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commit 5603eacdb3a8d4a5a0bbc1b834d5a7451f6be1a4 Author: Marco Casaroli <[email protected]> AuthorDate: Tue Oct 27 18:43:18 2026 +0100 include/sys/select.h: Add fd_mask and NFDBITS. fd_mask (the element type of fd_set) and NFDBITS (its number of bits) are in the <sys/select.h> of the BSDs, glibc and musl, and programs use them. Some configure scripts also look for fd_mask in <sys/select.h> to find fd_set there: Tcl's did not find it and took int for the select() masks, which then did not compile. fd_set does not change: its element type was already uint32_t. Assisted-by: Claude Code:claude-opus-5-5 Signed-off-by: Marco Casaroli <[email protected]> --- include/sys/select.h | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/include/sys/select.h b/include/sys/select.h index d7c6b7b5496..0dde1decd35 100644 --- a/include/sys/select.h +++ b/include/sys/select.h @@ -53,6 +53,10 @@ #define __SELECT_NUINT32 ((FD_SETSIZE + 31) / 32) +/* The number of bits in one fd_mask, the element type of fd_set */ + +#define NFDBITS (8 * (int)sizeof(fd_mask)) + /* These macros map a file descriptor to an index and bit number */ #define _FD_NDX(fd) ((fd) >> 5) @@ -82,9 +86,11 @@ * Type Definitions ****************************************************************************/ +typedef uint32_t fd_mask; + struct fd_set_s { - uint32_t arr[__SELECT_NUINT32]; + fd_mask arr[__SELECT_NUINT32]; }; typedef struct fd_set_s fd_set;
