.

fetcher/fetcher.c

@@ -0,0 +1,60 @@
+#include <unistd.h>
+#include <libowfat/errmsg.h>
+#include <libowfat/buffer.h>
+#include <sys/wait.h>
+#include "fetcher.h"
+
+#define dieusage() die(100, "usage: ", argv0, " [-v] [-j jobs] URL...\n\
+    (-v means verbose)")
+
+int verbose = 0;
+int jobs = 5;
+
+int queuepipe[2];
+/* merged stdout of workers */
+int errpipe[2];
+/* merged stderr of workers */
+int outpipe[2];
+
+int main(int argc, char **argv)
+{
+  errmsg_iam(*argv);
+  int i;
+  for (i = 1; i < argc; i++) {
+    if (argv[i][0] != '-') break;
+    if (argv[i][1] == '-' && !argv[i][2]) break;
+    switch (argv[i][1]) {
+    case 'j':
+      i++;
+      jobs = atoi(argv[i]);
+      if (jobs < 1)
+        die(100, "value for -n must be >= 1");
+      break;
+    case 'v':
+      verbose = 1;
+      break;
+    default: dieusage();
+    }
+  }
+  argc -= i;
+  argv += i;
+  if (argc < 1) dieusage();
+  
+  if (pipe(errpipe)<0
+   || pipe(outpipe)<0
+  ) diesys(111, "pipe");
+  
+  if (verbose) {
+    buffer_puts(buffer_2, "Using "); 
+    buffer_putlong(buffer_2, jobs); 
+    buffer_puts(buffer_2, " parallel jobs\n"); 
+    buffer_flush(buffer_2);
+  }
+
+  char **fetchcmd = (char *[]){"curl", "-o", "a.txt", "https://lab0x13.site/index.html", NULL};
+  pid_t pid = spawnchild(fetchcmd, outpipe[1], errpipe[1]);
+  if (pid<0)
+    exit(111);
+  waitpid(pid, NULL, 0);
+  exit(0);
+}