABRT",
+ /* [SIGIOT]="SIGIOT", */ [SIGBUS]="SIGBUS", [SIGFPE]="SIGFPE",
+ [SIGKILL]="SIGKILL", [SIGUSR1]="SIGUSR1", [SIGSEGV]="SIGSEGV",
+ [SIGUSR2]="SIGUSR2", [SIGPIPE]="SIGPIPE", [SIGALRM]="SIGALRM",
+ [SIGTERM]="SIGTERM", [SIGSTKFLT]="SIGSTKFLT", [SIGCHLD]="SIGCHLD",
+ [SIGCONT]="SIGCONT", [SIGSTOP]="SIGSTOP", [SIGTSTP]="SIGTSTP",
+ [SIGTTIN]="SIGTTIN", [SIGTTOU]="SIGTTOU", [SIGURG]="SIGURG",
+ [SIGXCPU]="SIGXCPU", [SIGXFSZ]="SIGXFSZ", [SIGVTALRM]="SIGVTALRM",
+ [SIGPROF]="SIGPROF", [SIGWINCH]="SIGWINCH", [SIGIO]="SIGIO",
+ [SIGPWR]="SIGPWR", [SIGSYS]="SIGSYS", /* [SIGUNUSED]="SIGUNUSED", */
+ };
+
+ if (SIGHUP > signo || signo > SIGSYS) {
+ fprintf(errfile, "Invalid signal number: %d\n", signo);
+ return;
+ }
+
+ printf("Signal: %d\n"
+ " (%s)\n",
+ signo,
+ signal_table[signo]);
+}
+
+/**
+ * @brief Resolves procedure and module names using libdwfl
+ *
+ * @param proc_info gathered call stack element
+ * @param dwfl dwfl handler
+ */
+static void __resolve_symbols_from_dwfl(ProcInfo *proc_info, Dwfl *dwfl)
+{
+ uintptr_t address = proc_info->addr;
+ Dwfl_Module *module = dwfl_addrmodule(dwfl, address);
+ if (module) {
+
+ Dwarf_Addr mapping_start = 0;
+ const char *fname = 0;
+ const char *module_name = dwfl_module_info(module, NULL, &mapping_start, NULL, NULL, NULL, &fname, NULL);
+
+ proc_info->module_offset = address - mapping_start;
+
+ if (!proc_info->module_name) {
+ if (fname)
+ proc_info->module_name = strdup(fname);
+ else if (module_name)
+ proc_info->module_name = strdup(module_name);
+ }
+
+ const char *symbol = dwfl_module_addrname(module, address);
+ if (symbol) {
+ free(proc_info->name);
+ proc_info->name = strdup(symbol);
+ }
+ else if (proc_info->module_name != NULL) {
+ __find_symbol_in_elf(proc_info, mapping_start);
+ }
+ }
+}
+
+/**
+ * @brief Checks if symbol starts with '_Z' prefix
+ *
+ * @param symbol string to compare
+ */
+static int is_symbol_demanglable(const char *symbol)
+{
+ return symbol != 0 && (strlen(symbol) >= 2) &&
+ symbol[0] == '_' && symbol[1] == 'Z';
+}
+
+/**
+ * @brief Replaces symbols with demangled
+ *
+ * @param proc_info gathered call stack element
+ */
+static void __demangle_symbols(ProcInfo *proc_info)
+{
+ int status = -1;
+ char *dem_buffer = NULL;
+ char *demangled_symbol = __cxa_demangle(proc_info->name, dem_buffer, NULL, &status);
+ if (status == 0) {
+ free(proc_info->name);
+ proc_info->name = demangled_symbol;
+ }
+}
+
+/**
+ * @brief Resolves procedure and module name
+ *
+ * @param proc_info gathered call stack element
+ * @param dwfl dwfl handler
+ * @param notes notes handler, NULL if live process analyzed
+ */
+static void __resolve_symbols(ProcInfo *proc_info, Dwfl *dwfl)
+{
+ __resolve_symbols_from_dwfl(proc_info, dwfl);
+
+ if (is_symbol_demanglable(proc_info->name))
+ __demangle_symbols(proc_info);
+}
+
+/**
+ * @brief Prints call stack element to the global outputfile.
