76 lines
2.5 KiB
C
76 lines
2.5 KiB
C
#include "ulib.h"
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/*
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* Only ever spawned by cwdtest.c, with no argv at all -- unlike every other
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* *test / *target pair in this kernel (which rendezvous over a shared pipe
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* handle passed as an argv string), this pair's whole point is that the
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* KERNEL itself hands this process its starting directory at creation time
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* (sched.c's threadCreate/threadCreateUser, via the new initialCwd helper
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* that mirrors initialPgid's own "inherit from whoever is currently
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* running" shape for Thread.pgid), never anything cwdtest.c has to pass
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* explicitly.
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*
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* Proves inheritance first, then proves the inherited value is a real,
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* independent COPY rather than shared state: this process's own later
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* chdir() must not reach back into cwdtest.c's Thread.cwd (cwdtest.c's own
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* post-wait getcwd() check is the other half of that proof).
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*/
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static int streq(const char* a, const char* b)
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{
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while (*a && *a == *b) {
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a++;
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b++;
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}
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return *a == *b;
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}
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int main(void)
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{
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print("cwdtarget: start, pid=");
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printDec(userGetpid());
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print("\n");
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char cwdBuf[64];
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long len = userGetcwd(cwdBuf, sizeof(cwdBuf));
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if (len < 0 || !streq(cwdBuf, "/tmp/cwda")) {
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print("cwdtarget: FAIL inherited cwd, got: ");
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print(len < 0 ? "(error)" : cwdBuf);
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print("\n");
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return 1;
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}
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print("cwdtarget: inherited-cwd-ok\n");
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if (userChdir("/tmp/cwdb") != 0) {
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print("cwdtarget: FAIL chdir /tmp/cwdb\n");
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return 1;
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}
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len = userGetcwd(cwdBuf, sizeof(cwdBuf));
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if (len < 0 || !streq(cwdBuf, "/tmp/cwdb")) {
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print("cwdtarget: FAIL getcwd after own chdir, got: ");
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print(len < 0 ? "(error)" : cwdBuf);
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print("\n");
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return 1;
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}
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/* Relative path again -- must land at /tmp/cwdb/note, a COMPLETELY
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different file than cwdtest.c's own /tmp/cwda/note despite the
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identical relative name "note", since each process resolves it
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against its own Thread.cwd. */
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int fd = (int)userOpen("note", oCreate | oWriteOnly | oTrunc);
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if (fd < 0) {
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print("cwdtarget: FAIL create relative note in cwdb\n");
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return 1;
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}
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const char* payload = "cwdb-payload";
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unsigned long payloadLen = stringLength(payload);
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if (userWrite(fd, payload, payloadLen) != (long)payloadLen) {
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print("cwdtarget: FAIL write relative note in cwdb\n");
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return 1;
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}
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userClose(fd);
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print("cwdtarget: relative-write-cwdb-ok\n");
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return 0;
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}
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