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| author | Stefan Metzmacher <metze@samba.org> | 2010-03-22 08:27:58 +0100 |
|---|---|---|
| committer | Stefan Metzmacher <metze@samba.org> | 2010-03-22 17:15:10 +0100 |
| commit | 01f2c023f7d2a4b0e016676638a062a5ba29ec0b (patch) | |
| tree | 3aec66024fd8a61aebd50b6d6824fff3581c883c /lib/util/util.c | |
| parent | 13400a6589a20452097bc338fa742d834bbd6a34 (diff) | |
| download | samba-01f2c023f7d2a4b0e016676638a062a5ba29ec0b.tar.gz samba-01f2c023f7d2a4b0e016676638a062a5ba29ec0b.tar.bz2 samba-01f2c023f7d2a4b0e016676638a062a5ba29ec0b.zip | |
lib/util: add allocate_anonymous_shared()
metze
Diffstat (limited to 'lib/util/util.c')
| -rw-r--r-- | lib/util/util.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/lib/util/util.c b/lib/util/util.c index 0064cef8f2..d645f7edc9 100644 --- a/lib/util/util.c +++ b/lib/util/util.c @@ -25,6 +25,8 @@ #include "system/network.h" #include "system/filesys.h" #include "system/locale.h" +#include "system/shmem.h" + #undef malloc #undef strcasecmp #undef strncasecmp @@ -862,4 +864,30 @@ bool next_token_no_ltrim_talloc(TALLOC_CTX *ctx, return next_token_internal_talloc(ctx, ptr, pp_buff, sep, false); } +/* Map a shared memory buffer of at least nelem counters. */ +void *allocate_anonymous_shared(size_t bufsz) +{ + void *buf; + size_t pagesz = getpagesize(); + + if (bufsz % pagesz) { + bufsz = (bufsz + pagesz) % pagesz; /* round up to pagesz */ + } + +#ifdef MAP_ANON + /* BSD */ + buf = mmap(NULL, bufsz, PROT_READ|PROT_WRITE, MAP_ANON|MAP_SHARED, + -1 /* fd */, 0 /* offset */); +#else + buf = mmap(NULL, bufsz, PROT_READ|PROT_WRITE, MAP_FILE|MAP_SHARED, + open("/dev/zero", O_RDWR), 0 /* offset */); +#endif + + if (buf == MAP_FAILED) { + return NULL; + } + + return buf; + +} |