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fix sem_open and sem_close to obey posix semantics

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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.
This commit is contained in:
Rich Felker 2011-03-10 21:34:19 -05:00
commit 81af503610
4 changed files with 86 additions and 38 deletions
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10
src/conf/sysconf.c
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@ -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];
}