cpython/Mac/Tools/pythonw.c

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/*
* This wrapper program executes a python executable hidden inside an
* application bundle inside the Python framework. This is needed to run
* GUI code: some GUI API's don't work unless the program is inside an
* application bundle.
*
* This program uses posix_spawn rather than plain execv because we need
* slightly more control over how the "real" interpreter is executed.
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*/
#include <unistd.h>
#include <spawn.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
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#include <err.h>
#include <dlfcn.h>
#include <stdlib.h>
#include <Python.h>
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extern char** environ;
/*
* Locate the python framework by looking for the
* library that contains Py_Initialize.
*
* In a regular framework the structure is:
*
* Python.framework/Versions/2.7
* /Python
* /Resources/Python.app/Contents/MacOS/Python
*
* In a virtualenv style structure the expected
* structure is:
*
* ROOT
* /bin/pythonw
* /.Python <- the dylib
* /.Resources/Python.app/Contents/MacOS/Python
*
* NOTE: virtualenv's are not an officially supported
* feature, support for that structure is provided as
* a convenience.
*/
static char* get_python_path(void)
{
size_t len;
Dl_info info;
char* end;
char* g_path;
if (dladdr(Py_Initialize, &info) == 0) {
return NULL;
}
len = strlen(info.dli_fname);
g_path = malloc(len+60);
if (g_path == NULL) {
return NULL;
}
strcpy(g_path, info.dli_fname);
end = g_path + len - 1;
while (end != g_path && *end != '/') {
end --;
}
end++;
if (end[1] == '.') {
end++;
}
strcpy(end, "Resources/Python.app/Contents/MacOS/Python");
return g_path;
}
static void
setup_spawnattr(posix_spawnattr_t* spawnattr)
{
size_t ocount;
size_t count;
cpu_type_t cpu_types[1];
short flags = 0;
#ifdef __LP64__
int ch;
#endif
if ((errno = posix_spawnattr_init(spawnattr)) != 0) {
err(2, "posix_spawnattr_int");
/* NOTREACHTED */
}
count = 1;
/* Run the real python executable using the same architure as this
* executable, this allows users to controle the architecture using
* "arch -ppc python"
*/
#if defined(__ppc64__)
cpu_types[0] = CPU_TYPE_POWERPC64;
#elif defined(__x86_64__)
cpu_types[0] = CPU_TYPE_X86_64;
#elif defined(__ppc__)
cpu_types[0] = CPU_TYPE_POWERPC;
#elif defined(__i386__)
cpu_types[0] = CPU_TYPE_X86;
#else
# error "Unknown CPU"
#endif
if (posix_spawnattr_setbinpref_np(spawnattr, count,
cpu_types, &ocount) == -1) {
err(1, "posix_spawnattr_setbinpref");
/* NOTREACHTED */
}
if (count != ocount) {
fprintf(stderr, "posix_spawnattr_setbinpref failed to copy\n");
exit(1);
/* NOTREACHTED */
}
/*
* Set flag that causes posix_spawn to behave like execv
*/
flags |= POSIX_SPAWN_SETEXEC;
if ((errno = posix_spawnattr_setflags(spawnattr, flags)) != 0) {
err(1, "posix_spawnattr_setflags");
/* NOTREACHTED */
}
}
int
main(int argc, char **argv) {
posix_spawnattr_t spawnattr = NULL;
char* exec_path = get_python_path();
setup_spawnattr(&spawnattr);
posix_spawn(NULL, exec_path, NULL,
&spawnattr, argv, environ);
err(1, "posix_spawn: %s", argv[0]);
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/* NOTREACHED */
}