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Attempt to log distro name/version in Unix crashlog.

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Factor out fork/execve/read stdout code into own function.
This commit is contained in:
Jonathan G Rennison
2016-06-12 20:58:52 +01:00
parent 8d078acb4e
commit 62631cba02
3 changed files with 115 additions and 74 deletions
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174
src/os/unix/crashlog_unix.cpp
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@@ -20,14 +20,13 @@
#include <signal.h>
#include <sys/utsname.h>
#include <setjmp.h>
#if defined(WITH_DBG_GDB)
#include <unistd.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#if defined(WITH_DBG_GDB)
#include <sys/syscall.h>
#endif /* WITH_DBG_GDB */
#if defined(WITH_PRCTL_PT)
@@ -74,6 +73,60 @@ static void LogStacktraceSigSegvHandler(int sig)
}
#endif
static bool ExecReadStdout(const char *file, char *const *args, char *&buffer, const char *last)
{
int pipefd[2];
if (pipe(pipefd) == -1) return false;
int pid = fork();
if (pid < 0) return false;
if (pid == 0) {
/* child */
close(pipefd[0]); /* Close unused read end */
dup2(pipefd[1], STDOUT_FILENO);
close(pipefd[1]);
int null_fd = open("/dev/null", O_RDWR);
if (null_fd != -1) {
dup2(null_fd, STDERR_FILENO);
dup2(null_fd, STDIN_FILENO);
}
execvp(file, args);
exit(42);
}
/* parent */
close(pipefd[1]); /* Close unused write end */
while (buffer < last) {
ssize_t res = read(pipefd[0], buffer, last - buffer);
if (res < 0) {
if (errno == EINTR) continue;
break;
} else if (res == 0) {
break;
} else {
buffer += res;
}
}
buffer += seprintf(buffer, last, "\n");
close(pipefd[0]); /* close read end */
int status;
int wait_ret = waitpid(pid, &status, 0);
if (wait_ret == -1 || !WIFEXITED(status) || WEXITSTATUS(status) != 0) {
/* command did not appear to run successfully */
return false;
} else {
/* command executed successfully */
return true;
}
}
/**
* Unix implementation for the crash logger.
*/
@@ -107,6 +160,23 @@ class CrashLogUnix : public CrashLog {
);
}
/* virtual */ char *LogOSVersionDetail(char *buffer, const char *last) const
{
struct utsname name;
if (uname(&name) < 0) return buffer;
if (strcmp(name.sysname, "Linux") == 0) {
char *buffer_orig = buffer;
buffer += seprintf(buffer, last, "Distro version:\n");
const char *args[] = { "/bin/sh", "-c", "lsb_release -a || find /etc -maxdepth 1 -type f -a \\( -name '*release' -o -name '*version' \\) -exec head -v {} \\+", NULL };
if (!ExecReadStdout("/bin/sh", const_cast<char* const*>(args), buffer, last)) {
buffer = buffer_orig;
}
}
return buffer;
}
/* virtual */ char *LogError(char *buffer, const char *last, const char *message) const
{
buffer += seprintf(buffer, last,
@@ -253,84 +323,40 @@ class CrashLogUnix : public CrashLog {
pid_t tid = syscall(SYS_gettid);
int pipefd[2];
if (pipe(pipefd) == -1) return buffer;
char *buffer_orig = buffer;
buffer += seprintf(buffer, last, "GDB info:\n");
int pid = fork();
if (pid < 0) return buffer;
char tid_buffer[16];
char disasm_buffer[32];
if (pid == 0) {
/* child */
seprintf(tid_buffer, lastof(tid_buffer), "%d", tid);
close(pipefd[0]); /* Close unused read end */
dup2(pipefd[1], STDOUT_FILENO);
close(pipefd[1]);
int null_fd = open("/dev/null", O_RDWR);
if (null_fd != -1) {
dup2(null_fd, STDERR_FILENO);
dup2(null_fd, STDIN_FILENO);
}
std::vector<const char *> args;
args.push_back("gdb");
args.push_back("-n");
args.push_back("-p");
args.push_back(tid_buffer);
args.push_back("-batch");
char tid_buffer[16];
char disasm_buffer[32];
seprintf(tid_buffer, lastof(tid_buffer), "%d", tid);
std::vector<const char *> args;
args.push_back("gdb");
args.push_back("-n");
args.push_back("-p");
args.push_back(tid_buffer);
args.push_back("-batch");
args.push_back("-ex");
args.push_back("echo \\nBacktrace:\\n");
args.push_back("-ex");
args.push_back("bt full");
args.push_back("-ex");
args.push_back("echo \\nBacktrace:\\n");
args.push_back("-ex");
args.push_back("bt full");
#ifdef WITH_SIGACTION
if (this->GetMessage() == NULL && this->signal_instruction_ptr_valid) {
seprintf(disasm_buffer, lastof(disasm_buffer), "x/1i %p", this->signal_instruction_ptr);
args.push_back("-ex");
args.push_back("set disassembly-flavor intel");
args.push_back("-ex");
args.push_back("echo \\nFault instruction:\\n");
args.push_back("-ex");
args.push_back(disasm_buffer);
}
if (this->GetMessage() == NULL && this->signal_instruction_ptr_valid) {
seprintf(disasm_buffer, lastof(disasm_buffer), "x/1i %p", this->signal_instruction_ptr);
args.push_back("-ex");
args.push_back("set disassembly-flavor intel");
args.push_back("-ex");
args.push_back("echo \\nFault instruction:\\n");
args.push_back("-ex");
args.push_back(disasm_buffer);
}
#endif
args.push_back(NULL);
execvp("gdb", const_cast<char* const*>(&(args[0])));
exit(42);
}
/* parent */
close(pipefd[1]); /* Close unused write end */
char *buffer_orig = buffer;
buffer += seprintf(buffer, last, "GDB info:\n");
while (buffer < last) {
ssize_t res = read(pipefd[0], buffer, last - buffer);
if (res < 0) {
if (errno == EINTR) continue;
break;
} else if (res == 0) {
break;
} else {
buffer += res;
}
}
buffer += seprintf(buffer, last, "\n");
close(pipefd[0]); /* close read end */
int status;
int wait_ret = waitpid(pid, &status, 0);
if (wait_ret == -1 || !WIFEXITED(status) || WEXITSTATUS(status) != 0) {
/* gdb did not appear to run successfully */
args.push_back(NULL);
if (!ExecReadStdout("gdb", const_cast<char* const*>(&(args[0])), buffer, last)) {
buffer = buffer_orig;
}
#endif /* WITH_DBG_GDB */