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IRIX: Implement makesname()

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makesname() make a semaphore name for use in <sys/sema.h>-type routines on
IRIX.  It takes as input a pointer to an allocated string buffer (sname) of
size METER_NAMSZ, a string prefix (prefix), and a vnode number (v_number).
When complete, sname is returned, pointing to the beginning of a
NULL-terminated string containing the new name, with a maximum of
(METER_NAMSZ-1) characters plus the NULL.  The name is a concatenation of
the string at 'prefix' and the ASCII representation of the number in
'v_number'.

Note: Due to IRIX's use of uint64 to represent vnumber_t and a maximum
semaphore name length of 15 (METER_NAMSZ-1), this function cannot be
guaranteed to produce a name which uniquely describes a vnode.

makesname() is already called from afs_vcache.c but not (or no longer)
available / implemented elsewhere.

Change-Id: I4331c161b68b39a4c067691c97363b637d13ff15
Change-Id: Ia0a615426dc05e01a98e53e89ec3bae3726cac34
Reviewed-on: http://gerrit.openafs.org/2155
Reviewed-by: Chaz Chandler <clc31@inbox.com>
Tested-by: Chaz Chandler <clc31@inbox.com>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
This commit is contained in:
Chaz Chandler 2010-06-14 00:21:50 -04:00 committed by Derrick Brashear
parent 7759e83795
commit b1a50290e6
1 changed files with 57 additions and 0 deletions
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57
src/afs/IRIX/osi_misc.c
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@ -30,6 +30,63 @@ afs_mpservice(void *a)
{
}
/*!
* make a semaphore name for use in <sys/sema.h>-type routines on
* IRIX
*
* \param[out] sname will contain the semaphore name and
* should point to an allocated string
* buffer of size METER_NAMSZ
* \param[in] prefix string with which to start the name
* \param[in] v_number vnode number to complete the name
*
* \post sname will point to the beginning of a NULL-terminated
* string to be used as a semaphore name with a maximum of
* (METER_NAMSZ-1) characters plus the NULL. The name is a
* concatenation of the string at 'prefix' and the ASCII
* representation of the number in 'v_number'. sname is
* returned.
*
* \note Due to IRIX's use of uint64_t to represent vnumber_t and a
* maximum semaphore name length of 15 (METER_NAMSZ-1), this
* function cannot be guaranteed to produce a name which
* uniquely describes a vnode.
*
*/
char *
makesname(char *sname, const char *prefix, vnumber_t v_number)
{
char vnbuf[21]; /* max number of uint64 decimal digits + 1 */
size_t prlen, vnlen;
if (sname) {
/*
* Note: IRIX doesn't have realloc() available in the
* kernel, so the openafs util implementation of snprintf is
* not usable. What follows is intended to reproduce the
* behavior of:
* snprintf(sname, METER_NAMSZ, "%s%llu", prefix,
* (unsigned long long)v_number);
* Additionally, the kernel only provides a void sprintf(),
* making length checking slightly more difficult.
*/
prlen = strlen(prefix);
if (prlen > METER_NAMSZ-1)
prlen = METER_NAMSZ-1;
strncpy(sname, prefix, prlen);
memset(vnbuf, 0, sizeof(vnbuf));
sprintf(vnbuf, "%llu", (unsigned long long)v_number);
vnlen = strlen(vnbuf);
if (vnlen+prlen > METER_NAMSZ-1)
vnlen = METER_NAMSZ-1-prlen;
if (vnlen > 0)
strncpy(&(sname[prlen]), vnbuf, vnlen);
sname[vnlen+prlen] = '\0';
}
return sname;
}
#ifdef AFS_SGI_VNODE_GLUE
#include <sys/invent.h>
extern mutex_t afs_init_kern_lock;