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| author | Rich Felker <dalias@aerifal.cx> | 2011-03-10 21:34:19 -0500 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2011-03-10 21:34:19 -0500 |
| commit | 81af503610761a69476a3adbe8341fa8b6d078aa (patch) | |
| tree | 87d40059752e8c9db136c3b53f25bc4f1a3a103d /src/conf | |
| parent | 5fcebcde6aeba6ae4a339790beba5331fbcd3b6e (diff) | |
| download | musl-81af503610761a69476a3adbe8341fa8b6d078aa.tar.gz musl-81af503610761a69476a3adbe8341fa8b6d078aa.tar.xz musl-81af503610761a69476a3adbe8341fa8b6d078aa.zip | |
fix sem_open and sem_close to obey posix semantics
multiple opens of the same named semaphore must return the same pointer, and only the last close can unmap it. thus the ugly global state keeping track of mappings. the maximum number of distinct named semaphores that can be opened is limited sufficiently small that the linear searches take trivial time, especially compared to the syscall overhead of these functions.
Diffstat (limited to 'src/conf')
| -rw-r--r-- | src/conf/sysconf.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/src/conf/sysconf.c b/src/conf/sysconf.c index cdaeb2a6..a660257d 100644 --- a/src/conf/sysconf.c +++ b/src/conf/sysconf.c @@ -40,8 +40,8 @@ long sysconf(int name) [_SC_VERSION] = VER, [_SC_PAGE_SIZE] = PAGE_SIZE, [_SC_RTSIG_MAX] = 63, /* ?? */ - [_SC_SEM_NSEMS_MAX] = _POSIX_SEM_NSEMS_MAX, - [_SC_SEM_VALUE_MAX] = _POSIX_SEM_VALUE_MAX, + [_SC_SEM_NSEMS_MAX] = SEM_NSEMS_MAX, + [_SC_SEM_VALUE_MAX] = OFLOW, [_SC_SIGQUEUE_MAX] = -1, [_SC_TIMER_MAX] = -1, [_SC_BC_BASE_MAX] = _POSIX2_BC_BASE_MAX, @@ -215,8 +215,8 @@ long sysconf(int name) } else if (values[name] == VER) { return _POSIX_VERSION; } else if (values[name] == OFLOW) { - return ARG_MAX; - } else { - return values[name]; + if (name == _SC_ARG_MAX) return ARG_MAX; + if (name == _SC_SEM_VALUE_MAX) return SEM_VALUE_MAX; } + return values[name]; } |