61 lines
2.4 KiB
C
61 lines
2.4 KiB
C
#if 0
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/*─────────────────────────────────────────────────────────────────╗
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│ To the extent possible under law, Justine Tunney has waived │
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│ all copyright and related or neighboring rights to this file, │
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│ as it is written in the following disclaimers: │
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│ • http://unlicense.org/ │
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│ • http://creativecommons.org/publicdomain/zero/1.0/ │
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╚─────────────────────────────────────────────────────────────────*/
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#endif
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#include "libc/alg/alg.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/hefty/spawn.h"
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#include "libc/fmt/conv.h"
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#include "libc/limits.h"
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#include "libc/log/check.h"
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#include "libc/runtime/gc.h"
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#include "libc/stdio/stdio.h"
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#include "libc/sysv/consts/fileno.h"
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#include "libc/x/x.h"
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const char kProgram[] = "o/default/examples/hello.com";
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int main(int argc, char *argv[]) {
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/**
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* Runs make if hello.com doesn't exist.
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*
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* 1. gc() automates calling free() on return.
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* 2. xasprintf("foo %s", "bar") is our version of "foo %s" % ("bar")
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* 3. Demonstrates correct escaping for bourne shell
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*/
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if (!fileexists(kProgram)) {
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system(gc(xasprintf("%s '%s'", "make -j4",
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gc(replacestr(kProgram, "'", "'\"'\"'")))));
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}
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/**
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* Our version of subprocess.Popen
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* 1. Doesn't require fork() so pain-free on NT
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* 2. Google checks are like assert() but better
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*/
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ssize_t transferred;
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int child, wstatus, procfds[3] = {STDIN_FILENO, -1, STDERR_FILENO};
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CHECK_NE(-1,
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(child = spawnve(0, procfds, /* run w/o shell */ kProgram,
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(char *const[]){/* argv[0] */ basename(kProgram),
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/* argv[1] */ "boop",
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/* sentinel */ NULL},
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environ)));
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printf("%s %s: ", kProgram, "says");
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fflush(stdout);
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for (;;) {
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transferred = copyfd(procfds[1], NULL, fileno(stdout), NULL, INT_MAX, 0);
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CHECK_NE(-1, transferred);
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if (!transferred) break;
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}
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CHECK_NE(-1, waitpid(child, &wstatus, 0));
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CHECK_EQ(0, WEXITSTATUS(wstatus));
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return 0;
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}
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