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| | /*
* Copyright (C) 2012-2020 all contributors <cmogstored-public@yhbt.net>
* License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
*/
/* stringify +s+ */
#define MOG_STR(s) MOG_STR0(s)
#define MOG_STR0(s) #s
/*
* some systems define EWOULDBLOCK to a different value than EAGAIN,
* but POSIX allows them to be identical.
*/
#if defined(EWOULDBLOCK) && (EWOULDBLOCK != EAGAIN)
# define case_EAGAIN case EAGAIN: case EWOULDBLOCK
#else
# define case_EAGAIN case EAGAIN
#endif
/* free(3) causes compiler warnings on const, so we de-const here */
static inline void mog_free(const void *ptr)
{
union { const void *in; void *out; } deconst = { .in = ptr };
free(deconst.out);
}
#define PRESERVE_ERRNO(code) do { \
int save_err = errno; \
code; \
errno = save_err; \
} while (0)
# define CHECK(type, expect, expr) do { \
type checkvar = (expr); \
assert(checkvar==(expect)&& "BUG" && __FILE__ && __LINE__); \
} while (0)
/* compiler should optimize this away */
__attribute__((const)) static inline off_t off_t_max(void)
{
return (off_t)(sizeof(long) == sizeof(off_t) ? LONG_MAX : LLONG_MAX);
}
#if defined(HAVE_IOCTL) && defined(FIONBIO)
/*
* FIONBIO * requires only one syscall for reliable operation rather than
* two syscalls with fcntl() calls, so use it if possible.
*/
static inline int mog_set_nonblocking(int fd, const bool value)
{
int flag = value ? 1 : 0;
return ioctl(fd, FIONBIO, &flag);
}
#else /* use gnulib */
#include "nonblocking.h"
#define mog_set_nonblocking(fd, value) set_nonblocking_flag((fd), (value))
#endif
/*
* the only FD_* flag that exists as of 2012 is FD_CLOEXEC, if new ones
* ever get defined, we wouldn't be using them in the first place without
* updating this code... (no way they'd be on by default).
*/
static inline int mog_set_cloexec(int fd, const bool set) /* vfork-safe */
{
return fcntl(fd, F_SETFD, set ? FD_CLOEXEC : 0);
}
static inline bool mog_pthread_create_retryable(const int err)
{
/*
* older versions of glibc return ENOMEM instead of EAGAIN
* ref: https://www.sourceware.org/bugzilla/show_bug.cgi?id=386
* Remove the ENOMEM check by 2023 (unless other OSes have this
* bug).
*/
return (err == EAGAIN || err == ENOMEM);
}
|