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possibly slightly faster win32 process spawn from http://lists.samba.org/archive/ccache/2006q3/000242.html

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git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@10993 626c5289-ae23-0410-ae9c-e8d60b6d4f22
This commit is contained in:
William S Fulton 2008-12-20 23:59:03 +00:00
commit d115e52bc0
1 changed files with 51 additions and 0 deletions
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51
CCache/execute.c
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@ -55,6 +55,8 @@ int execute(char **argv,
const char *path_stderr)
{
#ifdef _WIN32
#if 0
PROCESS_INFORMATION pinfo;
STARTUPINFO sinfo;
BOOL ret;
@ -107,6 +109,55 @@ int execute(char **argv,
CloseHandle(pinfo.hThread);
return exitcode;
#else /* possibly slightly faster */
/* Should be portable */
int status = -2;
int fd, std_od = -1, std_ed = -1;
/* TODO: needs moving after possible exit() below, but before stdout is redirected */
if (ccache_verbose) {
display_execute_args(argv);
}
unlink(path_stdout);
std_od = _dup(1);
fd = _open(path_stdout, O_WRONLY|O_CREAT|O_TRUNC|O_EXCL|O_BINARY, 0666);
if (fd == -1) {
status = STATUS_NOCACHE;
cc_log("stdout error: failed to open %s\n", path_stdout);
goto out;
}
_dup2(fd, 1);
_close(fd);
unlink(path_stderr);
fd = _open(path_stderr, O_WRONLY|O_CREAT|O_TRUNC|O_EXCL|O_BINARY, 0666);
std_ed = _dup(2);
if (fd == -1) {
status = STATUS_NOCACHE;
cc_log("stderr error: failed to open %s\n", path_stderr);
goto out;
}
_dup2(fd, 2);
_close(fd);
/* Spawn process (_exec* familly doesn't return) */
status = _spawnv(_P_WAIT, argv[0], (const char **)argv);
out:
cc_log("%s:\n stdout -> %s\n stderr -> %s\n process status=%i\n",
argv[0], path_stdout, path_stderr, status);
if (status == -1) cc_log("Error %i: %s\n", errno, strerror(errno));
/* Restore descriptors */
if (std_od != -1) _dup2(std_od, 1);
if (std_ed != -1) _dup2(std_ed, 2);
_flushall();
return (status>0);
#endif
#else
pid_t pid;
int status;