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Lines 23-41
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#include "apr_strings.h" |
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#include "apr_strings.h" |
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#include "apr_hash.h" |
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#include "apr_hash.h" |
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#if APR_USE_SHMEM_MMAP_SHM |
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#if APR_USE_SHMEM_MMAP_SHM+0 || APR_USE_SHMEM_SHMGET+0 |
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/* |
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/* See proc_mutex.c, sem_open, and our_ftok for the reason for all this! */ |
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* For portable use, a shared memory object should be identified by a name of |
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static unsigned int rshash (const char *p) |
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* the form /somename; that is, a null-terminated string of up to NAME_MAX |
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{ |
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* (i.e., 255) characters consisting of an initial slash, followed by one or |
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* more characters, none of which are slashes. |
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*/ |
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#ifndef NAME_MAX |
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#define NAME_MAX 255 |
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#endif |
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/* See proc_mutex.c and sem_open for the reason for all this! */ |
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static unsigned int rshash (const char *p) { |
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/* hash function from Robert Sedgwicks 'Algorithms in C' book */ |
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/* hash function from Robert Sedgwicks 'Algorithms in C' book */ |
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unsigned int b = 378551; |
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unsigned int b = 378551; |
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unsigned int a = 63689; |
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unsigned int a = 63689; |
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Lines 48-54
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return retval; |
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return retval; |
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} |
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} |
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#endif |
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#if APR_USE_SHMEM_MMAP_SHM |
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/* |
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* For portable use, a shared memory object should be identified by a name of |
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* the form /somename; that is, a null-terminated string of up to NAME_MAX |
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* (i.e., 255) characters consisting of an initial slash, followed by one or |
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* more characters, none of which are slashes. |
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*/ |
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#ifndef NAME_MAX |
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#define NAME_MAX 255 |
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#endif |
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static const char *make_shm_open_safe_name(const char *filename, |
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static const char *make_shm_open_safe_name(const char *filename, |
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apr_pool_t *pool) |
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apr_pool_t *pool) |
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{ |
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{ |
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Lines 62-69
static const char *make_shm_open_safe_name(const c
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flen = strlen(filename); |
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flen = strlen(filename); |
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h1 = (apr_hashfunc_default(filename, &flen) & 0xffffffff); |
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h1 = (apr_hashfunc_default(filename, &flen) & 0xffffffff); |
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h2 = (rshash(filename) & 0xffffffff); |
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h2 = (rshash(filename) & 0xffffffff); |
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return apr_psprintf(pool, "/ShM.%xH%x", h1, h2); |
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return apr_psprintf(pool, "/ShM.%xH%x", h1, h2); |
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} |
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} |
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#endif |
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#endif |
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Lines 72-80
static key_t our_ftok(const char *filename)
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{ |
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{ |
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/* to help avoid collisions while still using |
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/* to help avoid collisions while still using |
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* an easily recreated proj_id */ |
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* an easily recreated proj_id */ |
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apr_ssize_t slen = strlen(filename); |
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apr_ssize_t flen; |
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return ftok(filename, |
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unsigned int h1, h2; |
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(int)apr_hashfunc_default(filename, &slen)); |
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flen = strlen(filename); |
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h1 = apr_hashfunc_default(filename, &flen); |
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h2 = rshash(filename); |
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return ftok(filename, h1 ^ h2); |
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} |
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} |
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#endif |
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#endif |
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