+ *
+ * @param proc_info gathered call stack element
+ */
+static void __print_proc_info(ProcInfo *proc_info)
+{
+ if (proc_info->name) {
+ fprintf(outputfile, "%s ", proc_info->name);
+ if (proc_info->offset >= 0)
+ fprintf(outputfile, "+ 0x%x ", proc_info->offset);
+ }
+ if (sizeof(proc_info->addr) > 4)
+ fprintf(outputfile, "(0x%016llx)", (long long)proc_info->addr);
+ else
+ fprintf(outputfile, "(0x%08x)", (int32_t)proc_info->addr);
+
+ if (proc_info->module_name != 0)
+ fprintf(outputfile, " [%s] + 0x%x", proc_info->module_name, proc_info->module_offset);
+
+ fprintf(outputfile, "\n");
+}
+
+/**
+ * @brief Prints call stack to the global outputfile.
+ *
+ * @param callstack gathered call stack database
+ * @param pid PID of the live process
+ */
+static void __print_callstack(Callstack *callstack, pid_t pid)
+{
+ fprintf(outputfile, "\nCallstack Information");
+ fprintf(outputfile, " (PID:%d)", pid);
+ fprintf(outputfile, "\nCall Stack Count: %zu\n", callstack->elems);
+
+ size_t it;
+ for (it = 0; it != callstack->elems; ++it) {
+ fprintf(outputfile, "%2zu: ", it);
+ __print_proc_info(&callstack->proc[it]);
+ }
+ fprintf(outputfile, "End of Call Stack\n");
+}
+
+void callstack_constructor(Callstack *callstack)
+{
+ size_t it;
+ callstack->elems = 0;
+ for (it = 0; it < (int)sizeof(callstack->proc)/sizeof(callstack->proc[0]); ++it) {
+ callstack->proc[it].offset = -1;
+ callstack->proc[it].name = 0;
+ callstack->proc[it].module_name = 0;
+ }
+}
+
+void callstack_destructor(Callstack *callstack)
+{
+ size_t it;
+ for (it = 0; it < callstack->elems; ++it) {
+ free(callstack->proc[it].name);
+ free(callstack->proc[it].module_name);
+ }
+}
+
+/**
+ * @brief Print full path of executable file
+ */
+static void __crash_stack_print_exe(FILE* outputfile, pid_t pid)
+{
+ int fd, ret;
+ char file_path[PATH_MAX];
+ char cmd_path[PATH_MAX];
+
+ snprintf(cmd_path, PATH_MAX, "/proc/%d/cmdline", pid);
+ if ((fd = open(cmd_path, O_RDONLY)) < 0)
+ return;
+
+ if ((ret = read(fd, file_path, sizeof(file_path))) <= 0) {
+ close(fd);
+ return;
+ }
+ file_path[ret] = '\0';
+
+ fprintf(outputfile, "Executable File Path: %s\n", file_path);
+ close(fd);
+}
+
+/**
+ * @brief Print thread information
+ *
+ * @param outputfile File handle for printing report
+ * @param pid PID of the inspected process
+ * @param tid TID of the inspected thread
+ */
+static void __crash_stack_print_threads(FILE* outputfile, pid_t pid, pid_t tid)
+{
+ int threadnum=1;
+ DIR *dir;
+ struct dirent entry;
+ struct dirent *dentry=NULL;
+ char task_path[PATH_MAX];
+ struct stat sb;
+
+
+ snprintf(task_path, PATH_MAX, "/proc/%d/task", pid);
+ if (stat(task_path, &sb) == -1) {
+ return;
+ }
+
+ threadnum = sb.st_nlink - 2;
+
+ if (threadnum > 1) {
+ fprintf(outputfile, "\nThreads Information\n");
+ fprintf(outputfile,
+ "Threads: %d\nPID = %d TID = %d\n",
+ threadnum, pid, tid);
+ /* print thread */
+ dir = opendir(task_path);
+ if (!dir) {
+ fprintf(errfile, "[crash-stack] cannot open %s\n", task_path);
+ } else {
+ while (readdir_r(dir, &entry, &dentry) == 0 && dentry) {
+ if (strcmp(dentry->d_name, ".") == 0 ||
+ strcmp(dentry->d_name, "..") == 0)
+ continue;
+ fprintf(outputfile, "%s ", dentry->d_name);
+ }
+ closedir(dir);
+ fprintf(outputfile, "\n");
+ }
+ }
+
+}
+
+/**
+ * @brief Print information about mapped memory regions
+ *
+ * @param outputfile File handle for printing report.
