/usr/include/x86_64-linux-musl/sys/select.h is in musl-dev 1.1.19-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 | #ifndef _SYS_SELECT_H
#define _SYS_SELECT_H
#ifdef __cplusplus
extern "C" {
#endif
#include <features.h>
#define __NEED_size_t
#define __NEED_time_t
#define __NEED_suseconds_t
#define __NEED_struct_timeval
#define __NEED_struct_timespec
#define __NEED_sigset_t
#include <bits/alltypes.h>
#define FD_SETSIZE 1024
typedef unsigned long fd_mask;
typedef struct {
unsigned long fds_bits[FD_SETSIZE / 8 / sizeof(long)];
} fd_set;
#define FD_ZERO(s) do { int __i; unsigned long *__b=(s)->fds_bits; for(__i=sizeof (fd_set)/sizeof (long); __i; __i--) *__b++=0; } while(0)
#define FD_SET(d, s) ((s)->fds_bits[(d)/(8*sizeof(long))] |= (1UL<<((d)%(8*sizeof(long)))))
#define FD_CLR(d, s) ((s)->fds_bits[(d)/(8*sizeof(long))] &= ~(1UL<<((d)%(8*sizeof(long)))))
#define FD_ISSET(d, s) !!((s)->fds_bits[(d)/(8*sizeof(long))] & (1UL<<((d)%(8*sizeof(long)))))
int select (int, fd_set *__restrict, fd_set *__restrict, fd_set *__restrict, struct timeval *__restrict);
int pselect (int, fd_set *__restrict, fd_set *__restrict, fd_set *__restrict, const struct timespec *__restrict, const sigset_t *__restrict);
#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
#define NFDBITS (8*(int)sizeof(long))
#endif
#ifdef __cplusplus
}
#endif
#endif
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