54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
#include "ulib.h"
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/*
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* Companion to stderrwriter.c -- reads fd 0 (redirected by the shell to a
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* REAL file via `<`, jobctlApplyRedirects) in a loop until a real EOF,
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* exactly like redirreader.c does, then compares byte-for-byte against two
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* back-to-back copies of stderrwriter.c's own payload -- proof that `2>`
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* (create/truncate) followed by `2>>` (append) on the SAME path produced
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* exactly that file, not a truncated/duplicated/reordered one.
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*
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* This process's own fd 1 (stdout) is NOT redirected -- print() (ulib.h)
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* reaches the real console exactly like any unredirected demo, so the
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* needle below is exactly as observable to ci-test.sh as every other one.
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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("stderrreader: reading redirected stdin\n");
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char buffer[80];
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unsigned long total = 0;
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for (;;) {
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long got = userRead(0, buffer + total, sizeof(buffer) - 1 - total);
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if (got < 0) {
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print("stderrreader: FAIL read\n");
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return 1;
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}
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if (got == 0)
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break;
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total += (unsigned long)got;
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if (total >= sizeof(buffer) - 1)
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break;
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}
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buffer[total] = 0;
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print("stderrreader: got: ");
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print(buffer);
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print("\n");
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int ok = streq(buffer, "stderr-payload-okstderr-payload-ok");
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print(ok ? "stderrreader: payload-ok\n" : "stderrreader: payload-FAIL\n");
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return ok ? 0 : 1;
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}
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