+ * @param pid PID of the inspected process
+ */
+static void __crash_stack_print_maps(FILE* outputfile, pid_t pid)
+{
+ char file_path[PATH_MAX];
+ struct addr_node *head = NULL;
+ struct addr_node *t_node;
+ int fd;
+
+ snprintf(file_path, PATH_MAX, "/proc/%d/maps", pid);
+
+ if ((fd = open(file_path, O_RDONLY)) < 0) {
+ fprintf(errfile, "[crash-stack] cannot open %s\n", file_path);
+ } else {
+ /* parsing the maps to get code segment address*/
+ head = get_addr_list_from_maps(fd);
+ close(fd);
+ }
+ if (head == NULL) {
+ return;
+ }
+
+ t_node = head;
+ fprintf(outputfile, "\nMaps Information\n");
+ while (t_node) {
+ if (!strncmp(STR_ANONY, t_node->fpath, STR_ANONY_LEN)) {
+ t_node = t_node->next;
+ } else {
+ fprintf(outputfile, "%16lx %16lx %s %s\n",
+ (unsigned long)t_node->startaddr,
+ (unsigned long)t_node->endaddr,
+ t_node->perm, t_node->fpath);
+ t_node = t_node->next;
+ }
+ }
+ fprintf(outputfile, "End of Maps Information\n");
+ free_all_nodes(head);
+}
+
+static struct addr_node *get_addr_list_from_maps(int fd)
+{
+ int fpath_len, result;
+ uintptr_t saddr;
+ uintptr_t eaddr;
+ char perm[PERM_LEN];
+ char path[PATH_MAX];
+ char addr[ADDR_LEN * 2 + 2];
+ char linebuf[BUF_SIZE];
+ struct addr_node *head = NULL;
+ struct addr_node *tail = NULL;
+ struct addr_node *t_node = NULL;
+
+ /* parsing the maps to get executable code address */
+ while (fgets_fd(linebuf, BUF_SIZE, fd) != NULL) {
+ memset(path, 0, PATH_MAX);
+ result = sscanf(linebuf, "%s %s %*s %*s %*s %s ", addr, perm, path);
+ if (result < 0)
+ continue;
+ perm[PERM_LEN - 1] = 0;
+ /* rwxp */
+ if ((perm[2] == 'x' && path[0] == '/') ||
+ (perm[1] == 'w' && path[0] != '/'))
+ {
+ char* addr2 = strchr(addr, '-');
+ *(addr2++) = '\0';
+ /* add addr node to list */
+ saddr = strtoul(addr, NULL, HEXA);
+ /* ffff0000-ffff1000 */
+ eaddr = strtoul(addr2, NULL, HEXA);
+ /* make node and attach to the list */
+ t_node = (struct addr_node *)mmap(0, sizeof(struct addr_node),
+ PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ if (t_node == NULL) {
+ fprintf(errfile, "error : mmap\n");
+ return NULL;
+ }
+ memcpy(t_node->perm, perm, PERM_LEN);
+ t_node->startaddr = saddr;
+ t_node->endaddr = eaddr;
+ t_node->fpath = NULL;
+ fpath_len = strlen(path);
+ if (fpath_len > 0) {
+ t_node->fpath = (char *)mmap(0, fpath_len + 1,
+ PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ memset(t_node->fpath, 0, fpath_len + 1);
+ memcpy(t_node->fpath, path, fpath_len);
+ } else {
+ t_node->fpath = (char *)mmap(0, STR_ANONY_LEN,
+ PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ memset(t_node->fpath, 0, STR_ANONY_LEN);
+ memcpy(t_node->fpath, STR_ANONY, STR_ANONY_LEN);
+ }
+ t_node->next = NULL;
+ if (head == NULL) {
+ head = t_node;
+ tail = t_node;
+ } else {
+ tail->next = t_node;
+ tail = t_node;
+ }
+ }
+ }
