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Initial shot at writing an ioquake3 autoupdater.

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This commit is contained in:
Ryan C. Gordon 2017-05-25 14:13:18 -04:00
parent c65d2c2657
commit 4729c683fd
6 changed files with 1147 additions and 22 deletions
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46
code/sys/sys_main.c
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@ -31,6 +31,10 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#include <ctype.h>
#include <errno.h>
#ifndef _WIN32
#include <unistd.h>
#endif
#ifndef DEDICATED
#ifdef USE_LOCAL_HEADERS
# include "SDL.h"
@ -659,6 +663,48 @@ int main( int argc, char **argv )
int i;
char commandLine[ MAX_STRING_CHARS ] = { 0 };
#ifdef USE_AUTOUPDATER
{
#ifndef AUTOUPDATER_BIN
#error The build system should have defined AUTOUPDATER_BIN
#endif
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
#ifndef DEDICATED
// SDL version check