diff options
Diffstat (limited to 'libc/sysdeps/linux/common/select.c')
| -rw-r--r-- | libc/sysdeps/linux/common/select.c | 65 |
1 files changed, 57 insertions, 8 deletions
diff --git a/libc/sysdeps/linux/common/select.c b/libc/sysdeps/linux/common/select.c index 34b6e8260..0c2d91984 100644 --- a/libc/sysdeps/linux/common/select.c +++ b/libc/sysdeps/linux/common/select.c @@ -9,6 +9,7 @@ #include <sys/syscall.h> #include <sys/select.h> +#include <stdint.h> #ifdef __UCLIBC_HAS_THREADS_NATIVE__ #include <sysdep-cancel.h> @@ -16,20 +17,65 @@ #define SINGLE_THREAD_P 1 #endif +#define USEC_PER_SEC 1000000L -libc_hidden_proto(select) +extern __typeof(select) __libc_select; + +#if !defined(__NR__newselect) && !defined(__NR_select) && defined __USE_XOPEN2K +# define __NR___libc_pselect6 __NR_pselect6 +_syscall6(int, __libc_pselect6, int, n, fd_set *, readfds, fd_set *, writefds, + fd_set *, exceptfds, const struct timespec *, timeout, + const sigset_t *, sigmask) + +int __libc_select(int n, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, + struct timeval *timeout) +{ + struct timespec _ts, *ts = 0; + if (timeout) { + uint32_t usec; + _ts.tv_sec = timeout->tv_sec; + + /* GNU extension: allow for timespec values where the sub-sec + * field is equal to or more than 1 second. The kernel will + * reject this on us, so take care of the time shift ourself. + * Some applications (like readline and linphone) do this. + * See 'clarification on select() type calls and invalid timeouts' + * on the POSIX general list for more information. + */ + usec = timeout->tv_usec; + if (usec >= USEC_PER_SEC) { + _ts.tv_sec += usec / USEC_PER_SEC; + usec %= USEC_PER_SEC; + } + _ts.tv_nsec = usec * 1000; + + ts = &_ts; + } + + if (SINGLE_THREAD_P) + return __libc_pselect6(n, readfds, writefds, exceptfds, ts, 0); +#ifdef __UCLIBC_HAS_THREADS_NATIVE__ + int oldtype = LIBC_CANCEL_ASYNC (); + int result = __libc_pselect6(n, readfds, writefds, exceptfds, ts, 0); + LIBC_CANCEL_RESET (oldtype); + return result; +#endif + +} + +#else #ifdef __NR__newselect -# undef __NR_select -# define __NR_select __NR__newselect +# define __NR___syscall_select __NR__newselect +#else +# define __NR___syscall_select __NR_select #endif -#define __NR___syscall_select __NR_select -static inline _syscall5(int, __syscall_select, int, n, fd_set *, readfds, +_syscall5(int, __syscall_select, int, n, fd_set *, readfds, fd_set *, writefds, fd_set *, exceptfds, struct timeval *, timeout); -int select(int n, fd_set * readfds, fd_set * writefds, fd_set * exceptfds, - struct timeval * timeout) +int __libc_select(int n, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, + struct timeval *timeout) { if (SINGLE_THREAD_P) return __syscall_select(n, readfds, writefds, exceptfds, timeout); @@ -42,4 +88,7 @@ int select(int n, fd_set * readfds, fd_set * writefds, fd_set * exceptfds, #endif } -libc_hidden_def(select) +#endif + +weak_alias(__libc_select,select) +libc_hidden_weak(select) |