67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
/*++
|
|
/* NAME
|
|
/* fifo_open 1
|
|
/* SUMMARY
|
|
/* fifo client test program
|
|
/* SYNOPSIS
|
|
/* fifo_open
|
|
/* DESCRIPTION
|
|
/* fifo_open creates a FIFO, then attempts to open it for writing
|
|
/* with non-blocking mode enabled. According to the POSIX standard
|
|
/* the open should succeed.
|
|
/* DIAGNOSTICS
|
|
/* Problems are reported to the standard error stream.
|
|
/* LICENSE
|
|
/* .ad
|
|
/* .fi
|
|
/* The Secure Mailer license must be distributed with this software.
|
|
/* AUTHOR(S)
|
|
/* Wietse Venema
|
|
/* IBM T.J. Watson Research
|
|
/* P.O. Box 704
|
|
/* Yorktown Heights, NY 10598, USA
|
|
/*--*/
|
|
|
|
#include <sys/stat.h>
|
|
#include <stdio.h>
|
|
#include <fcntl.h>
|
|
#include <signal.h>
|
|
#include <unistd.h>
|
|
|
|
#define FIFO_PATH "test-fifo"
|
|
#define perrorexit(s) { perror(s); exit(1); }
|
|
|
|
static void cleanup(void)
|
|
{
|
|
printf("Removing fifo %s...\n", FIFO_PATH);
|
|
if (unlink(FIFO_PATH))
|
|
perrorexit("unlink");
|
|
printf("Done.\n");
|
|
}
|
|
|
|
static void stuck(int unused_sig)
|
|
{
|
|
printf("Non-blocking, write-only open of FIFO blocked\n");
|
|
cleanup();
|
|
exit(1);
|
|
}
|
|
|
|
int main(int unused_argc, char **unused_argv)
|
|
{
|
|
(void) unlink(FIFO_PATH);
|
|
printf("Creating fifo %s...\n", FIFO_PATH);
|
|
if (mkfifo(FIFO_PATH, 0600) < 0)
|
|
perrorexit("mkfifo");
|
|
signal(SIGALRM, stuck);
|
|
alarm(5);
|
|
printf("Opening fifo %s, non-blocking, write-only mode...\n", FIFO_PATH);
|
|
if (open(FIFO_PATH, O_WRONLY | O_NONBLOCK, 0) < 0) {
|
|
perror("open");
|
|
cleanup();
|
|
exit(1);
|
|
}
|
|
printf("Non-blocking, write-only open of FIFO succeeded\n");
|
|
cleanup();
|
|
exit(0);
|
|
}
|