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dumpname.cpp
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dumpname.cpp
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
#include "createdump.h"
#include <time.h>
#ifdef HOST_WINDOWS
#include <winsock.h>
#endif
//
// Format the core dump name using a subset of the standard coredump pattern
// defined here: https://man7.org/linux/man-pages/man5/core.5.html.
//
// Supported:
//
// %% A single % character.
// %d PID of dumped process (for backwards createdump compatibility).
// %p PID of dumped process.
// %e The process executable filename.
// %h Hostname return by gethostname().
// %t Time of dump, expressed as seconds since the Epoch, 1970-01-01 00:00:00 +0000 (UTC).
//
// Unsupported:
//
// %c Core file size soft resource limit of crashing process.
// %E Pathname of executable, with slashes ('/') replaced by exclamation marks ('!').
// %g Numeric real GID of dumped process.
// %i TID of thread that triggered core dump, as seen in the PID namespace in which the thread resides.
// %I TID of thread that triggered core dump, as seen in the initial PID namespace.
// %P PID of dumped process, as seen in the initial PID namespace.
// %s Number of signal causing dump.
// %u Numeric real UID of dumped process.
//
bool
FormatDumpName(std::string& name, const char* pattern, const char* exename, int pid)
{
const char* p = pattern;
if (*p == '|')
{
printf_error("Pipe syntax in dump name not supported\n");
return false;
}
#ifdef HOST_WINDOWS
WSAData wsadata;
int wsaerr = WSAStartup(1, &wsadata);
#endif
while (*p)
{
if (*p != '%')
{
name.append(1, *p);
}
else
{
switch (*++p)
{
case '\0':
return true;
case '%':
name.append(1, '%');
break;
// process Id
case 'd':
case 'p':
name.append(std::to_string(pid));
break;
// time of dump
case 't':
time_t dumptime;
time(&dumptime);
name.append(std::to_string(dumptime));
break;
// hostname
case 'h': {
ArrayHolder<char> buffer = new char[MAX_LONGPATH + 1];
if (gethostname(buffer, MAX_LONGPATH) != 0)
{
printf_error("Could not get the host name for dump name: %d\n",
#ifdef HOST_WINDOWS
WSAGetLastError());
#else
errno);
#endif
return false;
}
name.append(buffer);
break;
}
// executable file name
case 'e':
name.append(exename);
break;
// executable file path with / replaced with !
case 'E':
// signal number that caused the dump
case 's':
// gid
case 'g':
// coredump size limit
case 'c':
// the numeric real UID of dumped process
case 'u':
// thread id that triggered the dump
case 'i':
case 'I':
// pid of dumped process
case 'P':
default:
printf_error("Invalid dump name format char '%c'\n", *p);
return false;
}
}
++p;
}
return true;
}