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Move the autoupdater launcher into its own public domain source file.

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So other games can steal this piece if they want.
This commit is contained in:
Ryan C. Gordon 2017-05-31 01:21:21 -04:00
parent cf5dd87f57
commit d0da0724e7
3 changed files with 81 additions and 65 deletions
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77
code/sys/sys_autoupdater.c Normal file
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@ -0,0 +1,77 @@
/*
The code in this file is in the public domain. The rest of ioquake3
is licensed until the GPLv2. Do not mingle code, please!
*/
#ifdef USE_AUTOUPDATER
# ifndef AUTOUPDATER_BIN
# error The build system should have defined AUTOUPDATER_BIN
# endif
# ifdef _WIN32
# define WIN32_LEAN_AND_MEAN 1
# include <windows.h>
# else
# include <unistd.h>
# endif
# include <stdio.h>
# include <string.h>
#endif
void Sys_LaunchAutoupdater(int argc, char **argv)
{
#ifdef USE_AUTOUPDATER
#ifdef _WIN32
{
/* We don't need the Unix pipe() tapdance here because Windows lets children wait on parent processes. */
PROCESS_INFORMATION procinfo;
char cmdline[128];
sprintf(cmdline, AUTOUPDATER_BIN " --waitpid %u", (unsigned int) GetCurrentProcessId());
if (CreateProcessA(AUTOUPDATER_BIN, cmdline, NULL, NULL, FALSE, 0, NULL, NULL, NULL, &procinfo))
{
/* close handles now so child cleans up immediately if nothing to do */
CloseHandle(procinfo.hProcess);
CloseHandle(procinfo.hThread);
}
}
#else
int updater_pipes[2];
if (pipe(updater_pipes) == 0)
{
pid_t pid = fork();
if (pid == -1) /* failure, oh well. */
{
close(updater_pipes[0]);
close(updater_pipes[1]);
}
else if (pid == 0) /* child process */
{
close(updater_pipes[1]); /* don't need write end. */
if (dup2(updater_pipes[0], 3) != -1)
{
char pidstr[64];
char *ptr = strrchr(argv[0], '/');
if (ptr)
*ptr = '\0';
chdir(argv[0]);
#ifdef __APPLE__
chdir("../.."); /* put this at base of app bundle so paths make sense later. */
#endif
snprintf(pidstr, sizeof (pidstr), "%lld", (long long) getppid());
execl(AUTOUPDATER_BIN, AUTOUPDATER_BIN, "--waitpid", pidstr, NULL);
}
_exit(0); /* oh well. */
}
else /* parent process */
{
/* leave the write end open until we terminate so updater can block on it. */
close(updater_pipes[0]);
}
}
#endif
#endif
(void) argc; (void) argv; /* possibly unused. Pacify compilers. */
}