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/*++
/* 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>
#include <stdlib.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);
}
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