#include <fcntl.h>
#include <errno.h>
#include <string.h>
+#include <unistd.h>
+
+void
+usage (char *argv0, int help)
+{
+ char *progname = strrchr(argv0, '/');
+
+ if (progname == NULL)
+ progname = argv0;
+
+ fprintf (help ? stdout : stderr,
+ "Usage: %s [-e] file\n", progname);
+
+ if (!help)
+ {
+ fprintf (stderr, " or try '-h' for help\n");
+ exit (1);
+ }
+
+ printf ("Create the given file with O_EXCL...\n");
+ printf (" -e expect EEXIST\n");
+ printf (" -h print help");
+ printf (" Exit status is 0 on success, 1 on failure\n");
+}
int main(int argc, char **argv)
{
int rc;
-
- if (argc != 2) {
- printf("usage: %s name\n", argv[0]);
+ int want_eexist = 0;
+
+ while ((rc = getopt (argc, argv, "eh")) != -1)
+ switch (rc)
+ {
+ case 'e':
+ want_eexist = 1;
+ break;
+ case 'h':
+ usage (argv[1], 1);
+ return (0);
+ default:
+ usage (argv[0], 0);
+ }
+
+ if (optind != argc - 1) {
+ usage (argv[0], 0);
return 1;
}
- rc = open(argv[1], O_CREAT|O_EXCL, 0644);
+ rc = open(argv[optind], O_CREAT|O_EXCL, 0644);
if (rc == -1)
- printf("open failed: %s\n", strerror(errno));
- else
- printf("open success.\n");
- return 0;
+ {
+ if (want_eexist && errno == EEXIST)
+ {
+ printf("open failed: %s (expected)\n", strerror(errno));
+ return (0);
+ }
+ printf("open failed: %s\n", strerror(errno));
+ return (1);
+ } else {
+ if (want_eexist)
+ {
+ printf("open success (expecting EEXIST).\n");
+ return (1);
+ }
+ printf("open success.\n");
+ return (0);
+ }
+
+ return ((rc == 0) ? 0 : 1);
}