+ return head;
+}
+
+static void free_all_nodes(struct addr_node *start)
+{
+ struct addr_node *t_node, *n_node;
+ int fpath_len;
+
+ if (start == NULL)
+ return;
+ t_node = start;
+ n_node = t_node->next;
+ while (t_node) {
+ if (t_node->fpath != NULL) {
+ fpath_len = strlen(t_node->fpath);
+ munmap(t_node->fpath, fpath_len + 1);
+ }
+ munmap(t_node, sizeof(struct addr_node));
+ if (n_node == NULL)
+ break;
+ t_node = n_node;
+ n_node = n_node->next;
+ }
+}
+
+static char *fgets_fd(char *str, int len, int fd)
+{
+ char ch;
+ register char *cs;
+ int num = 0;
+
+ cs = str;
+ while (--len > 0 && (num = read(fd, &ch, 1) > 0)) {
+ if ((*cs++ = ch) == '\n')
+ break;
+ }
+ *cs = '\0';
+ return (num == 0 && cs == str) ? NULL : str;
+}
+
+/**
+ * @brief Print process and system memory information
+ *
+ * @param outputfile File handle for printing report.
+ * @param pid PID of the inspected process
+ */
+static void __crash_stack_print_meminfo(FILE* outputfile, pid_t pid)
+{
+ char infoname[BUF_SIZE];
+ char memsize[BUF_SIZE];
+ char linebuf[BUF_SIZE];
+ char file_path[PATH_MAX];
+ int fd;
+
+ fprintf(outputfile, "\nMemory information\n");
+
+ if ((fd = open("/proc/meminfo", O_RDONLY)) < 0) {
+ fprintf(errfile, "[crash-stack] cannot open /proc/meminfo\n");
+ } else {
+ while (fgets_fd(linebuf, BUF_SIZE, fd) != NULL) {
+ sscanf(linebuf, "%s %s %*s", infoname, memsize);
+ if (strcmp("MemTotal:", infoname) == 0) {
+ fprintf(outputfile, "%s %8s KB\n", infoname, memsize);
+ } else if (strcmp("MemFree:", infoname) == 0) {
+ fprintf(outputfile, "%s %8s KB\n", infoname, memsize);
+ } else if (strcmp("Buffers:", infoname) == 0) {
+ fprintf(outputfile, "%s %8s KB\n", infoname, memsize);
+ } else if (strcmp("Cached:", infoname) == 0) {
+ fprintf(outputfile, "%s %8s KB\n", infoname, memsize);
+ break;
+ }
+ }
+ close(fd);
+ }
+
+ snprintf(file_path, PATH_MAX, "/proc/%d/status", pid);
+ if ((fd = open(file_path, O_RDONLY)) < 0) {
+ fprintf(errfile, "[crash-stack] cannot open %s\n", file_path);
+ } else {
+ while (fgets_fd(linebuf, BUF_SIZE, fd) != NULL) {
+ sscanf(linebuf, "%s %s %*s", infoname, memsize);
+ if (strcmp("VmPeak:", infoname) == 0) {
+ fprintf(outputfile, "%s %8s KB\n", infoname,
+ memsize);
+ } else if (strcmp("VmSize:", infoname) == 0) {
+ fprintf(outputfile, "%s %8s KB\n", infoname,
+ memsize);
+ } else if (strcmp("VmLck:", infoname) == 0) {
+ fprintf(outputfile, "%s %8s KB\n", infoname,
+ memsize);
+ } else if (strcmp("VmPin:", infoname) == 0) {
+ fprintf(outputfile, "%s %8s KB\n", infoname,
+ memsize);
+ } else if (strcmp("VmHWM:", infoname) == 0) {
+ fprintf(outputfile, "%s %8s KB\n",
+ infoname, memsize);
+ } else if (strcmp("VmRSS:", infoname) == 0) {
+ fprintf(outputfile, "%s %8s KB\n",
+ infoname, memsize);
+ } else if (strcmp("VmData:", infoname) == 0) {
