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proper error handling for fcntl F_GETOWN on modern kernels

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on old kernels, there's no way to detect errors; we must assume
negative syscall return values are pgrp ids. but if the F_GETOWN_EX
fcntl works, we can get a reliable answer.
This commit is contained in:
Rich Felker 2012-06-20 22:16:47 -04:00
commit 4e8b0938d9
5 changed files with 29 additions and 1 deletions
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11
include/fcntl.h
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@ -99,6 +99,17 @@ int posix_fallocate(int, off_t, off_t);
int lockf(int, int, off_t);
#endif
#if defined(_GNU_SOURCE)
#define F_OWNER_TID 0
#define F_OWNER_PID 1
#define F_OWNER_PGRP 2
#define F_OWNER_GID 2
struct f_owner_ex {
int type;
pid_t pid;
};
#endif
#if defined(_LARGEFILE64_SOURCE) || defined(_GNU_SOURCE)
#define open64 open
#define openat64 openat