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More fcntl() commands supported
+95
+78
src/libSystem/kernel-bsd/fcntl.cpp
+78
src/libSystem/kernel-bsd/fcntl.cpp
···
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((char*) arg)[rv] = 0;
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return 0;
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}
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+
case DARWIN_F_PREALLOCATE:
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{
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__darwin_fallocate* fa = static_cast<__darwin_fallocate*>(arg);
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fa->allocated = 0;
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+
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// We disregard fa->flags, it's not supported on Linux
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if (fa->mode == DARWIN_F_PEOFPOSMODE) // like SEEK_END
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{
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struct stat st;
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if (fstat(fd, &st) == -1)
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{
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errnoOut();
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return -1;
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}
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fa->offset += st.st_size;
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}
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else if (fa->mode == DARWIN_F_VOLPOSMODE) // like SEEK_CUR
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{
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fa->offset += lseek(fd, 0, SEEK_CUR);
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}
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else
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{
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errno = DARWIN_EINVAL;
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return -1;
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}
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+
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int err = posix_fallocate(fd, fa->offset, fa->length);
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if (err) // doesn't use errno!
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{
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errno = errnoLinuxToDarwin(err);
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return -1;
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}
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else
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{
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fa->allocated = fa->length;
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return 0;
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}
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}
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case DARWIN_F_SETSIZE:
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{
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uint64_t size = uint64_t(arg);
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// Not identical to what F_SETSIZE is supposed to do
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// but it's the best we can do.
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if (ftruncate(fd, size) == -1)
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{
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errnoOut();
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return -1;
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}
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return 0;
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+
}
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case DARWIN_F_RDADVISE:
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{
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const __darwin_rdadvise* adv = static_cast<__darwin_rdadvise*>(arg);
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int err = posix_fadvise(fd, adv->offset, adv->count, POSIX_FADV_WILLNEED);
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if (err) // doesn't use errno!
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{
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errno = errnoLinuxToDarwin(err);
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return -1;
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}
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else
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return 0;
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+
}
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case DARWIN_F_RDAHEAD:
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{
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int advice = (arg) ? POSIX_FADV_NORMAL : POSIX_FADV_RANDOM;
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int err = posix_fadvise(fd, 0, 1, advice); // on Linux, the offset and length doesn't matter for these advices
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if (err) // doesn't use errno!
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{
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errno = errnoLinuxToDarwin(err);
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return -1;
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}
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else
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return 0;
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+
}
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// TODO: other values
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default:
+17
src/libSystem/kernel-bsd/fcntl.h
+17
src/libSystem/kernel-bsd/fcntl.h
···
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#define DARWIN_F_UNLCK 2
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#define DARWIN_F_WRLCK 3
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+
#define DARWIN_F_PEOFPOSMODE 3
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+
#define DARWIN_F_VOLPOSMODE 4
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+
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struct __darwin_flock
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{
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int64_t l_start;
···
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pid_t l_pid;
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short l_type;
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short l_whence;
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+
};
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+
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+
struct __darwin_fallocate
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{
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uint32_t flags;
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int mode;
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uint64_t offset, length;
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uint64_t allocated;
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+
};
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+
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+
struct __darwin_rdadvise
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{
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uint64_t offset;
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+
int count;
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55
};
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#ifdef __cplusplus