Initial import

examples/ctrlc.c

@@ -0,0 +1,66 @@
+#if 0
+/*─────────────────────────────────────────────────────────────────╗
+│ To the extent possible under law, Justine Tunney has waived      │
+│ all copyright and related or neighboring rights to this file,    │
+│ as it is written in the following disclaimers:                   │
+│   • http://unlicense.org/                                        │
+│   • http://creativecommons.org/publicdomain/zero/1.0/            │
+╚─────────────────────────────────────────────────────────────────*/
+#endif
+#include "libc/calls/calls.h"
+#include "libc/log/check.h"
+#include "libc/log/log.h"
+#include "libc/mem/mem.h"
+#include "libc/runtime/gc.h"
+#include "libc/runtime/runtime.h"
+#include "libc/stdio/stdio.h"
+#include "libc/str/str.h"
+#include "libc/sysv/consts/exit.h"
+#include "libc/sysv/consts/fileno.h"
+#include "libc/sysv/consts/sig.h"
+
+#define kTutorialMessage "This echos stdio until Ctrl+C is pressed.\n"
+#define kVictoryMessage  "\rGot Ctrl+C and longjmp() ran dtors (>'.')>\n"
+
+jmp_buf jb;
+
+void GotCtrlC(int sig) {
+  gclongjmp(jb, 1);
+  unreachable;
+}
+
+size_t HowManyBytesOfHeapMemoryAreAllocated(void) {
+  return mallinfo().uordblks;
+}
+
+void ReadAndPrintLinesLoop(void) {
+  ssize_t got;
+  unsigned char *buf;
+  buf = gc(malloc(BUFSIZ));
+  CHECK_NE(0, HowManyBytesOfHeapMemoryAreAllocated());
+  for (;;) {
+    CHECK_NE(-1, (got = read(STDIN_FILENO, buf, BUFSIZ)));
+    CHECK_EQ(got, write(STDOUT_FILENO, buf, got));
+  }
+}
+
+int main(int argc, char *argv[]) {
+  int rc;
+  rc = 0;
+  showcrashreports();
+  if (cancolor()) {
+    CHECK_EQ(0 /* cosmo runtime doesn't link malloc */,
+             HowManyBytesOfHeapMemoryAreAllocated());
+    puts("This echos stdio until Ctrl+C is pressed.");
+    if (!(rc = setjmp(jb))) {
+      CHECK_NE(SIG_ERR, signal(SIGINT, GotCtrlC));
+      ReadAndPrintLinesLoop();
+      unreachable;
+    } else {
+      --rc;
+    }
+    CHECK_EQ(0, HowManyBytesOfHeapMemoryAreAllocated());
+    puts("\rGot Ctrl+C and longjmp() ran dtors (>'.')>");
+  }
+  return rc;
+}