Re: fopen("file","a")

From: Stuart Walsh (stu_at_ipng.org.uk)
Date: 05/26/04

  • Next message: Dag-Erling Smørgrav: "Re: fopen("file","a")" 
    To: "Anton Alin-Adrian" <aanton@reversedhell.net>, <freebsd-hackers@freebsd.org>
Date: Wed, 26 May 2004 14:33:03 +0100

    ----- Original Message -----
    From: "Anton Alin-Adrian" <aanton@reversedhell.net>
    To: <freebsd-hackers@freebsd.org>
    Sent: Saturday, May 22, 2004 5:27 PM
    Subject: fopen("file","a")

    > Hey folks.
    >
    > Running FreeBSD 4.9-RELEASE
    >
    > I am just wondering:
    >
    > man fopen
    > ---man---
    > Upon successful completion fopen(), fdopen() and freopen() return a
    > FILE pointer. Otherwise, NULL is returned and the global variable errno
    is
    > set to indicate the error.
    > ---man---
    >
    >
    > However, the following snippet:
    >
    > --snip--
    > FILE *fp_queue;
    >
    > if ( (fp_queue=fopen(fqueue,"a")) ==NULL);//will wait for locks
    > {
    > perror("fopen(fqueue,\"a\")");
    > //exit(EXIT_FAILURE);
    > }
    > --snip--
    >
    >

    You have a semicolon after your if... looks like a typo, but that will mean
    the perror always gets called.

    Regards,

    Stuart

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  • Next message: Dag-Erling Smørgrav: "Re: fopen("file","a")"