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ed8fadea37
* Introduce env.com
Handy tool for debugging environment issues.
* Inject path as COSMOPOLITAN_PROGRAM_EXECUTABLE
`argv[0]` was previously being used as a communication channel between
the loader and the binary, giving the binary its full path for use e.g.
in `GetProgramExecutableName`. But `argv[0]` is not a good channel for
this; much of what made 2a3813c6 so gross is due to that.
This change fixes the issue by preserving `argv[0]` and establishing a
new communication channel: `COSMOPOLITAN_PROGRAM_EXECUTABLE`.
The M1 loader will always set this as the first variable. Linux should
soon follow. On the other side, `GetProgramExecutableName` checks that
variable first. If it sees it, it trusts it as-is.
A lot of the churn in `ape/ape-m1.c` in this change is actually backing
out hacks introduced in 2a3813c6; the best comparison is:
git diff 2a3813c6^..
10 lines
209 B
C
10 lines
209 B
C
#include "libc/stdio/stdio.h"
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#include "libc/runtime/runtime.h"
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int main(int argc, char* argv[]) {
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printf("%s\n", argv[0]);
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for (char **p = environ; *p; ++p) {
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printf(" %s\n", *p);
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}
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return 0;
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}
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