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syscall: emulate Flock on AIX

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Reviewed-on: https://go-review.googlesource.com/79095

From-SVN: r255737
This commit is contained in:
Ian Lance Taylor 2017-12-16 01:45:45 +00:00
parent dead5b9978
commit fe6272cc44
2 changed files with 23 additions and 1 deletions
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2
gcc/go/gofrontend/MERGE
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@ -1,4 +1,4 @@
c02de8ca63f52a2475ce8645edee3203a3c908ac
d1f90c9b77baca5c33a398ab844fb4440c6a5ee7
The first line of this file holds the git revision number of the last
merge done from the gofrontend repository.

22
libgo/go/syscall/libcall_aix.go
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@ -111,6 +111,28 @@ func Reboot(how int) (err error) {
//sys Fchownat(dirfd int, path string, uid int, gid int, flags int) (err error)
//fchownat(dirfd _C_int, path *byte, owner Uid_t, group Gid_t, flags _C_int) _C_int
// On AIX, there is no flock() system call, we emulate it.
func Flock(fd int, op int) (err error) {
lk := &Flock_t{}
if (op & LOCK_UN) != 0 {
lk.Type = F_UNLCK
} else if (op & LOCK_EX) != 0 {
lk.Type = F_WRLCK
} else if (op & LOCK_SH) != 0 {
lk.Type = F_RDLCK
} else {
return nil
}
if (op & LOCK_NB) != 0 {
err = FcntlFlock(uintptr(fd), F_SETLK, lk)
if err != nil && (err == EAGAIN || err == EACCES) {
return EWOULDBLOCK
}
return err
}
return FcntlFlock(uintptr(fd), F_SETLKW, lk)
}
//sys Fstatfs(fd int, buf *Statfs_t) (err error)
//fstatfs64(fd _C_int, buf *Statfs_t) _C_int