diff options
Diffstat (limited to 'crypto/kerberosIV/lib/krb/k_flock.c')
-rw-r--r-- | crypto/kerberosIV/lib/krb/k_flock.c | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/crypto/kerberosIV/lib/krb/k_flock.c b/crypto/kerberosIV/lib/krb/k_flock.c new file mode 100644 index 0000000..844c34c --- /dev/null +++ b/crypto/kerberosIV/lib/krb/k_flock.c @@ -0,0 +1,95 @@ +/* + * Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the Kungliga Tekniska + * Högskolan and its contributors. + * + * 4. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include "krb_locl.h" + +RCSID("$Id: k_flock.c,v 1.8 1997/04/01 08:18:30 joda Exp $"); + +#define K_OP_MASK (K_LOCK_SH | K_LOCK_EX | K_LOCK_UN) + +int +k_flock(int fd, int operation) +{ +#ifdef HAVE_FLOCK + int op = 0; + if (operation & K_LOCK_SH) + op |= LOCK_SH; + if (operation & K_LOCK_EX) + op |= LOCK_EX; + if (operation & K_LOCK_UN) + op |= LOCK_UN; + if (operation & K_LOCK_NB) + op |= LOCK_NB; + + return flock(fd, op); +#elif defined(HAVE_FCNTL) && defined(F_SETLK) + struct flock arg; + int code, cmd; + + arg.l_whence = SEEK_SET; + arg.l_start = 0; + arg.l_len = 0; /* means to EOF */ + + if (operation & K_LOCK_NB) + cmd = F_SETLK; + else + cmd = F_SETLKW; /* Blocking */ + + switch (operation & K_OP_MASK) { + case K_LOCK_UN: + arg.l_type = F_UNLCK; + code = fcntl(fd, F_SETLK, &arg); + break; + case K_LOCK_SH: + arg.l_type = F_RDLCK; + code = fcntl(fd, cmd, &arg); + break; + case K_LOCK_EX: + arg.l_type = F_WRLCK; + code = fcntl(fd, cmd, &arg); + break; + default: + errno = EINVAL; + code = -1; + break; + } + return code; +#else + return -1; +#endif /* !HAVE_FLOCK */ +} |