88 lines
1.8 KiB
C
88 lines
1.8 KiB
C
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#include <assert.h>
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#include <fcntl.h>
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#include <getopt.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include "pipe.h"
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int cmdline (int, char **, bool *, char **, char **, size_t *);
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void
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usage (void)
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{
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printf ("Usage: ipc [options] EXEC ARG\n");
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printf (" Send ARG through a pipe to child process that runs EXEC.\n");
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printf (" Option is:\n");
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printf (" -s Use posix_spawn() instead of fork() and exec().\n");
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}
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int
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main (int argc, char **argv)
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{
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bool use_spawn = false;
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char *exec = NULL;
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char *fname = NULL;
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size_t lineno = -1;
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if (cmdline (argc, argv, &use_spawn, &exec, &fname, &lineno) < 0)
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{
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usage ();
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return EXIT_FAILURE;
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}
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// Use fork/exec or spawn to run the executable exec
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char *sum = NULL;
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if (!use_spawn)
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sum = get_result (exec, fname);
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else
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sum = spawn_result (exec, fname);
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if (sum == NULL)
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return EXIT_FAILURE;
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printf ("%s(%s) = '%s'\n", exec, fname, sum);
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// If you get an error here, it's because sum is not dynamically
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// allocated correctly.
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free (sum);
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return EXIT_SUCCESS;
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}
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/* Helper for parsing the command line arguments. Sets spawn,
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filename, and lineno as call-by-reference parameters. Return 0
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on success, -1 otherwise. */
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int
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cmdline (int argc, char **argv, bool *spawn, char **exec, char **filename,
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size_t *lineno)
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{
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int option;
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while ((option = getopt (argc, argv, "sh")) != -1)
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{
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switch (option)
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{
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case 's':
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*spawn = true;
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break;
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case 'h':
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return -1;
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break;
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default:
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return -1;
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}
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}
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if (optind + 2 != argc)
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return -1;
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*exec = argv[optind];
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*filename = argv[optind + 1];
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return 0;
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}
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