mirror of
https://github.com/UberGames/lilium-voyager.git
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78 lines
2 KiB
C
78 lines
2 KiB
C
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/*
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The code in this file is in the public domain. The rest of ioquake3
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is licensed until the GPLv2. Do not mingle code, please!
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*/
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#ifdef USE_AUTOUPDATER
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# ifndef AUTOUPDATER_BIN
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# error The build system should have defined AUTOUPDATER_BIN
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# endif
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# ifdef _WIN32
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# define WIN32_LEAN_AND_MEAN 1
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# include <windows.h>
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# else
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# include <unistd.h>
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# endif
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# include <stdio.h>
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# include <string.h>
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#endif
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void Sys_LaunchAutoupdater(int argc, char **argv)
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{
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#ifdef USE_AUTOUPDATER
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#ifdef _WIN32
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{
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/* We don't need the Unix pipe() tapdance here because Windows lets children wait on parent processes. */
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PROCESS_INFORMATION procinfo;
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char cmdline[128];
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sprintf(cmdline, AUTOUPDATER_BIN " --waitpid %u", (unsigned int) GetCurrentProcessId());
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if (CreateProcessA(AUTOUPDATER_BIN, cmdline, NULL, NULL, FALSE, 0, NULL, NULL, NULL, &procinfo))
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{
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/* close handles now so child cleans up immediately if nothing to do */
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CloseHandle(procinfo.hProcess);
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CloseHandle(procinfo.hThread);
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}
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}
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#else
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int updater_pipes[2];
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if (pipe(updater_pipes) == 0)
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{
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pid_t pid = fork();
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if (pid == -1) /* failure, oh well. */
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{
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close(updater_pipes[0]);
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close(updater_pipes[1]);
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}
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else if (pid == 0) /* child process */
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{
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close(updater_pipes[1]); /* don't need write end. */
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if (dup2(updater_pipes[0], 3) != -1)
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{
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char pidstr[64];
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char *ptr = strrchr(argv[0], '/');
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if (ptr)
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*ptr = '\0';
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chdir(argv[0]);
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#ifdef __APPLE__
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chdir("../.."); /* put this at base of app bundle so paths make sense later. */
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#endif
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snprintf(pidstr, sizeof (pidstr), "%lld", (long long) getppid());
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execl(AUTOUPDATER_BIN, AUTOUPDATER_BIN, "--waitpid", pidstr, NULL);
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}
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_exit(0); /* oh well. */
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}
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else /* parent process */
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{
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/* leave the write end open until we terminate so updater can block on it. */
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close(updater_pipes[0]);
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}
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}
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#endif
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#endif
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(void) argc; (void) argv; /* possibly unused. Pacify compilers. */
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}
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