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| author | Tavian Barnes <tavianator@tavianator.com> | 2024-08-09 23:26:25 -0400 |
|---|---|---|
| committer | Tavian Barnes <tavianator@tavianator.com> | 2024-08-09 23:28:55 -0400 |
| commit | 1507cc211f6ce5b4f20f83470eacf44755a0cdcc (patch) | |
| tree | 79f204eeb7ebdceeee027297d48d1d59802d3f66 /src/sighook.c | |
| parent | baf9ee660c9f1d44d64341e225f9e0d7b808424d (diff) | |
| download | bfs-1507cc211f6ce5b4f20f83470eacf44755a0cdcc.tar.xz | |
bfstd: New sysoption() macro to check for POSIX option runtime support
POSIX allows optional features to be supported at compile time but not
necessarily at run time by defining _POSIX_OPTION to 0 and requiring
users to check sysconf(_SC_OPTION) > 0. The new sysoption() macro
simplifies the check.
sighook() and bfs_spawn() now check for conditional runtime support for
the relevant POSIX options.
Diffstat (limited to 'src/sighook.c')
| -rw-r--r-- | src/sighook.c | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/src/sighook.c b/src/sighook.c index b761a12..3f60405 100644 --- a/src/sighook.c +++ b/src/sighook.c @@ -29,7 +29,13 @@ #include <stdlib.h> #include <unistd.h> -#if _POSIX_SEMAPHORES > 0 +#ifdef _POSIX_SEMAPHORES +# define BFS_POSIX_SEMAPHORES _POSIX_SEMAPHORES +#else +# define BFS_POSIX_SEMAPHORES (-1) +#endif + +#if BFS_POSIX_SEMAPHORES >= 0 # include <semaphore.h> #endif @@ -42,7 +48,7 @@ struct arc { /** The reference itself. */ void *ptr; -#if _POSIX_SEMAPHORES > 0 +#if BFS_POSIX_SEMAPHORES >= 0 /** A semaphore for arc_wake(). */ sem_t sem; /** sem_init() result. */ @@ -57,8 +63,12 @@ static void arc_init(struct arc *arc) { atomic_init(&arc->refs, 0); arc->ptr = NULL; -#if _POSIX_SEMAPHORES > 0 - arc->sem_status = sem_init(&arc->sem, false, 0); +#if BFS_POSIX_SEMAPHORES >= 0 + if (sysoption(SEMAPHORES) > 0) { + arc->sem_status = sem_init(&arc->sem, false, 0); + } else { + arc->sem_status = -1; + } #endif } @@ -93,7 +103,7 @@ static void arc_put(struct arc *arc) { size_t refs = fetch_sub(&arc->refs, 1, release); if (refs == 1) { -#if _POSIX_SEMAPHORES > 0 +#if BFS_POSIX_SEMAPHORES >= 0 if (arc->sem_status == 0 && sem_post(&arc->sem) != 0) { abort(); } @@ -103,7 +113,7 @@ static void arc_put(struct arc *arc) { /** Wait on the semaphore. */ static int arc_sem_wait(struct arc *arc) { -#if _POSIX_SEMAPHORES > 0 +#if BFS_POSIX_SEMAPHORES >= 0 if (arc->sem_status == 0) { while (sem_wait(&arc->sem) != 0) { bfs_everify(errno == EINTR, "sem_wait()"); @@ -146,7 +156,7 @@ done:; static void arc_destroy(struct arc *arc) { bfs_assert(arc_refs(arc) == 0); -#if _POSIX_SEMAPHORES > 0 +#if BFS_POSIX_SEMAPHORES >= 0 if (arc->sem_status == 0) { bfs_everify(sem_destroy(&arc->sem) == 0, "sem_destroy()"); } |