+ fprintf(outputfile, "%s %8s KB\n",
+ infoname, memsize);
+ } else if (strcmp("VmStk:", infoname) == 0) {
+ fprintf(outputfile, "%s %8s KB\n",
+ infoname, memsize);
+ } else if (strcmp("VmExe:", infoname) == 0) {
+ fprintf(outputfile, "%s %8s KB\n",
+ infoname, memsize);
+ } else if (strcmp("VmLib:", infoname) == 0) {
+ fprintf(outputfile, "%s %8s KB\n",
+ infoname, memsize);
+ } else if (strcmp("VmPTE:", infoname) == 0) {
+ fprintf(outputfile, "%s %8s KB\n",
+ infoname, memsize);
+ } else if (strcmp("VmSwap:", infoname) == 0) {
+ fprintf(outputfile, "%s %8s KB\n",
+ infoname, memsize);
+ break;
+ }
+ }
+ close(fd);
+ }
+}
+
+/**
+ * @brief Print information saved in buffer (bufferfile)
+ *
+ * @param bufferfile File handle for reading saved info.
+ * @param outputfile File handle for printing report.
+ */
+static void __print_buffer_info(FILE* bufferfile, FILE *outputfile)
+{
+ int cnt;
+ char buf[1024];
+
+ if (fseek(bufferfile, 0, SEEK_SET) < 0) {
+ fprintf(errfile, "Failed to fseek\n");
+ return;
+ }
+ while ((cnt = fread(buf, sizeof(char), sizeof(buf), bufferfile)) != 0) {
+ if (cnt != fwrite(buf, sizeof(char), cnt, outputfile))
+ break;
+ }
+}
+
+/**
+ * @brief Check wchan of thread
+ *
+ * @param pid PID of the inspected process
+ * @param tid TID of the thread to check
+ */
+static int check_thread_wchan(int pid, int tid)
+{
+ int fd, cnt;
+ char path[PATH_MAX], buf[100];
+
+ snprintf(path, PATH_MAX, "/proc/%d/task/%d/wchan", pid, tid);
+ fd = open(path, O_RDONLY);
+ if (fd == -1) {
+ fprintf(errfile, "[crash-stack] cannot open %s\n", path);
+ return -errno;
+ }
+ cnt = read(fd, buf, sizeof(buf));
+ if (cnt == -1 || cnt == sizeof(buf)) {
+ fprintf(errfile, "[crash-stack] read %s error\n", path);
+ close(fd);
+ return -errno;
+ }
+ buf[cnt] = 0;
+ close(fd);
+
+ if (strncmp("do_coredump", buf, sizeof(buf)) == 0)
+ return tid;
+ else
+ return 0;
+}
+
+/**
+ * @brief Find crashed tid if tid was not offered
+ *
+ * @param pid PID of the inspected process
+ */
+static int find_crash_tid(int pid)
+{
+ int threadnum = 1;
+ int crash_tid = -1;
+ DIR *dir;
+ struct dirent entry;
+ struct dirent *dentry = NULL;
+ char task_path[PATH_MAX];
+ struct stat sb;
+
+ snprintf(task_path, PATH_MAX, "/proc/%d/task", pid);
+ if (stat(task_path, &sb) == -1) {
+ return -1;
+ }
+
+ threadnum = sb.st_nlink - 2;
+
+ if (threadnum > 1) {
+ dir = opendir(task_path);
+ if (!dir) {
+ fprintf(errfile, "[crash-stack] cannot open %s\n", task_path);
+ return -1;
+ } else {
+ while (readdir_r(dir, &entry, &dentry) == 0 && dentry) {
+ if (strcmp(dentry->d_name, ".") == 0 ||
+ strcmp(dentry->d_name, "..") == 0)
+ continue;
+ crash_tid = check_thread_wchan(pid,
+ atoi(dentry->d_name));
+ if (crash_tid > 0)
+ break;
+ }
+ closedir(dir);
+ return crash_tid;
+ }
+ }
+ return -1;
+}
+
+/**
+ * @brief Main function.
