c/ptest.c


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#include "gbos.h"
/* ptest: exercise the kernel pipe in one process - write some bytes, read them
   back, then close the write end and confirm the reader sees EOF. */
void main(void) {
    unsigned char pr = pipe();
    unsigned char pw = pr + 1;
    int c;
    if (pr == NOFD) { puts("pipe: none free"); nl(); return; }
    fputc(pw, 'H'); fputc(pw, 'i'); fputc(pw, '!');
    c = fgetc(pr); putc(c);
    c = fgetc(pr); putc(c);
    c = fgetc(pr); putc(c);
    nl();
    close(pw);                 /* last writer gone */
    c = fgetc(pr);
    if (c < 0) puts("EOF"); else { puts("got "); putc(c); }
    nl();
    close(pr);
}