+ *
+ * Main module accepts should be launched with:
+ *
+ * crash-stack --pid pid [--tid tid] [--sig sig]
+ *
+ * It allows connecting to a live process and displaying its call stack.
+ * It might be also used for connecting to a process from system's core dump handler.
+ */
int main(int argc, char **argv)
{
- return 0;
+ int c;
+ int signo = 0;
+ pid_t pid = 0;
+ pid_t tid = 0;
+ char bufferfile_path[20] = "/tmp/crash.XXXXXX";
+
+ prctl(PR_SET_DUMPABLE, 0);
+
+ while ((c = getopt_long_only(argc, argv, "", opts, NULL)) != -1) {
+ switch (c) {
+ case OPT_PID:
+ pid = atoi(optarg);
+ break;
+ case OPT_TID:
+ tid = atoi(optarg);
+ break;
+ case OPT_SIGNUM:
+ signo = atoi(optarg);
+ break;
+ case OPT_OUTPUTFILE:
+ outputfile = fopen(optarg, "w");
+ break;
+ case OPT_ERRFILE:
+ errfile = fopen(optarg, "w");
+ break;
+ }
+ }
+
+ if (NULL == errfile) errfile = stderr;
+ if (NULL == outputfile) outputfile = stdout;
+
+ if (tid == 0) {
+ if ((tid = find_crash_tid(pid)) < 0)
+ tid = pid;
+ }
+
+ if (mkstemp(bufferfile_path) < 0) {
+ fprintf(errfile, "Failed to create buffer file.\n");
+ return errno;
+ }
+ bufferfile = fopen(bufferfile_path, "w+");
+ unlink(bufferfile_path);
+
+ argc -= optind;
+
+ elf_version(EV_CURRENT);
+
+ /* First, prepare dwfl and modules */
+ Dwfl *dwfl = NULL;
+
+ /* Executable File Path */
+ __crash_stack_print_exe(outputfile, pid);
+
+ /* Signal information */
+ __crash_stack_print_signal(signo);
+
+ /*
+ * Pre-ptrace info
+ * Memory, thread, map info should be print in advance
+ * because some of them will be lost after ptrace analysis
+ */
+
+ /* Memory information */
+ __crash_stack_print_meminfo(bufferfile, pid);
+
+ /* Threads */
+ __crash_stack_print_threads(bufferfile, pid, tid);
+
+ /* Maps information */
+ __crash_stack_print_maps(bufferfile, pid);
+
+ if (pid > 1)
+ dwfl = __open_dwfl_with_pid(pid, tid);
+ else {
+ fprintf(errfile,
+ "Usage: %s [--output file] [--erroutput file] [--pid <pid> [--tid <tid>]]\n",
+ argv[0]);
+ return 1;
+ }
+
+ if (NULL == dwfl)
+ return 1111;
+
+ dwfl_getmodules(dwfl, __module_callback, NULL, 0);
+
+ if (-1 == __get_registers_ptrace(tid))
+ return 3333;
+
+ /* Unwind call stack */
+ Callstack callstack;
+ callstack_constructor(&callstack);
+
+ _create_crash_stack(dwfl, tid, &callstack);
+ size_t it;
+ for (it = 0; it != callstack.elems; ++it)
+ __resolve_symbols(&callstack.proc[it], dwfl);
+
+ /* Print registers */
+ _crash_stack_print_regs(outputfile);
+
+ /* Print pre-ptrace info */
+ __print_buffer_info(bufferfile, outputfile);
+
+ /* Print the results */
+ __print_callstack(&callstack, tid);
+
+ /* Clean up */
+ callstack_destructor(&callstack);
+ dwfl_report_end(dwfl, NULL, NULL);
+ dwfl_end(dwfl);
+
+ return 0;
}
projects / platform / core / system / crash-worker.git / blobdiff